how to make an involute curve

[BobM3]

I'm trying create a gear. It would be nice if I could actually make an involute curve. Is it something that has to be done with VBA? Or could I use a spreadsheet and import it into Inventor?

 

[mcgyvr]

Did you try the gear design accelerator already built into Inventor?

or

http://discussion.autodesk.com/foru...=f78&dateRange=all&numResults=15&rankBy=10001

 

[rollupswx]

How accurate is your machining process? You can define an involute curve (spline) for a gear with as few as 5 points that is better than most manufacturing processes can hold on the tolerance. Of course if you don't need a true involute simply used the Wellman's Odontograph form in the Inventor Design Accelerators.

 

[BobM3]

I'm stuck with Version 9. I don't think an accelerator is available but that forum looks good. I'll spend some time looking through those threads.

For now I'm just making assembly drawings and I want the parts to look fairly close to what they are. But you're right - for this just an approximation will work fine.

Thanks to the both of you.

 

[rollupswx]

My memory might be failing but I think DAcc for gears was in Inventor 9. You must be in an assembly file iam and click on the down arrow next to the Assembly Panel.

 

[rollupswx]

If you have access to a Gieseck Technical Drafting book it explains how to use the Wellman's Involute approximation method.