Thread Creation Enhancement

[jrinad70]

I noticed when creating a thread on an external post (I suppose the same issue is true for internal threads) the feature didn't add a chamfer to the edge.  Whenever a thread is created a chamfer exist for lead in of the bolt or nut.  I decided to manually create a chamfer on the edge of the post and then create the thread.  The software added the thread but stopped at the new edge created by the chamfer.  This is no good.  See pics below of thread created with and without a chamfer on edge.  Fusion needs to extend the thread profile out beyond the chamfer.  When a chamfer is present the software should extend on out to the surface and not stop at the edge created by the chamfer.  Maybe Fusion should just have an option to include a chamfer (size input by user) so the user doesn't have to manually create the chamfer prior to creating the thread.

[jrinad70]

Ok I feel stupid now.  If you create the thread first and then the chamfer all is good.  Problem solved.  Just have to remember feature order matters.

[jrinad70]

Ok, now I don't feel stupid.  This is strange.  If you create the thread first you can't create a chamfer second (well you can but you have to select four edges to get it to create one and it's very distorted).  The only way to get it to model correctly is to first create the chamfer.  Then create the thread.  Then move the chamfer in the timeline prior to the thread creation.

This needs fixed.

[HughesTooling]

I made a similar request on the Ideastation and was given the same workaround. The workaround was marked as solution but it doesn't work on threads with rounded profiles like BSP so there is a need for this. The workflow should be chamfer the rod then have an option to extend the thread past the end of the rod.

Here is the idea I requested, it's been move the the design and document forum for some reason.

https://forums.autodesk.com/t5/design-validate-document/thread-chamfer/m-p/5647114/highlight/true#M5...

Mark

[jrinad70]

Thanks for the link and info Mark.  This seems really silly to me.  Hopefully they'll fit it.

[wayne.ward.01]

There is a similar problem with chamfers on female threaded holes. If you put the chamfer first, the thread stops at the chamfer. It's OK for machined parts, but it's not good for 3D printed SLA parts where the fasteners don't fit.

If you add a chamfer after the thread, the chamfer is not correct.

I have to:

- Create a simple drilled hole

- Add the thread

- Create a countersunk hole coaxial with the first hole

This means creating three holes when one feature should do it all. It's not impossible to solve, but it's time-consuming if you have a lot of holes.

[aspagliere]

I had the exact same thing come up recently. I worked around it by revolving a line and splitting the body with that surface. This matches the way I've made this part in a shop: cut the threads, then spin it around on a belt sander.

But it is clearly true that the threading feature needs some work. In fact, I'm going to post an idea for "necking" right now.

[fredgenius]

The best work-around I have found is to create a cylinder, tapered (internal or external, according to need) that overlaps the start of the thread (section analysis is useful here), then combine/cut, exactly like you would do with a physical tool. Would be good if we could specify a lead-in chamfer within the thread feature, would save a lot of extra work.

[david.jascha]

Same issue here: https://forums.autodesk.com/t5/fusion-360-ideastation/chamfer-on-thread/idc-p/9147632

This is so easily programmed, why you not care autodesk?