On Fri, 6 Jun 2014 19:30:57 -0700, you wrote:
Hi Steve,
Dwell will disengage the tapping sequence, whether it’s a ball drive, friction cone, whatever, you dwell at a set Z and the tap pulls the head into neutral.
Friction of the tap doesn’t effect the depth much, the ball drive style drives until the balls come out of the driven cog… I suppose if the tap had enough inertia to spin a turn or two before it stopped it could be deeper in free-tapping material, but honestly, I don’t see that happening and I’ve used just about every type of tapping head available. Friction drive works the same way, as soon as Z feed stops and the tap walks away from the friction cone, revolutions stop.
Need to be careful on a lathe with a large chuck and lots of inertia.
Not a problem on a commercial machine with spindle brake, but you can
bet the majority on here don't have a brake. Many "home" machines will
continue to turn many revolutions on commanding a stop and it's easy to
tap deeper than you expected if you've not run to the disengage point.
Not sure where or why you think a CNC tapping head cares where in the revolution it stops, it stops because of lack of Z feed.
Stop block and arm needs to align with the lock collar on a Tapmatic -
the lock collar rotates with the spindle.
Your first pdf, well, tapmatic says that, I’ve never used that process, I have the N/C-R head as indicated in your second PDF and have used that process on any and all heads I’ve ever used. I see no reason you couldn’t use the rapid out for a certain distant process, but then I see no value in using it either, and I suspicion you take the chance of yanking the tap gradually out of the collet if you go that way.
YMMV - but I tend to follow manufacturers recommendations and examples.
As you can see in the sub they recommend a fast retract on the self
reversing heads.
G90 Absolute movement
G00 Z1. Rapid to 1mm above hole
G01 Z-8.F2000. Feed in at 100% feed rate
G01 Z-2.F13000. Fast retract 6mm
G01 Z6.F2000. Feed out at 100% feed rate to
clearance plane of 6mm
M99 Return to main program
Steve Blackmore
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Posted by: Steve Blackmore <
steve@pilotltd.net>
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