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" <[email protected]> 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 > > [email protected] > > 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 > [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> ------------------------------------------------------------------------------ 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 [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
