Thank you guys On Jun 6, 2017 4:29 PM, "Gene Heskett" <ghesk...@shentel.net> wrote:
> On Tuesday 06 June 2017 10:31:45 jeremy youngs wrote: > > > Good day folks. Im waiting for ebay to drop this at my door > > https://www.google.com/url?sa=t&source=web&rct=j&url=http://spectechin > >d.com/Documents/KB/KBMG-212D-manual.pdf&ved=0ahUKEwjM6aSAtqnUAhUG3IMKHc > >T_CUgQFggqMAA&usg=AFQjCNGFBaUXQadurcokpyECREPoUQtv-A&sig2=Pi3K5iam1Y-9U > >dVNt5mrew . It calls for a tach/generator my google foo shows them to > > be very cost prohibitive. I have so far only setup stepper system. I > > am using this as a spindle drive on my mill 90 v treadmill motor. I > > want to be able to rigid tap. My question is can I just use an encoder > > and have Linux cnc control the position ? I think so but before I > > order an encoder I would like to know . Thanks > > Jeremy > > > As long as that controller is passably real time, which with an scr > controller might be a problem since itr can't react any faster than the > lines power frequency, I don't see why not. I have one with an > opto-interruptor setup thats effectively a 268 counts per spindle rev, > driving by a PID control setup, reacts fast enough to rattle the gears > between a brushed 1 hp motor and the spindle of a Grizzly G0704, so the > speed is fairly well controlled. But that has very little to do with > rigid tapping as the 268 steps per revolution is what the (normally Z) > axis follows quite accurately. > > I've a similar setup on The Little Monster, a 7x14 mini-lathe, similar > horsepower but moving a 5" chuck, which has buckets of mass to reverse, > so the turnaround time at the bottom of the hole can be considerable, > particularly in terms of overshoot, so I have to drill the hole at least > 4 tap turns deeper, else the tap hits the bottom of the hole, followed > by the sickening crunch of yet another broken tap. > > I have a hall effect encoder ( 240 steps/rev) on an 11x36 sheldon I am > just now bringing to life, and again, that nearly 8" chuck, and the > turnaround ballistics of the vfd driving the 1 hp, 3 phase motor will > also make me keep track of how much deeper I need to drill the hole to > keep from hitting the bottom of it as its slowing, having reached the > depth you gave the G33.1 in the call. I've developed some hal code that > will tell me how much overshoot I have, but on that 3/4 ton machine, I > don't expect to be able to tap at anything over 250 revs. Those are the > gotcha's, but if the tap doesn't break, the rigidly tapped hole will be > tapped nicely. > > What I'm trying to say is that a common A/B/X quadrature output encoder > (it must have an indeX once per rev) even with much larger slices of > rotation per step than what I am using, can and has done rigid tapping > for several folks here. The quadrature gives linuxcnc the direction > information on the next pulse output as it hits zero speed and starts > the reversal. > > > On Jun 5, 2017 4:05 PM, "Stuart Stevenson" <stus...@gmail.com> wrote: > > > Gentlemen, > > > > > > Debian Wheezy > > > latest linuxcnc release - installed today - but the last release did > > > the same thing > > > Axis interface > > > Kasuga 3 axis mill > > > > > > when starting (run from here) on line 310 I get the error "length of > > > cutter compensation entry move is not greater than the tool radius" > > > > > > This only happens when I 'run from here'. > > > When running through the program the machine runs this code just > > > fine. I cannot run through the program as I must change tools in the > > > holder - set the tool length - and - start by picking 'run from > > > here' (right click on the mouse). > > > > > > status window shows G40 prior to initiating 'run from here' > > > after initiating 'run from here' the error shows and the status > > > window shows G41 > > > mdi g40 resets the status window > > > reinitiation of 'run from here' shows the error and sets the status > > > window to G41 > > > > > > Editing the G41 and G40 out of the program allows 'run from here' to > > > start the machine and run the tool. > > > > > > snippet of code from the program > > > > > > N288X.1684Y-.6104 > > > N289G01Z.105F100.0 > > > N290G41X.0024F4.0 > > > N291Y-1.428 > > > N292G40 > > > N293X.1024 > > > N294G00Z1.115 > > > N295M05 > > > N296M09 > > > N297G91G28Z.0 > > > N298(MSG) > > > N299(MSG TOOL T4.0000 IS) > > > N300(MSG DIA 0.5000) > > > N301(MSG CRAD 0.0000) > > > N302(MSG FLTLEN 0.2500) > > > N303(MSG STKOUT 0.5000) > > > N304(MSG) > > > N305(MSG 1/2 SPOT DRILL.) > > > N306(MSG) > > > N307(MSG SPOT DRILL HOLE) > > > N308(MSG) > > > N309(MSG) > > > N310G91G49G28Z.0 > > > N311T04M06 > > > N312G64P.001 > > > N313G90G00G43 > > > N314S1400M08 > > > N315X1.375Y-3.0M03 > > > N316Z1.115 > > > N317X-.3Y-.1 > > > N318G81X-.2Y-.2Z.075R.275F2.0 > > > N319G80M05 > > > N320M09 > > > N321G91G28Z.0 > > > > > > thanks > > > Stuart > > > > > > > > > > > > > > > -- > > > Addressee is the intended audience. > > > If you are not the addressee then my consent is not given for you to > > > read this email furthermore it is my wish you would close this > > > without saving or reading, and cease and desist from saving or > > > opening my private correspondence. > > > Thank you for honoring my wish. > > > ------------------------------------------------------------ > > > ------------------ > > > Check out the vibrant tech community on one of the world's most > > > engaging tech sites, Slashdot.org! http://sdm.link/slashdot > > > _______________________________________________ > > > Emc-users mailing list > > > Emc-users@lists.sourceforge.net > > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > > ---------------------------------------------------------------------- > >-------- Check out the vibrant tech community on one of the world's > > most engaging tech sites, Slashdot.org! http://sdm.link/slashdot > > _______________________________________________ > > Emc-users mailing list > > Emc-users@lists.sourceforge.net > > 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> > > ------------------------------------------------------------ > ------------------ > Check out the vibrant tech community on one of the world's most > engaging tech sites, Slashdot.org! http://sdm.link/slashdot > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
