How To Set Default Tolerance Inventor Drawing

Making the Most of Model Tolerances

30 Jun, 2003

By: Jeff Wymer

Autodesk Inventor'due south model tolerances allow yous to define tolerances at the part level, which controls a model's size based on its tolerances. The model tolerances defined at the model level can be extracted and documented in the cartoon environment automatically. In this column nosotros'll comprehend how to set up model tolerances, update your model to specific tolerances, and document these tolerances at the drawing level.

Getting Started

As shown in Figure i, you lot can apply tolerance settings in the Tolerance dialog box, which is accessible from the Dimension dialog box in model mode or in a cartoon view. You can admission the Tolerance dialog box for feature parameters (such equally extrusion extents or beat thickness) in the Parameters dialog box. You tin can also utilize the Parameters dialog box to quickly review and edit dimension values, feature parameters, and tolerance settings for every model dimension and feature parameter in the unabridged part, as shown in Figure 2.

Figure 1. The Tolerance dialog box allows you to quickly define model toleranes and set the evaluated dimension value to the upper/nominal/lower values

Figure 2. The Parameters dialog box lets you quickly review and edit dimension values, feature parameters, and tolerance settings for every model dimension and feature parameter.

Model Tolerances for Sketch Dimensions

You tin define model tolerances when editing the dimensions of a sketch or role-editing dimensions. When the Edit Dimension dialog box appears, right-click and select Tolerance. The Tolerance dialog box volition now announced. Here yous can set the precision of the tolerance and the tolerance type. Yous can fix how the model evaluates the tolerance (for example, evaluate the dimension to the upper/lower/nominal tolerance value) during model creation or updates. This is useful for simulating what-if design scenarios to understand the bear on of the tolerances on the model and mating components in the assembly.

Model Tolerances for Feature Parameters

Model tolerances tin can be accessed and defined on all feature parameters by accessing the Parameters dialog box from the Tools pulldown and Parameters pick. Here you can right-click the equation from the characteristic parameter'due south equation and cull "Tolerance..." from the context bill of fare. This will access the same tolerance dialog box used when editing dimensions previously defined in Model Tolerances for Sketch Dimensions. Yous tin at present adjust parameter tolerance settings in the dialog box and click OK to contain all of the changes.

In the Parameters dialog box, you can easily specify whether the dimension is evaluated at the positive or negative tolerance setting. Simply select the tolerance cell and a pulldown list will announced, allowing you lot set the specific parameter to the upper/nominal/lower tolerance setting. You tin can also set the entire model to be at its upper/nominal/lower tolerance setting in ane pace by using the Reset Tolerance option in the Parameters dialog box. To review the model at the evaluated sizes for all dimensions and parameters, update the model using the Local Update icon.

Predefining Tolerance Values

A visitor standard usually establishes the allowable tolerance for dimensions. You can set up your company standards every bit defaults in Document Settings, as shown in Figure iii, and specify standard tolerances based on the number of decimal places defined. This tin can be prepare upwardly and saved in a template file for easy access and reuse. To admission it, select the Tools pulldown card and select the Document Settings options and choose the Default Tolerance tab. The Apply Standard Tolerance Value option allows the model to apply the predefined tolerance settings defined in the dialog. If no values are provided (default) y'all can define the tolerances based on the number of decimal places yous enter. To automatically think the tolerances defined during modeling in drawings, apply the Consign Standard Tolerance Values option.

Figure iii. The options in Document Settings are useful for specifying company standards.

When editing the tolerances of the sketch and model dimensions the tolerances will automatically exist set based on the settings predefined in documents settings. This option is only available when using the default tolerance blazon. Whatsoever tolerance blazon setting other than default volition override the predefined settings.

Retrieving Tolerances in Drawings

The tolerances divers at the model level tin can be retrieved automatically in the drawing. This will ensure that there is no miscommunication between designing and documenting. To call back the model tolerances and dimensions, use the Get Model Annotations selection in the drawings. The model dimension and tolerance can exist changed from the drawing by using the edit model dimension and the tolerance choice from editing dimensions. This change is fully associative with the model; therefore, whatsoever changes made at the drawing level volition be reflected at the model level.

Figure 4. Here is a view of the model with tolerances applied and displayed at the part level.

Conclusion

In Autodesk Inventor, you can select standard limits and fits or specify custom tolerance values for sketch dimensions and features. After selecting the type of tolerance and specifying the upper and lower limits, y'all tin can choose whether the evaluated size volition be the Nominal, Upper, or Lower limit. The model can then exist set to the evaluated size to check specific fit conditions or for exporting 3D data with all dimensions set to the appropriate condition for manufacturing (such as nominal for a machined part). You can do what-if blueprint scenarios to clarify the touch of tolerances on you lot designs and make appropriate design changes to decrease costly errors and mistakes during manufacturing and associates.

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