topic Betreff: Issue with Tear tool in sheetmetal in Inventor Forum

Issue with Tear tool in sheetmetal

Anonymous — Tue, 22 Dec 2015 20:27:56 GMT

Hey all,

Does anyone have any advice for help with my issue.

The gap tool is not reaching all the way to the end of my pipe cut off.
here is an image of the problem

I am trying to convert this pipe to sheet metal, so then I can turn it into a drawing, print this out and cut it with scissors, then wrap it round actual pipe and draw the outline with a marker.

File attached.

If anyone can help me, especially before Christmas, would be warmly appreciated.

Regards,
Ben

Betreff: Issue with Tear tool in sheetmetal

WHolzwarth — Tue, 22 Dec 2015 20:51:12 GMT

This could do it. I've changed k-factor a bit more from 0.999 to 1 (Just to let you know).

Double thickening is the main change.

Merry Xmas

Walter

Betreff: Issue with Tear tool in sheetmetal

Anonymous — Tue, 22 Dec 2015 20:55:15 GMT

Thank you!
What is the k_factor? Seems like a complete mystery to me. Im just working on my final university of my bachleours project.

Meryy Christmas!

Betreff: Issue with Tear tool in sheetmetal

Anonymous — Tue, 22 Dec 2015 21:33:30 GMT

And what do you mean by 'double thicking'

Thanks,
Ben

Betreff: Issue with Tear tool in sheetmetal

WHolzwarth — Tue, 22 Dec 2015 22:34:25 GMT

Hi Ben,

k-factor is normally set to 0,44 in Inventor and determines the position of the surface with non length changes in a sheet metal.

Example: For a sheet with 3 mm thickness Inventor places this surface at 0.44*3 = 1.32 mm from the inner surface. Bend region below 1.32 mm get shortened, regions more than 1.32 mm get lengthened. That's because bending is not symmetric, but it additionally depends on bending process and bending machine used.

In your case, you're wrapping a thin sheet of paper round the outside of the tube. Therefore a k-factor of 1 should be used.

The thickening operations (features Thicken1 and Thicken2) are used for getting orthogonal edges in the flat pattern. In return, you're bending a flat sheet, and the result are no angled edges as in your initial shape, but the edges after thickening. These must be done twice - from inside out and from outside in.

Walter