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Servo Driven 4th Axis for CNC Mill

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Pete.:
Pretty cool Andrew.

Lot of effort to ID-mark your stock though :)

awemawson:
Well Pete what got me re-started on this was working out how to engrave a calibrated collar for the infeed screw of my Dormer 108 drill grinder. Then I remembered that I'd never sorted the Post Procesor for the 4 th axis  :doh:

Pete.:
Fix a tool to fix a tool - Doc Smith would have been proud!

philf:
Andrew,

All would have been a lot easier if your 4th axis were to accept g-code.

I wrecked my diamond drag engraver by forgetting to set Z and running out of spring travel.

I ground a 120 degree point on a broken 4mm carbide end mill and have used it to do a lot of engraving on stainless steel and anodised aluminium with no signs of wear. I'm not bothering replacing the diamond now. I have made a 90 degree one to try on harder material.

For those running a 4th axis on a machine which understands g-code there's a wonderful free utility called g-code ripper which can convert flat (x&y) g-code to wrapped around a diameter and swapping either x or y for the 4th axis. It can also split g-code into smaller sections if you want to machine parts bigger than the travel of your machine as well as rotate or scale.

Phil.

awemawson:
Phil, it will accept G code just by altering one parameter in the TNC355. But as the good post processors for the TNC controllers generate the Heidenhain conversational code I tend to use that

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