Problem found with Threading Tool and Hole Tool Chamfering Threads in free version

[jle2199]

I have been having a problem with the Hole Function in Solid.

When I ask 360 to make a threaded hole with a chamfer on it, the chamfer does not leave a leading thread for the threads to begin.

The instructor struggles with it in the attached video, and does not realize that the problem he has, the "chamfer colliding with the threads" is actually proper, and not what he changes it to, as what he changes it to does not allow for a male thread to mate. 

This also happens with male threads and you get a... Excuse me I lack a better description,  "glans" on the ends of your male threaded parts.

https://youtu.be/AfeCRrYsAys?t=400

[seth.madore]

This isn't a problem for just the free version..

[HughesTooling · Accepted solution]

This is a known bug in all versions of Fusion, don't add the chamfer as part of the hole feature. The trick is first create the threaded hole with the Modeled option unchecked, add the chamfer as a second feature then go back,

and edit the hole feature and check the modeled option.

Mark

[seth.madore]

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@HughesTooling wrote:

This is a known bug in all versions of Fusion, don't add the chamfer as part of the hole feature. The trick is first create the threaded hole with the Modeled option unchecked, add the chamfer as a second feature then go back and edit the hole feature and check the modeled option.

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That's such a mess of a workaround to get something that's modeled correctly. I wonder who we could talk to to get this improved upon. @jeff_strater @Phil.E any thoughts?

[HughesTooling]

@seth.madore Yes not good and will not work with BSP threads because the form has fillets and no part of the hole cylinder remains after the thread is added. The problem's been reported years ago, think I reported it on the old ideastation in 2015! Because someone came up with this workaround it got marked as implemented even though I pointed out it didn't work on Whitworth thread.

Also complained when the hole wizard was first implemented because it just doesn't work if you chamfer a threaded hole.

Edit. My ideastation post from 2015!

Mark 

[jle2199]

I absolutely agree that the hard way is not a solution. 

Paying 500 dollars to have this as an option is almost unacceptable.

You've been around for at least 35 years, AutoDesk, I get needing to profit, but there are basic options you should reconsider.

I'd pay $100 a year for a home user to have full access for someone that makes under $10,000/year using your product, but you're really asking too much at $1000/year owing $500/, year. I occasionally need your product to make a $0.0009 angle change, how do I report it? 

[jeff_strater]

Sorry, but I have to ask:  What is the purpose of the Chamfer here?  Is it for a countersink?  Why not use the Countersink hole type for this?

[jle2199]

This is using the countersink hole type with a thread.

This also happens when you have it chamfer the end of a threaded rod in the
thread tool.

[TheCADWhisperer]

@jeff_strater

Using Countersink hole does not result in the correct geometry. Thread does not exit the geometry as demonstrated by @HughesTooling and therefore fastener cannot be screwed into the thread. 
This has been demonstrated here almost every month since the beginning.

[HughesTooling]

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@jeff_strater wrote:

Sorry, but I have to ask:  What is the purpose of the Chamfer here?  Is it for a countersink?  Why not use the Countersink hole type for this?

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@jeff_strater Your picture of the modeled thread shows the problem perfectly! 

Here's my version adding the chamfer as a feature after the hole and thread are created, note the thread runs out through the chamfer.

And if you add a chamfer as part of the hole feature in your example.

The workaround I used is OK but not that discoverable and doesn't work on whitworth threads. Also probably messes up hole callouts in drawings.

Thanks Mark

[seth.madore]

If you use Modeled Threads and define a countersink value, you will NOT be able to 3D print a part and assemble it (tolerances and printing accuracy aside). The mating part will simply not thread thru, as the countersink just offsets the thread, not actually cutting it.

Revolved chamfer:

Thread with countersink defined:

 

 

 

[jle2199]

Now that I can see your pictures, you are having the exact same problem doing it your way, there isn't a leading thread. 

[jeff_strater]

ah, OK, got it.  Thanks for the clarification.

[Phil.E]

I added a new ticket for this, and just to be clear, the thread must run out into the chamfer zone, right?

[seth.madore]

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@Phil.E wrote:

..to be clear, the thread must run out into the chamfer zone, right?

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Yes, and taper off into nothingness

[jle2199]

The chamfer should cut the thread as so it leaves a partial thread where the chamfer is cut.  This creates a leading thread, or threads, in the chamfer, allowing the mating piece, which might also have a chamfer on the end, that would need a leading thread or threads in it, to allow mating.

Inversely, when you draw a round piece, chamfer the end, and then thread the rod, the *thread ends at the bottom of chamfer* and *does not continue* to the end of the rod creating a leading thread.

If Autodesk has a 3D printer, it might help to print a few mating pieces to see what happens if the resulting problem is unclear.

[Phil.E]

Thanks for the additional details. Would it make sense for the thread command to include a chamfer setting for rods and holes?

Have you noticed that a rod can be chamfered after the thread. Is this an appropriate outcome?

[jle2199]

That's how I currently do it.

It's acceptable to a point, you can't always get the correct edge and sometimes need to select multiple edges.

I usually wind up saying "f**k it" export just the threaded rod to 3DBuilder, cut a cone out of a cone and then use that to cut the chamfer on the threaded rod, and then I import everything to 3DBuilder when it's done and add the threaded rod that I already made in 3DBuilder.

I suppose, now that I know how to sweep a chamfer around a cylinder I could do that.. 

[jle2199]

Honestly, I thought I was the only one that had problems chamfering and threading things until I saw that video and saw him correct what would be right. 

[HughesTooling]

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@jle2199 wrote:

That's how I currently do it.

It's acceptable to a point, you can't always get the correct edge and sometimes need to select multiple edges.

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If you create the thread as a cosmetic thread, add the chamfer the go back and change the thread to modeled it's a lot easier.

Mark