I think you are a little confused with soft limits/home switches. Soft limits are in relation to your home switches (machine coordinates). They do not move with touch off. They work wonderfully. once I home ours - no matter how hard I try I cannot get the machine to hit the limit switches :). (I have tried)
I have tapped many many holes now and am amazed every time I do. I have not broken a tap yet (knock on wood). our spindle has a 5hp motor and a lot of rotating mass. I have to be careful as the over shoot is quite large. latest tapping.. https://www.youtube.com/watch?v=qBQ7RSuRAls sam On 09/29/2014 10:21 PM, Gene Heskett wrote: > On Monday 29 September 2014 22:42:26 Jon Elson did opine > And Gene did reply: >> On 09/29/2014 07:32 PM, Gene Heskett wrote: >>> I am doing it on a lathe, and I have seen that occur. From what I can >>> deduce, its running into the - limit on z, stopping the carriage, but >>> keeping track of where its stopped and picks Z back up in the back >>> out move as its internal z position matches where it stopped. >> The simplest way to check if this is the cause is to >> manually jog the Z axis as far as it >> needs to go for the tapping sequence. if you cannot jog it >> that far in -Z, then you >> have hit the Z minus soft limit. As Gene mentions, >> apparently on at least some >> versions, the spindle synched motions don't CHECK for travel >> limits before performing >> the move. It could check for soft limits for the programmed >> Z move, but can't know >> how far past that Z depth it will go while the spindle >> decelerates. >> >> And, if you are not using homing with home switches, Dave, >> you might want to >> set this up and enter the actual limits of the machine. >> >> Jon > That won't be a very informative test in many cases because the machine > may have been "touched off", a fancy way of saying that the limit is not > now whats in the .ini file, its in the original machine co-ordinate > (G53?), and ANAICT, that assures that regardless of what its touched off > to, the actual limit has not been moved physically unless the steppers > have slipped. > > Also, a G33.1 move is not interruptible, I have hammered the axis e-stop > button to no avail, and I have shut down the motor power, but it remains > in a locked state with the carriage following the chucks hand driven > rotation until it has been manually backed out and is back to the position > it would end up in if not wrapped in a "peck" loop, which I do 100% of the > time. So I generally loosen the chuck holding the tap and let it spin > with the workpiece while doing a back out move until it unlocks, then > retrieve the tap. At least I won't break another tap unless I am clumsy. > > FWIW, 0-80 taps are fragile even then. > >> ----------------------------------------------------------------------- >> ------- Meet PCI DSS 3.0 Compliance Requirements with EventLog Analyzer >> Achieve PCI DSS 3.0 Compliant Status with Out-of-the-box PCI DSS >> Reports Are you Audit-Ready for PCI DSS 3.0 Compliance? Download White >> paper Comply to PCI DSS 3.0 Requirement 10 and 11.5 with EventLog >> Analyzer >> http://pubads.g.doubleclick.net/gampad/clk?id=154622311&iu=/4140/ostg. >> clktrk _______________________________________________ >> Emc-users mailing list >> Emc-users@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/emc-users > > Cheers, Gene Heskett ------------------------------------------------------------------------------ Meet PCI DSS 3.0 Compliance Requirements with EventLog Analyzer Achieve PCI DSS 3.0 Compliant Status with Out-of-the-box PCI DSS Reports Are you Audit-Ready for PCI DSS 3.0 Compliance? Download White paper Comply to PCI DSS 3.0 Requirement 10 and 11.5 with EventLog Analyzer http://pubads.g.doubleclick.net/gampad/clk?id=154622311&iu=/4140/ostg.clktrk _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
