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

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

This topic has 27 replies, 8 voices, and was last updated 18 May 2020 at 18:10 by sam sokolik.

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31 March 2020 at 04:10 #461186
sam sokolik
Participant
@samsokolik60334
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
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31 March 2020 at 04:10 #15266
sam sokolik
Participant
@samsokolik60334
31 March 2020 at 06:09 #461189
Thor 🇳🇴
Participant
@thor
Impressive Sam, now you should be able to make your own socket head cap screws.

Thor
31 March 2020 at 09:41 #461232
Martin Connelly
Participant
@martinconnelly55370
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
31 March 2020 at 12:43 #461282
Brian H
Participant
@brianh50089
That's excellent Sam, thanks for sharing. I'm just beginning to find out about CNC and it's fascinating what can be achieved.

Brian
31 March 2020 at 14:01 #461308
sam sokolik
Participant
@samsokolik60334
I expanded on the work Andy did…

He also did some grinding mock ups..
31 March 2020 at 14:18 #461314
sam sokolik
Participant
@samsokolik60334
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..
31 March 2020 at 15:54 #461327
blowlamp
Participant
@blowlamp
That's interesting stuff you're doing, Sam.

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.

Martin.
31 March 2020 at 17:12 #461345
sam sokolik
Participant
@samsokolik60334
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.

**LINK**
1 April 2020 at 05:14 #461418
sam sokolik
Participant
@samsokolik60334
A hex bolt head isn't exactly a standard.. but..
1 April 2020 at 07:53 #461426
Michael Gilligan
Participant
@michaelgilligan61133
Nice !!

MichaelG.
2 April 2020 at 01:11 #461659
sam sokolik
Participant
@samsokolik60334
Hmm…
4 April 2020 at 01:18 #462215
sam sokolik
Participant
@samsokolik60334
Broach this! (the vertical lines are the encoder resolution…)
4 April 2020 at 07:22 #462222
Michael Gilligan
Participant
@michaelgilligan61133
Comment rev.1

Very Very Nice !!

MichaelG.
10 April 2020 at 16:55 #463761
sam sokolik
Participant
@samsokolik60334
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))
13 April 2020 at 15:07 #464401
sam sokolik
Participant
@samsokolik60334
Phase 2 – Better spindle encoder..
22 April 2020 at 05:08 #466228
sam sokolik
Participant
@samsokolik60334
Almost done!
24 April 2020 at 05:19 #466629
sam sokolik
Participant
@samsokolik60334
26 April 2020 at 22:10 #467305
sam sokolik
Participant
@samsokolik60334
Encoder seems to work better…
26 April 2020 at 23:08 #467310
Michael Gilligan
Participant
@michaelgilligan61133
Comment rev.2

Even nicerer still

… I’m clean out of superlatives now

MichaelG.
29 April 2020 at 15:43 #467884
sam sokolik
Participant
@samsokolik60334
I think I get a D for effort…
3 May 2020 at 23:29 #468953
sam sokolik
Participant
@samsokolik60334
I do actually talk at about 6:30m
10 May 2020 at 16:19 #470666
Thomas Dye
Participant
@thomasdye26707
I see that continuous stream of chips and wonder how difficult it would be to add chip breaking in the g code?

Would definitely stop them building up around the tool.

I suppose it could be done by alternating the path or by over-boring the hole slightly first.
11 May 2020 at 17:08 #470948
sam sokolik
Participant
@samsokolik60334
Posted by Thomas Dye on 10/05/2020 16:19:55:

I see that continuous stream of chips and wonder how difficult it would be to add chip breaking in the g code?

Would definitely stop them building up around the tool.

I suppose it could be done by alternating the path or by over-boring the hole slightly first.

Other than the spindle synced motion – the gcode is normal. You could do a pause every so far..

sam
15 May 2020 at 17:22 #471981
sam sokolik
Participant
@samsokolik60334
Actual spinning encoder. (thought I put this in another video..)
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