SHEET METAL COUNTERSUNK HOLE ISSUE

POC

Hi
The countersink routine does not produce a countersunk feature on my sheetmetal part? it inserts a circular hole If I duplicate the process on a standard extruded shape everything works as expected.
Thanks

john_mcclary

active sheet-metal parts can only have cuts perpendicular to the top face. (anything that can be done on a standard laser table)
you will need to add a "Finish Sheet-Metal" feature in order to cut features like countersinks.
(anything that will happen after the part has been cut from the laser table)

john_mcclary

active sheet-metal parts can only have cuts perpendicular to the top face. (anything that can be done on a standard laser table)
you will need to add a "Finish Sheet-Metal" feature in order to cut features like countersinks.
(anything that will happen after the part has been cut from the laser table)

tony_buxton

Hopefully someone at Onshape realizes that countersinks can be done on a turret punch. Limiting a feature to a particular machine process is a little shortsighted.

I cannot begin to thank the people at Onshape for their work in providing this product. Even if this feature never makes it into a release, the simple fact that this software is so robust and filled with incredible features makes it the go to solution.

NeilCooke

@tony_buxton thanks for your kind words - it's on the list.

owen_sparks

Am I imagining a custom feature existing for punching sheet metal? @MBartlett21

jakeramsley

owen_sparks said:

Am I imagining a custom feature existing for punching sheet metal? @MBartlett21

That would be impressive, but currently I don't think it is possible.  Sheetmetal treats faces almost as if they are infinitely thin, finding where the hole is and then thickening (that's not how it technically does it, but much to the same affect).  

Luke_Milliken

I would also like to see countersinks be possible before "finishing the sheet metal model." Countersink punches on a turret punch are quite common practice in industry. 

At the very least, even if the model required to be finished before adding countersinks, It would be great to have the option of which features to show and which to hide on flat pattern drawings instead of being limited to Onshape's assumptions on manufacturing methods. 

Has anyone came up with a temporary solution for this? I need to get my drawings to fabrication ASAP and this has caused an unexpected road block.

POC

I started this thread - to overcome the issue I had to add a "simple" hole slightly smaller than required in the required locations while in Sheet Metal mode then after "Finishing Sheet Metal" mode I added the correct size Counter sunk hole in the same locations, and had those as a call out on the formed drawing with just hole locations on the flat sheet metal drawing..

bill_daniels

From my experience in aircraft construction, I think what you guys are talking about is what we would have called a "dimple" used to accommodate a countersunk rivet or screw.  These were created with a "dimple die punch" which could create a countersunk hole through multiple sheets of aluminum.  Note that no metal was removed to create the countersunk hole other than the hole itself.  See: 

Brian_Siebert

I would also like to see this added.  We have a 5 axis waterjet, so cutting a chamfered hole in sheet metal is quite common for us.  As a work around I may just have to make an extrude the same as the sheet metal.

jarrod_kysar623

Dude! This is still a problem, even after the "Finish sheet metal model" Feature was applied!???!!! Come on guys! I was led to believe Onshape is just as good as Solidworks or better! I can not get the hole feature to work on a sheet metal part.