Countersinks

[tech1]

To create a countersink use Line | Machine | Auto - add the chamfer to the near edge of the hole. For example, for a 82 degree countersink a 50 (90 - 82/2) degree chamfer is very close, or use Comments to Machinist for a more specific angle.

[keness]

If it is being considered, I would like to add my voice to perhaps making "Countersink" an actual item to be selected in a list or in the properties of a hole... It seems like a pretty common thing, and it would be handy to have a straightforward place to just set it, rather than have to "create" it.

For my project, since I prefer not to use Comments to Machinist, I just decided to do the ones I can't ignore by hand and not bother with the ones I can get away with skipping, but I'd rather give you the money than spend hours countersinking many dozens of holes!

Thanks!

[Tech2]

We appreciate the suggestion. But whatever the UI, you have to specify two numbers so I'm not clear on the advantage of another approach. And for this particular use of Comments To Machinist you can add text "$0 CTM" to remind our order processing staff that we do not charge extra in this use of CTM.

[keness]

Oh I wasn't complaining, just commenting.

I just strikes me as a fairly self-contained operation which would benefit from having its own section, just like threading. It would be "easy" to specify threads in a CTM, but it is much nicer to specify them as a machine, the way you have them, complete with any unique-to-threading options. In the case of countersinking, the 3 or 4 standard countersink angles and/or the depth.

It seems like it would be more intuitive and I also didn't know about the "$0 CTM" thing. (Though I would still far prefer to have things specified through the software rather than clutter the design up with CTMs...)

Were there a Countersink 'machine' though, it would have taken me all of two seconds... That's all I was saying.

Thanks!

[Tech2]

Your points are well taken. Thanks for your feedback.

[mrmad]

Is there a recommended size of the chamfer? Obviously it would depend on the diameter of the hole, but is there a ratio of chamfer size to diameter you recommend?

I'm also trying to countersink holes on the backside of a part and it seems to want to drill the countersink though. For instance, I've drilled a 0.1" hole in a 1" block, I can put a 0.04" countersink on the topside of the hole, but if I switch to the bottom view and try to put the 0.04" countersink, it bores it through the hole

[Tech2]

You should measure the screw head. Please upload the .ems file so I can assist.

[mrmad]

I guess I answered my own question. Your software only seems to allow countersinking on the side of the drawing that the hole was initially drawn. Meaning you can countersink a hole drawn on the top side of a part, but if you draw the hole on the top side, then try to countersink the bottom side of the hole it seems to bore the countersink all the way through.

I can fix this by initially drawing the holes on the bottom side. I guess this means your software will not allow countersinking both sides of a hole.

[Tech3]

You can countersink both sides of thru holes. Line | Machine | Mill 3-Axis advises that to shape the opposite side you need to select the opposite view.
Can you please clarify "it seems to bore the countersink all the way through."

[mrmad]

It appears bored through in the 3D view. I'm new to your website/software so I don't know how to upload files, but I can send you a file if you'd like.

[Tech2]

Please see How to post a CAD file.

[mrmad]

See attached file. The left side hole (from top) is only countersunk on the top. The right hole is countersunk on both sides. The 3D view of the right hole looks like the countersunk dia went right through.

[Tech2]

Seems to be a glitch in the 3D view - thanks for reporting it. However you can see in View | Front that it's modeled correctly so you can proceed with such a design.

[Air_Cooled_Nut]

[Reederoo]

+1 to the suggestion of having a countersink tool that only requires the screw size and depth. I am trying to create a part that needs holes countersunk for flathead #2 screws. I finally figured out after poring over screw size charts that I need a 0.092" hole with 0.040" 82deg chamfer so that the widest part will end up 0.172". I created that using near edge chamfer, but now my problem is that the 3D view doesn't show the holes at all, let alone the chamfer. I have attached the .ems file. I would really appreciate it if someone can look at it and tell me why the holes and chamfer aren't showing. The holes I am talking about are the ones on the back side nearest the large hole. I would like to see the rendering as confirmation rather than using comment to machinist and hoping that it turns out like I want.

Thanks in advance for any help.