222033076-GdT-Pcdmis-Training-Manual-Issue-1.pdf
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GD & T PCDMIS Training Manual
INDEX Chapter 1. Course Introduction ……………………………………….. Introduction Hexagon quality assurance documentation Agenda Course objectives 2. Datum Definitions…………………………………………………… Primary Datum Secondary Datum Tertiary Datum 3. Tolerancing with PCDMIS……………………………………………… GD & T Dialog box Feature Control Frame How to apply a Tolerance 4. Form Tolerances……………………………………………… Circularity Straightness Flatness Cylindricity 5. Location Tolerances…………………………………………… Location Regardless of Feature size Maximum Material Condition Concentricity/Coaxiality Symmetry 6. Orientation Tolerances………………………………………………………. Parallelism Perpendicularity Angularity 7. Profile Tolerances…………………………………………. Profile of a line Profile of a surface 8. Runout Tolerances………………………………………….. Circular Runout Total Runout 9. Appendix Set up options ………………………………… Tolerancing Feature Control frame Location True position Profile GD & T Advanced Tab Composite Tolerances
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Course Introduction
IN THIS CHAPTER
· · · ·
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Introduction Hexagon quality assurance documentation Agenda Course objectives
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Introduction to PCDMIS GD & T Training Course Welcome to Hexagon Metrology Hexagon metrology welcomes you today to their metrology facility and hopes that your visit will be enjoyable, interesting and informative. During the introduction session we respectively request that you take note of any health and safety requirements and that you complete the Hexagon Metrology quality assurance documentation. The information provided will contribute to future development of both existing and new training courses.
Introduction Overview · Welcome · Introduction to Hexagon Metrology · Health & Safety · Course subsistence arrangements · Course Content and Times · Trainee registration and background · Training manual contents · Workbook principals · Evaluation · Certification · Further courses
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Course Agenda Please see the following overview of the course agenda GD & T with PCDMIS
Ø Ø Ø Ø Ø Ø Ø
Datum Reference Systems Form Location Orientation Runout Profile
Please note: Course content and order is subject to change at the discretion of the Training Instructor
Course Objectives To achieve a Basic understanding of Geometric Dimensioning and Tolerancing (GD & T) with PCDMIS in the following areas: · · · · · ·
Datum Systems Form Location Orientation Runout Profile
Training Manual and workbook Each trainee will be provided with a training manual and workbook covering different aspects of the level 1 course only What this training manual is! The training manual is provided as a reminder to each student of the important requirements that lead to the successful implementation of GD & T functions with PCDMIS. It provides basic examples and techniques on the GD & T functions of PC DMIS. What this training manual is not! It is not another version of the technical manual. What is the workbook? The workbook provides evidence of competence achieved by each trainee during the training course. It will include exercises to check that learning has taken place not only in the use of the tolerancing on the CMM but also the knowledge and understanding gained.
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Evaluation As we all know evaluation is very important. The workbook will provide a method of evaluating each trainee’s competence and give the trainee evidence to take back for themselves and their employer of their achievements during the course. Based on the results obtained and evaluated by your training instructor, a certificate will be issued. The assessment of competence can only be judged at the time of the course. This does not mean that the trainee can be classed as an expert, it is important for the trainees to implement the techniques they have learned on their return to their respective company. Course evaluation Hexagon metrology takes pride in the services it provides and continues to strive to improve this quality service. It is important for us to get feedback about our services. As part of this process, we will kindly request that on completion of your course you complete a training evaluation form. During each session of the course the students will be encouraged to participate in both the theoretical and practical elements. Questions and answers sessions for the above elements and any other requirements will be included as requested.
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Datum Definitions IN THIS CHAPTER Datum reference system
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Datum Reference System (Alignment/Coordinate system) Knowledge of component alignments is a requirement to successfully achieve the datum reference system requirements of Geometric dimensioning and tolerancing (GD & T) The Primary Datum can be defined by a minimum of 3 point contact on a surface or by the generation of a 3D Axis through a minimum of 2 features. (LEVEL) The Secondary Datum can be defined from a minimum of 2 points, of an edge or through an axis relative to the Primary datum (ROTATE) The Tertiary Datum can be defined by a minimum of one point in relation to the Primary and secondary datum’s (ORIGIN)
Note; The above is achieved by the successful implementation of the alignment routines available within PCDMIS as previously shown and assessed on both the PCDMIS Level 1 and Level 2 courses
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Tolerancing with PCDMIS IN THIS CHAPTER
Ø Ø Ø
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GD & T Dialog box Feature Control Frame How to apply a Tolerance
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GD&T Dialog Box Feature Control Frame tab The Feature Control Frame tab gives helps you construct a Feature Control Frame (FCF). It provides you with the tools to define datum features, select the features used in the FCF dimension, an editor to define the specific symbols, tolerances, and datum’s used in your FCF, and a preview area to see the current state of the FCF as you build it. For information on the various items in this tab, see the list of controls below: ID – This box displays the name for the FCF. You can edit it if you want something different. Features – This list displays available features for the particular FCF type. Some features may exist in the part program, but are not available to the feature control frame. For example, a plane feature is not available to Circularity. PCDMIS updates this list after you select the first feature. This ensures that when you create a pattern of features for the FCF, those features are compatible features. Datum’s – The shows all the datum’s defined with DATDEF commands. It only lists datum features above the current cursor position in the Edit window. Leader Lines – This list shows the same features that you selected from the Features list. Each feature has a check box associated with it. When you select a check box, PCDMIS draws a leader line in the Graphics Display window from the FCF to that feature. By default, PCDMIS initially displays all possible leader lines, but you can clear check boxes to turn off leader lines as well. Feature Control Frame Editor – This area lets you apply changes to the FCF. You can select fields with the mouse or by pressing TAB and then ENTER to place the field into edit mode. If the field is editable, it will either display a dropdown list of available options, or it will display a box into which you can type text. When finished editing a field, press ENTER, TAB, or click on a different field to exit the edit mode. Pressing SHIFT + TAB will move backwards to the previous field. When a field is empty a short description is displayed with brackets around it for identification. These descriptions correspond to these fields: Ø Ø Ø Ø Ø Ø Ø Ø Ø Ø Ø
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Material condition Diameter Dimension or feature control frame type Projected zone Number of features Nominal of feature size Plus tolerance Minus tolerance Tolerance Datum Dimension symbol
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Ø Ø
Note field in the first line Optional design notes in the last line
Planar Zone This button appears in the Feature Control Frame Editor area of this tab, if you have a True Position FCF and the tolerance zone is set to a planar zone. To enable this button, select the diameter symbol from the FCF editor and set it to blank as shown here: Once the Planar Zone button appears, you can click it to open the Planar Zone Direction dialog box. The Planar Zone Direction dialog box lets you specify the direction vector for the planar zone in one of two ways: Ø
Ø
Select the Axis option. Then from the Axis list, select an axis from the list: X, Y, or Z. Select the Vector option. Then in the I, J, and K boxes, type the direction vector.
Datum Definitions – This button provides you with easy access to the Datum Definitions dialog box, allowing you to define datums for your current FCF dimension. Feature Control Frame Options – This area contains the Composite check box. This check box controls whether or not the primary dimension row and secondary dimension row should use the same symbol in a single merged cell that spans both rows. (See Appendix) If you clear the check box, the primary and secondary rows display with separate symbols, even if the symbol represents the same thing. Actions and Procedures – This section displays hints and instructions to assist you in building valid FCFs. Preview – This section displays a preview of the FCF with the current settings. It will not include any of the empty fields or empty descriptions that appear in the Feature Control Frame Editor section, for example fields that have brackets, such as “”. Notes on the Feature Control Frame Editor In the Feature Control Frame Editor area be aware that some of the icon fields, if they are not supported will not appear for certain dimensions. For example, if you have Circularity dimension, PCDMIS displays the tolerance field, but hides any datum or modifier fields. Form dimensions (Circularity, Straightness, Cylindricity, Flatness) These don't support datum’s or modifies, so these fields will not appear. Profile in some cases will fall in this category when checking for "Form only". But "Form and Location" for Profile dimensions allows the display of modifiers.
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Orientation dimensions (Parallelism, Perpendicularity, Angularity, Runout, Concentricity, Coaxiality) These allow datum’s and modifiers. Position dimensions (True Position, Profile with Form and Location) These allow datum’s and modifiers. Other dimensions (Distance and Angle Between) These don't allow datum’s. Symmetry is a lot like the form dimensions, and doesn't use datum’s Also, only these dimensions can have multiple lines in the editor: · · ·
True Position Parallelism Perpendicularity
How to apply a tolerance to a feature To apply a tolerance to a feature the options are available in PCDMIS through the dimension section. Firstly measure the feature, then choose the tolerance function required. Let’s look at an example of tolerancing a circle in the Z plus working plane for is diameter and location Measure the circle with the numbers of hits required Insert – dimension location Tick the boxes X, Y, D Input the tolerance, 0.100 Plus 0.100 Minus 0.100 The minus sign is only used if the output in the dimension parameters is changed to signed Create Close The nominal values would now require to be entered in the edit window for each dimension if the circle is measured directly on the component. If the nominal data is obtained prior to measurement using autofeatures or CAD then the nominal values should be already set
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Form Tolerances
IN THIS CHAPTER
Ø Ø Ø Ø
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Circularity Straightness Flatness Cylindricity
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Circularity Circularity also known as Roundness — in this example the shape of the diameter to be produced and measured should be round within a tolerance zone of 0.025 The tolerance is specified by a zone bounded by two concentric circles
0.025
If legacy dimensioning is activated then figure 1 will appear ready for the tolerance requirements to be inserted. Alternatively if legacy dimensioning is not active then figure 2 will appear ready for the tolerance requirements to be inserted
Figure 1 Ø Measure required circle feature Ø Select Circularity from the dimension section Ø Select feature (cir1) (1) Ø Change feature label if required (2) (datum diameter) Ø Insert tolerance (3) (0.025) Ø Set outputs with advanced tab (See appendix for full details) Ø Create
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Figure 2
3 1
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Straightness Straightness can be defined as the maximum allowable deviation away from a straight line or axis within the tolerance zone
Ø Measure required Line feature Ø Select Straightness from the dimension section Ø Select feature (lin1) Ø Insert required tolerance (0.1) Ø Change label(optional) (Angled Edge) Ø Create
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Flatness Flatness can be defined as the maximum allowable deviation on a surface within the tolerance zone
Ø Ø Ø Ø Ø Ø
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Measure required Plane feature Select Flatness from the dimension section Select feature (pln1) Insert required tolerance (0.1) Change label(optional) Create
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Cylindricity Cylindricity can be defined as the maximum allowable deviation of all points on a surface of revolution equi distant from a common axis within the a tolerance zone defined by two cylinders 0.025 0.010
Ø Measure required Cylinder feature Ø Select Cylindricity from the dimension section Ø Select feature (cyl1) Ø Insert required tolerance (0.1) Ø Change label(optional) Ø Create
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Form Tolerances applied as feature control frames to the graphical window
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Location Tolerances (True Position)
IN THIS CHAPTER
True Position Ø Regardless of Feature size Ø Maximum Material Condition Ø Concentricity/Coaxiality Ø Symmetry
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True Position Location tolerances are also known as true positional tolerances. Either defined as a cylindrical zone or parallelepiped (Boxed/rectangular)
Ø Measure required Circle feature
Regardless of feature size (RFS) Ø Select True position from the dimension section Ø Select Datum definition option and define required datum’s A,B,C
Ø Select feature (cir1) Ø Insert required tolerance (0.25) Ø Insert diameter tolerance (15.000 ± 0.025) Ø Insert cylindrical zone modifier Ø Select datum’s ABC Ø Change label(optional) Ø Create
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MMC on actual feature Ø Repeat previous RFS process and select ‘M’ modifier next to tolerance
MMC on Datum feature Ø Repeat previous RFS process and select ‘M’ modifier next to Datum ‘C’
MMC on both Actual and Datum features Ø Repeat previous RFS process and select ‘M’ modifier next to tolerance and next to Datum ‘C’
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True Position tolerances applied as feature control frames to the graphical window
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Concentricity or Coaxiality PCDMIS uses different symbols to define Concentricity and Coaxiality. All sectional features taken are defined as being common to the datum axis feature. As a simple explanation of the difference consider the geometric elements circle and cylinder, these can be defined as two dimensional and three dimensional features. Ø Measure required Circle or Cylinder feature or features Ø Select Concentricity or Coaxiality from the dimension section Ø Select Datum definition option and define required datum’s A,B,C (if not already completed) Ø Select feature (CIR1) Ø Select datum if not main in Primary datum set Ø Insert required tolerance (0.01) (0.025) Ø Select datum C Ø Change label(optional) Ø Create Concentricity
Coaxiality
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Symmetry Symmetry also known the middle off or equal/equal about the centre. In the example the tolerance is applied to the median plane created by the two inside surfaces of the slot to datum ‘A’ created from the median plane of the two out side surfaces
Ø Measure required Line feature or features Ø Select Symmetry from the dimension section Ø Select Datum definition option and define required datum’s A,B,C (if not already completed) Ø Select feature Ø Select datum if not main in main datum set (Lin5) Ø Insert required tolerance (0.01) Ø Select datum B Ø Change label(optional) Ø Create
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Concentricity and Coaxiality Tolerances applied as feature control frames to the graphical window (orientation tolerances also shown in this view)
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Orientation Tolerances
IN THIS CHAPTER
Ø Ø Ø
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Parallelism Perpendicularity Angularity
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Parallelism Parallelism can be defined in many ways whether applied to an axis or a surface 0.200
Ø Measure required feature or features (lines in this example)
Ø Select Parallelism from the dimension section Ø Select Datum definition option and define required datum’s A,B,C (if not already completed) Ø Select feature/s (Lin2/Lin1..this order of selection) Ø Select datum if not main in primary datum set Ø Insert required tolerance (0.2) Ø Change label(optional) Ø Create
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Perpendicularity Perpendicularity can be defined in many ways as shown below, whether applied to an axis or a surface Ø Measure required Cylinder feature or features Ø Select Perpendicularity from the dimension section Ø Select Datum definition option and define required datum’s A,B,C (if not already completed) Ø Select feature (Cyl1) Ø Select datum if not main in main datum set Ø Insert required tolerance (0.2) Ø Insert diameter tolerance (15.000 ± 0.025) Ø Select datum A Ø Change label(optional) (Cyl1) Ø Create
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Angularity Angularity is a method of checking the deviation of a surface or an axis at a specified angle Ø Measure required Line feature or features Ø Select Angularity from the dimension section Ø Select Datum definition option and define required datum’s A,B,C (if not already completed) Ø Select feature (Lin2) Ø Select datum if not main in Primary datum set Ø Insert required tolerance (0.2) Ø Insert cylindrical zone modifier Ø Select datum’s AB Ø Change label(optional) (slot edge) Ø Create
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Orientation Tolerances applied as feature control frames to the graphical window (Concentricity and Coaxiality also shown in this image)
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Profile
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IN THIS CHAPTER
Ø Ø
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Profile of a line Profile of a surface
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Profile Profile tolerances fall into two main categories Ø
Profile of a Line
Ø
Profile of a surface
These tolerances are normally applied to irregular or normal edges, surfaces or, arcs. The tolerance can be applied either side of the nominal profile (Bilateral) or to one side (unilateral) only. The uniform boundary can be applied relative to the profile only or alternatively can be applied relative to the datum reference system as well as the profile.
Profile of a Line Ø Measure required Linear Open Scan feature or features Ø Select Profile Of A Line from the dimension section Ø Select Datum definition option and define required datum’s A,B,C (if not already completed) Ø Select feature (SCN1) Ø Select datum if not main in Primary datum set Ø Select Form only or Form and location Ø Insert required tolerance (0.050) Ø Select datum’s ABC (Form and location only) Ø Change label(optional) Ø Create
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Form only and Form and location tolerance options applied within the graphics display window
From Insert Report Command Analysis the option to create an analysis view set with various dimension options is available for insertion into a Report (Use F1 help key in PCDMIS for more information)
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Profile of a Surface Ø Measure required Patch Scan feature or features Ø Select Profile Of A Surface from the dimension section Ø Select Datum definition option and define required datum’s A,B,C (if not already completed) Ø Select feature (SCN2) Ø Select datum if not main in Primary datum set Ø Select Form only or Form and location Ø Insert required tolerance (0.050) Ø Select datum’s ABC (Form and location only) Ø Change label(optional) Ø Create
Form Only
Form and Location
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Form only and Form and location tolerance options applied within the graphics display window
From Insert Report Command Analysis the option to create an analysis view set with various dimension options is available for insertion into a Report (Use F1 help key in PCDMIS for more information)
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Runout Tolerances
IN THIS CHAPTER
Ø Ø
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Circular Runout Total Runout
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Runout Runout is applied to control any circular feature surfaces rotated through 360 degrees. This could apply to a diameter or a surface at any position across that surface of revolution. Circular runout is applied the surface around the datum axis, included within the tolerance are any effects of concentricity and circularity.
Circular Runout Ø Measure required Cylinder feature or features Ø Select Runout Circular from the dimension section Ø Select Datum definition option and define required datum’s A,B,C (if not already completed) Ø Select feature/s (cyl1/cyl2) Ø Select datum if not main in Primary datum set Ø Insert required tolerance (0.050) Ø Select datum D Ø Change label(optional) Ø Create
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Total Runout Total Runout controls the surfaces around the axis of 360 degrees revolution. The difference from runout is that this tolerance is applied across the complete surface as one tolerance. As a composite tolerance total runout includes the effects of circularity, Cylindricity, concentricity Coaxiality Perpendicularity, Parallelism, and Flatness Total runout applied to a Plane surface around an axis of revolution
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Plane to Cylinder Ø Measure required Cylinder and plane features Ø Select Runout – Total Runout from the dimension section Ø Select Datum definition option and define required datum’s A,B,C (if not already completed) Ø Select feature/s (cyl2/pln1) Ø Select datum if not main in Primary datum set Ø Insert required tolerance (0.050) Ø Select datum D(if required) Ø Change label(optional) Ø Create Cylinder to Cylinder Ø Measure required Cylinder and plane features Ø Select Runout – Total Runout from the dimension section Ø Select Datum definition option and define required datum’s A,B,C (if not already completed) Ø Select feature/s (cyl1/cyl2) Ø Select datum if not main in Primary datum set Ø Insert required tolerance (0.050) Ø Select datum D(if required) Ø Change label(optional) Ø Create
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APPENDIX
IN THIS CHAPTER
Ø Ø Ø Ø Ø Ø Ø Ø
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Set up options Tolerancing Feature Control frame Location True position Profile GD & T Advanced Tab Composite Tolerances
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Setup Options This is located by either selecting Edit – Preferences – Setup Dimension from the main menu or by using the shortcut key F5 – Dimension. These options allow the dimension outputs to be set to the users requirements. Some of the main options include; Ø Ø Ø
Ø Ø
Ø
Decimal places Standard tolerances Positive reporting only(no minus values entered All data reported or errors only Angles in degrees minute seconds or degrees decimal Polar angular output as 0360 or 0 180
The dimension can also be set to automatically be created.
This dialog box provides you with several options that allow you to determine whether or not PC DMIS automatically dimensions features immediately after creating them and how it should create those dimensions.
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Tolerancing The tolerancing options in PCDMIS can be of many different types. The tolerances can be standard bilateral values or alternatively unilateral values including the implementation of geometric tolerancing. It is also possible to use the limits and fits options where interference, clearance or transition fit requirements are stated on the technical drawing or CAD model. All these options are available through the dimensioning menu located from the insert column on the main PCDMIS screen.
Adding Dimensions Overview Dimensions Once a feature or series of features has been measured, it will be necessary to dimension them and apply nominal and tolerance information. Features can be dimensioned just after they are measured or later in the program, the choice is yours. Whenever you wish to access the dimension function, select Dimension from the main menu. A drop down list appears containing the available options. Select the relevant dimension type and a dialog box will appear containing the various options available for that dimension. There are various options which are common to all of the dimension types, we will use the Location option as our example when discussing these. The dialog box contains all of the options related to the particular dimension, including which axes to display, which tolerance to apply and where to send the data once it is calculated. The dialog box is broken down into individual elements or frames which contain related options, to select an option click in the check box next to the option. The ID box displays the dimension ID that will be assigned to the reported dimension. The Search ID box allows you to look for a particular feature in the feature list. The Select Last # box allows you to select the last "n" features as the features to be reported. 45
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The Units option allows you to report dimensions in the units of choice, whichever Units are selected at the time that Create is clicked will be the units applied to that dimension. This option therefore allows you to mix and match the reported units of measurement. The Feature List located at the left side of the dialog box allows you to select the feature or features that will be reported. Once a feature has been selected, the Axes option allows you to select which axis or axes are to be reported. The Tolerances option will change depending on the type of dimension selected, but this is where the amount of tolerance to be applied is input. The Dimension Info option allows you to modify the individual elements of a graphical report which is attached to the feature as shown on the screen. This display can be edited using the Edit button. The Output To option allows you to define where to send the reported information. The Analysis option allows you to select the type of analysis to be performed on the reported data. The remaining options are specific to the Dimension type selected and are discussed there.
Location What is a Location Tolerance?
A location tolerance is also known as plus minus tolerancing or limit tolerancing. It involves defining the features nominal size and position along with a positive tolerance and or a negative tolerance. This method gives a square or rectangular tolerance zone as opposed to the True Position method which gives a circular tolerance zone.
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To access the Location option select Insert, Dimension from the main menu and then select Location from the drop down list of options.
This will display the Feature Location dialog box shown below which is where the various options for the reported dimension are selected.
As the Location option is used for various feature types, there are several output options included in the dialog box to make it conform to the various standards around the world. For a basic Location dimension the following steps are required 1. Assign a dimension name or accept the default ID. 2. Select the features to which the dimension will be applied by highlighting them in the Feature List. 3. Check the axes to be reported in the Axes options by clicking on the box next to the required axis or axes. 4. If the tolerance is the same for all axes, make sure that ALL is selected in the Tolerances option and enter a value for the plus and minus tolerances. 5. Decide which Units the dimension will be reported in, Inches or Millimetres. 6. Decide where you want the output to be sent to by selecting the appropriate option in the Output To options. 7. Click on the Create button to generate the report. The Sheet Metal Axes options allow you to add addition outputs to your report which are peculiar to sheet metal applications. The Location Options add further outputs when dealing with Vector Points, Surface Points and Edge Points. Some European applications require that the ISO Limits and Fits be incorporated into the location calculation and so this option is included.
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True Position input options If within the Insert – Dimension section, the use legacy dimensions option is activated then figure 3 is the menu screen for true position and all other dimensions; if inactive then the menu screen is as shown in figure 2
Figure 3
Figure 4
Figure 1
Figure 2
When using this option to create a feature control frame, set up the datum’s via the datum definitions button in the dimension menu or in this window before selecting the required tolerances. In this example Datum A (plane) Datum B (Line) Datum C (Circle)
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Dimensioning a profile The profile's Surface option computes the threedimensional profile error of a surface or curve feature Insert Dimension Profile – Surface The profile's Line menu option computes the twodimensional profile error of a curve Insert Dimension Profile Line
Profile of a line
Feature Control Frame
Legacy Dimensioning Edge profile= PROFILE OF LINE OF SET LINEAROPEN FORMONLY LEAST SQUARES ABOUT ZPLUS UNITS=MM ,$ GRAPH=ON TEXT=OFF MULT=50.00 OUTPUT=BOTH AX NOMINAL MEAS +TOL TOL DEV OUTTOL M 0.000 0.000 0.050 0.000 0.000 0.000 #
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GD&T Dialog Box Advanced tab The Advanced tab provides you with the ability to set output and analysis options for your Feature Control Frame (FCF) dimensions. For documentation on this tab, see the list of dialog box items discussed below. Also, note that much of this functionality already exists in the legacy dimensions Output Area The Report and Statistics list allows the feature control frame output to be printed to either the inspection report or to statistical files used by statistics software (such as DataPage), to both of these, or to none at all. Ø Ø Ø Ø
Statistics – sends output to statistical files Report – sends output to inspection report Both – sends output to both inspection report and statistical files None – doesn’t send output anywhere
When PCDMIS executes a FCF command, the output will go to the inspection report, the stats file, both of these, or none of them, depending on what you selected. Note: If either the Stats option or the Both option is selected, a preceding STATS/ON command must exist inside the Edit window for the FCF to be sent to the stats file. The Units list allows you to determine the units of measurement your FCF should use. You can choose between these options: Ø Ø
Inch = Inches MM = Millimetres
PCDMIS uses the selected unit of measurement for dimensioning as long as the dialog box remains open. By default, PCDMIS uses the same unit of measurement used by the current part program. Analysis area This area sets the dimensional output analysis format for the FCF.
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Report Textual Analysis When you select on (or Both for True Position FCFs), PCDMIS will print out the following in the standard inspection report and the Report window for each individual hit used in the FCF: Measured X, Y, and Z values Measured I, J, and K values Ø Deviation of each individual hit Ø “MAX” or “MIN” marker at the end of the line whenever the hit produces either a maximum or minimum deviation. Ø Ø
Report Graphical Analysis This list displays the output for the FCF in your report. It uses a format suitable for close examination. When you select On (or Both), PC DMIS will display, in a graphical format that uses coloured arrows, the deviation of each individual hit for the FCF used on the part in the report. These arrows, with their colours and directions, indicate the relative size of the error, as well as its direction. CAD Graphical Analysis This list works the same as the Report Graphical Analysis list, except that it displays the graphical analysis inside the Graphics Display window. Arrow Multiplier The Multiplier box let you set a scaling factor that magnifies the deviation arrows and tolerance zone for the CAD Graphical Analysis mode. If you type a 2.0 value, PCDMIS will scale the arrows two times the calculated deviation for each feature hit. The Multiplier box is used for viewing purposes only, and is not reflected in the text printout. Dimension Info area This area lets you create a Dimension Info text box for the FCF. When you select the Create Dimension Info when this dialog closes check box, PCDMIS enables the Edit button. You can click the Edit button to open up a dialog box that lets you set default options for the Dimension Info command (DIMINFO). See “Edit Default Dimension Info” for more information. When you create your FCF, the dialog box closes and PCDMIS creates a DIMINFO command in the Edit window after the FCF. This DIMINFO command displays all dimension information in the Graphics Display window next to the feature selected from the Feature list in the Feature Control Frame tab. It also displays the same available dimension axes used in the Edit window for that particular FCF. True Position area This area become available only when creating a True Position FCF. For other FCF types it remains greyed out. It contains these items: Alignment Sometimes when you view dimension information relative to the current alignment, the calculations of the datum’s can sometimes be hard to decipher. This list lets you determine how this information should get displayed: relative to a particular alignment or relative to the datum reference frame. Fit to Datum’s This check box determines whether or not the FCF uses a best fit calculation to find the optimal position of the datum reference frame that minimizes the error.
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Nominals and Axes This portion lets you customize the output by controlling which axes PCDMIS should display in the report and allowing you to manually type the nominal values.
Feature List The list to the left of the Nominals and Axes columns displays all the features used in the True Position FCF. Select a Feature Set or feature from this list. PCDMIS then displays the possible axes for that feature. Report Axis This column contains check boxes for each axis. A selected check box sends that axis to the report. Axis This column lists available axes for the selected feature. Nominal This column contains nominal values. You can overwrite them by clicking on them and typing different values. +Tol / Tol The plus and minus tolerance columns provide fields into which you can type tolerances for the various axes used in your FCF. PCDMIS only applies these tolerance values to axes that relate to size, since the axes that control position use the main tolerance in the FCF. Update Feature Nominal This column lets you specify whether or not any changes you made to the nominal values should get applied not only to the FCF but to the feature as well.
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GD & T PCDMIS – Issue 1 – May 2006
Composite Tolerance for True position Within PCDMIS the option to apply a composite tolerance is available. From Figure 5 you can see that there are two tolerances to be applied.
Figure 5
In Figure 6 it is possible to combine the symbol to two different tolerances thus creating a composite tolerance (select composite feature control frame option). The top tolerance option is to apply the true position in the normal way to ABC, the lower tolerance option allows for the fitting of the group of features as a pattern or feature set to that tolerance
Figure 6
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GD & T PCDMIS – Issue 1 – May 2006
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GD & T PCDMIS – Issue 1 – May 2006
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