topic Re: Thread Modelling - lead in chamfer in Fusion Design, Validate & Document Forum

Thread Modelling - lead in chamfer

dannyspitz — Tue, 01 Mar 2016 16:00:21 GMT

Hi,

I'm trying to model both exterior and interior threads but have an issue with the lead in and out chamfers. if i model the chamfers (60Deg x 0.5mm) on the surface the thread will not extend throught the chamfer to give a useable thread but if i model the thread surface with square edges to the end of teh thread i end up with a sharp edge with no lead in chamfer which is not standard practice and can lead to a razor sharp edge.

Aany ideas on how to extend the thread "cut" beyond the length of the face as would happen when machining and hence why undercuts are used?

Re: Thread Modelling - lead in chamfer

Anonymous — Tue, 01 Mar 2016 13:21:43 GMT

Thanks Mark,

Tried your method but now having issues with adding the chamfer in the
correct distance and angle direction! Getting frustrated with F360 as simple
stuff that¹s been available on 10 year old ³professional² CAD sw isn¹t
available.

Think I¹ll create a cutting part for the mating partsŠ more time wasted!

Regards,

Danny

Re: Thread Modelling - lead in chamfer

HughesTooling — Tue, 01 Mar 2016 16:16:28 GMT

I've done a couple of tips threads on this, here's the links.

http://forums.autodesk.com/t5/post-your-tips-and-tutorials/chamfer-threaded-rod/td-p/5946660

http://forums.autodesk.com/t5/post-your-tips-and-tutorials/how-to-chamfer-modeled-threaded-holes/td-p/5946552

Mark

Re: Thread Modelling - lead in chamfer

PhilProcarioJr — Tue, 01 Mar 2016 17:16:03 GMT

I have found if you create the chamfer first on the end then add the threads, then drag the chamfer after the thread operation on the timeline it fixes this issue.

Been meaning to bring this up with the devs as really it's a bug but I forgot about it until reading this thread.

Re: Thread Modelling - lead in chamfer

Anonymous — Thu, 27 Oct 2016 05:51:53 GMT

Phil, Your tip works great on a lead-in end chamfer. Thanks! However this method fails when I try to apply it on an undercut chamfer. Please see attached PDF. Btw, both chamfers were defined the same way. Any tips on how to fix this? Thanks!

Re: Thread Modelling - lead in chamfer

PhilProcarioJr — Thu, 27 Oct 2016 10:32:31 GMT

@Anonymous

Like this?

Re: Thread Modelling - lead in chamfer

Anonymous — Sat, 29 Oct 2016 16:31:12 GMT

@PhilProcarioJr

Yes, That's it almost exactly. Thanks! I was modeling a M-F Hex stand-off and I started from the hex body. You're way is much simpler. Much appreciated.

IMHO though, it seems like Fusion not being able to properly handling a chamfer on the end of a thread (without special tricks) is a bit of a bug. But then again, I wouldn't be learning so much without having to learn these tricks so it's all good. Cheers!