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 > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> US V Castleman, SCOTUS, Mar 2014 is grounds for Impeaching SCOTUS ------------------------------------------------------------------------------ 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 [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
