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non-circular boring.. Literally - it is boring!

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sam sokolik31/03/2020 04:10:11
51 forum posts

I decided to see if I could create a polygon shaped hole with a little math and a cnc..

And now in aluminum!


Edited By sam sokolik on 31/03/2020 04:16:05

Thor31/03/2020 06:09:27
1212 forum posts
37 photos

Impressive Sam, now you should be able to make your own socket head cap screws.


Martin Connelly31/03/2020 09:41:57
1243 forum posts
152 photos

Looks useful. I expect the maths is similar to what is used for single point turning of polygons on CNC lathes with the added complication of a rotating tool.

Martin C

Brian H31/03/2020 12:43:13
1579 forum posts
104 photos

That's excellent Sam, thanks for sharing. I'm just beginning to find out about CNC and it's fascinating what can be achieved.


sam sokolik31/03/2020 14:01:20
51 forum posts

I expanded on the work Andy did...

He also did some grinding mock ups..
sam sokolik31/03/2020 14:18:49
51 forum posts

I also am working on the functionality of slaving the x axis to the radius of the polygon... SO you can do things like create a profile for the polygon to follow. So this is a radius into a taper..

blowlamp31/03/2020 15:54:31
1308 forum posts
83 photos

That's interesting stuff you're doing, Sam. yes

Could you post some gcode here please, so I can try it with my PlanetCNC control, which is designed to be LinuxCNC compatible?

I'll get Alan at cncyourmyford to have a look too as I'm sure he'll be interested.


sam sokolik31/03/2020 17:12:10
51 forum posts

This is a simple hal component that takes the spindle posltion from the encoder and calculates where the x/y axis need to be to keep the tool tip perpendicular to the polygon. (well - to the inscribed circle.) This is done in the real-time layer of linuxcnc. So 1000 times a second it reads the spindle postion and calculates the polygon shape. I use currently the digital/analog i/o functionality in gcode to communicate with the component. I think it could be converted to remap to make it more user friendly. I don't have the gcode here at the moment but I think this is the latest hal component.


sam sokolik01/04/2020 05:14:09
51 forum posts

A hex bolt head isn't exactly a standard.. but..

Michael Gilligan01/04/2020 07:53:19
15478 forum posts
668 photos

Nice !!


sam sokolik02/04/2020 01:11:05
51 forum posts


sam sokolik04/04/2020 01:18:53
51 forum posts

Broach this! (the vertical lines are the encoder resolution...)

Michael Gilligan04/04/2020 07:22:01
15478 forum posts
668 photos

Comment rev.1

Very Very Nice !!


sam sokolik10/04/2020 16:55:17
51 forum posts

Ok - I need to get a higher resolution encoder.. Then The surface finish will be better and I will be able to go slightly faster.... (I might have to bake in backlash comp too.... (x axis has a bit of backlash))

sam sokolik13/04/2020 15:07:58
51 forum posts

Phase 2 - Better spindle encoder..

sam sokolik22/04/2020 05:08:13
51 forum posts
Almost done!
sam sokolik24/04/2020 05:19:44
51 forum posts

sam sokolik26/04/2020 22:10:53
51 forum posts

Encoder seems to work better...

Michael Gilligan26/04/2020 23:08:42
15478 forum posts
668 photos

Comment rev.2

Even nicerer still

... I’m clean out of superlatives now angel


sam sokolik29/04/2020 15:43:20
51 forum posts

I think I get a D for effort...

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