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chamfer size wrong

Message 1 of 11
202 Views, 10 Replies

chamfer size wrong

I have been scrapping parts nonstop for months because the chamfer sizes are wrong.

Attached is pic of latest part.


cut in same setup with same cutter without a tool change

both chamfers programed as 2d contour .03 chamfer width .13 tip offset  .375 cutter dia with 45 angle

the outside chamfer measures .090 and the inside is close to .03 BUT offset down in Z maybe .045 +/-

why are the 2 chamfers different?  why are they both wrong different ways?

the simulation looks good but the part is scrap


thanks for your thoughts



Message 2 of 11
in reply to: mmharris

What is the actual tool part number, do you have a manufacturer link to the item?


Would you be able to share your Fusion file here?
File > Export > Save to local folder, return to thread and attach the .f3d/.f3z file in your reply.


What machine and control are you using?

Seth Madore
Customer Advocacy Manager - Manufacturing
Message 3 of 11
in reply to: mmharris

Thanks but design is confidential .

The cutter is a plane 45 degree per side chamfer mill.

The chamfer should be the same on both sides and isn't.

Message 4 of 11
in reply to: mmharris


You haven't mentioned what machine/controller your using.


Looking at the picture it looks like either the part is moving or the tool is moving to cause that sort of error.


I've machined thousands of chamfers In fusion using 2D contour and 2D chamfer and never had an issue like what you have in your picture.


Without looking at the file and/ or posted code we're just guessing if its a Fusion issue(unlikely) or something else


You can share your part privately to Seth in a DM if you wish to keep it confidential.


Message 5 of 11
in reply to: mmharris



I agree with @a.laasW8M6T, there is something odd going on, may be the way that you are creating/selecting the Chamfers on your Model.

Yes, you can send the f3d file to @seth.madore as he has an NDA, I also have one so you could also send it to me if you wish 🙂 🙂

Message 6 of 11
in reply to: mmharris

@mmharris could you drop me an email with the file so we can examine the issue in a confidential manner?
Email: seth DOT madore AT autodesk DOT com


Seth Madore
Customer Advocacy Manager - Manufacturing
Message 7 of 11

I place my bet on Modelled chamfer vs non modelled chamfer. 

If you chamfer is modelled then you need to set the chamfer width to 0 as its already there. 
If its a sharp edge you want to chamfer then you can type in the chamfer width. 

Also if it is modelled are you choosing the top or bottom contour? 

Can you add a screenshot showing the contour selection in the 2D chamfer toolpath dialog, of course only revealing as much of the part geometry that you have already done in the first photo. 

However Id expect the simulation to show this as being incorrect, so tool length or tool definition may also be contributing. But selected contours is my gut feeling without seeing the CAD/CAM.

Richard Stubley
Manager - Manufacturing Specialist Team
Message 8 of 11

^^^^ this ^^^^

Seth Madore
Customer Advocacy Manager - Manufacturing
Message 9 of 11
in reply to: seth.madore

thank you all

still think the software has merit in spite of all the challenges


IE:  trying to export/ translate the file locked up my pc twice today

also F360 and the forum were down earlier today

Should I be considering a new pc even though everything but f360 works well?

poor internet speed is also an issue


evidently I successfully exported it as an igs even though i was trying to export as 

a native f360 file .. not sure what happened there

will try again later


I will also continue from a sharp edge using 2d contour, chamfer size and tip offset.

If the results remain unsatisfactory will also try from a modeled chamfer ...

unfortunately modeling a chamfer at this late juncture loses reference geometry used in earlier operations

and requires repicking the same geometry = extra time and mouse clicks

which invites more issues     

keep it simple.

thanks again






Message 10 of 11
in reply to: mmharris

Hmm. Looking at the iges file you sent me, it looks nothing like the part that you show in your first screenshot. Are there multiple components in the original file?



For simple deburring and specific chamfer size machining, I prefer to just start with a sharp edge on the model and specify everything properly in the toolpath.

Seth Madore
Customer Advocacy Manager - Manufacturing
Message 11 of 11
in reply to: mmharris

And instead of exporting the file, you could also just right click on the file in the data panel and select "Share Link" and email me or DM me that link (make sure it's set to "Allow Download")

Seth Madore
Customer Advocacy Manager - Manufacturing

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