On Tue, 02 Oct 2007 20:57:37 -0500, you wrote: >sam sokolik wrote: >> really - I was in on a converstion with art at the cncworkshop - he had said >> he thought mach would probably never do rigid tapping.
He's known to be wrong on occasion <G>. >> Could you explain? I could see if you had the spindle setup as a rotory >> axis... but other than that I have no clue. Maybe some external hardware - >> doing it outside of mach? (I am not a mach person). The spindle is set up as a spindle. The feed/speed is at the thread pitch for rigid, at 95% pitch for an expanding nose tapping head. >Yes, if they use one pulse per rev in a single-channel sensor, >then Mach can't know which way the spindle is turning. It knows because you told it either M3 or M4 - everything doesn't "have" to be complicated. >You have >to have a quadrature encoder with index to do it properly. And, >you need much more than one pulse per rev so the Z axis can keep >up with the rapid speed change when the spindle reverses. Define "properly" - I've done it, and somebody else wrote recently they have been rigid tapping regularly with Mach. Nobody told them they couldn't - so they did. I tap on a regular basis but not strictly rigid fashion - I use an extending nose tapper "Tapmatic SM4". It works fine. Through hole is easier than blind hole, but spiral point taps are pretty much essential. But I also remember all those people, including Art, who told me years ago that you couldn't do lathe threading with only one pulse per rev ;) Steve Blackmore -- ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2005. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
