Chris Radek wrote: > On Tue, Apr 15, 2008 at 11:40:59AM -0500, Jon Elson wrote: > > >>Another topic... I want to try some rigid tapping a la the >>Mazak on my portable mill and bring that to the Workshop. >>Is there a sample G-code program or a program that creates the >>G-code for that cycle? I'm thinking of hooking my spindle motor >>to another servo amp. Since the servo box only has a 50 V power >>supply, I'll lose some RPM but I think that will be OK. > > > It's very easy: > > G20 G90 > S250 M3 (spindle nice and slow) > G0 X0 Y0 Z0.1 (0.1" above a previously drilled #7 hole) > G33.1 Z-0.6 K0.05 (Tap 1/4-20, 1/2" deep) > M2 OK, cool! I've been drilling/tapping holes with these "thread drills", that have a point just like a drill bit, and the rear section is a tap. I started around 300 RPM, and recently have been doing it at 1200 RPM. The problem is my Procunier tapping head is such a HUGE contraption that I have the point of the tap about 8" from the machine spindle. I think if the drill point wanders just a little before biting, the hole goes in crooked and can break the tap. It gets trickier because the drill can't feed at the tap feed rate, so I have to do a slow feed of about .001 - .002" per rev until the drill is through, then accelerate to the tap rate. I will have to try this out as soon as I get a few things fixed up on the machine.
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