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Well there's your problem then.

If 1600 micro steps and 4mm pitch with 20T on motor and 40T screw then try 800 in steps per. So formule (micro steps/pitch) * (screw pulley/motor pulley)

Try different velocity and acceleration settings in Mach

[QUOTE=croy;22556] i am trying to do the slots in .5 -.8mm passes.
/QUOTE]
I did 3000rpm while slotting 2mm deep/pass (I can try to find cambam file to check feedrate but I think 60mm/min 4mm dia...

I've been 12mm milling alu sheet with 2 and 4 flute end mill(4flute coated from arceurotrade) to my PC coolers project with constant flow of regular diesel on it as coolant. no clogging at all and...

Sounds like the cutting edge has picked up a layer of gunge and isn't a cutting edge anymore. Prise it off with a screwdriver. As soon as the edge gunges you stop cutting, start cold forming and the...

sheet ally is usually pretty soft, and will gum up quickly. Try a hand spray with suitable coolant.