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Bend Modeling

When designing parts with bends where the parts must fit together, it is important to verify, on screen, that parts fit properly, that holes align, etc. The Job | Model Bends command helps you do so by creating a side view drawing of the bends. You can use the side view to:

  • Check fit by sliding parts into place on screen
  • Estimate distances between or heights of bend legs
  • Add tolerance lines to show a desired bend dimension
  • Adjust bend lines positions to achieve a desired bend model

Note that:

  • Actual parts will vary from the model due to: limitations of the model, tolerance of parts before bending, tolerance of bend position, tooling variation, etc. 
  • You should incorporate allowance for these variations in your design (it’s better for pieces to be a bit loose than to not fit at all).
  • You must apply the command again if you change your design or Job | Specifications.
  • The general linear tolerance does not apply on exterior or interior dimensions of the part after bending. If needed you can specify critical dimensions and tolerances on the bend model using Comments to Machinist. For example, you might specify that the distance between legs in a U bend is 1.234" +/- .01. 
  • For metal enclosures consider using File | New | Box which takes into account several details automatically. 
  • The model considers the sheet thickness, bend radius, and the compression and expansion of material that occurs at a bend.

For mating parts, slide the side views on screen (and rotate if needed) to see if parts mate properly. For new or changed complex designs it is recommended to do a short run initially.

case_model.gif (2765 bytes)

Also see Bend Specifications


Some odd or complex shapes can confound the bend model computation.  If the bend model is clearly off, try copying your design to a separate file, simplifying the shape to a simple rectangle and generating the bend model on the simplified shape.

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