Hole callout: allow both countersink and counterbore

jason_atwood316

I'm creating a part which has a hole which has both a countersink and a counterbore. Looking at the hole callout tool I can only pick one or the other. Ideally I should be able to pick both.

lougallo

@jason_atwood316 Can you provide an example?  Are you wanting to have it add a chamfer to the edge of a counterbore or something else?  Picking a cbore on entry and a countersink on exit?  Examples will help scope this.

peter_sears

An example I have is the need for a counterbored hole (to minimise the length of the fastener required) with a countersink at the bottom of the counterbore (because common wood screws have countersink heads).

I also like the idea of being able to add chamfers to holes, but that's another story (and another level of complexity)

Newbie to OnShape here, loving the power (but still getting used to it!)

glen_dewsbury

A reasonable way I can see to make a recessed wood screw hole is with 2 steps. Extrude a hole then use the bottom for the hole function.

glen_dewsbury

@lougallo

Hey Lou. I can see a very good use for the form tool on non sheet metal parts as well.

I noticed form tool works fine with just the remove selection. Sure looks like something that went around a few years ago as an IR. Maybe under the heading of 'blocks'? With configuration many things will work like the original screw hole or in this sample maybe bearing mounts.

Peter. This would cover the chamfers when needed.

https://cad.onshape.com/documents/1d35f627efed69ade1b185a2/w/3713e0d14bfcfe62f90cebb8/e/64cc9735b859384b784dda4a

jelte_steur814

Another option that i use sometimes is to start with a countersink hole and add a move face (translations) afterwards… (saves you from manually determing the right diameter for the extruded hole mentioned above.

Works fine for 3D, i don't believe a call-out on a drawing will be accurate though…

nick_papageorge_dayjob

https://forum.onshape.com/discussion/comment/115292#Comment_115292

This type of hole is specialized and should probably have a cross section with full dims on the 2D, IMO, rather than a shortened callout.