We use a similar one, same power unit but an older Electrocraft motor instead of the Chinese copy. The speed is more or less adequate for engraving, around 8000 to 10000 RPM. For the one on eBay, I worry about runout. It looks like they just used a setscrew to secure the collet holder to the motor shaft.
I would guess the minimum speed is related to the loss of torque. This control does not provide IR compensation for motor loading. Steve Stallings > -----Original Message----- > From: Gene Heskett [mailto:[email protected]] > Sent: Friday, December 27, 2013 5:55 PM > To: Enhanced Machine Controller (EMC) > Subject: [Emc-users] What do you folks think of this kit for > etching pcb's > > > <http://www.ebay.com/itm/400W-CNC-Spindle-Motor-Kits-PWM-Speed > -Controller-With-Mount- > Bracket/221268429297?rt=nc&_trksid=p2047675.m1851&_trkparms=ai > d%3D222002%26algo%3DSIC.FIT%26ao%3D1%26asc%3D19463%26meid%3D37 > 02793811656558252%26pid%3D100005%26prg%3D8798%26rk%3D1%26rkt%3 > D5%26sd%3D380705868216%26> > > I am thinking of making up a whole new column and Z drive > assembly that > I could swap out by 4 bolts & a couple of cables when I wanted to do > some pcb work. > > LMS has the column, I already have the z sled casting, and I > can easily make > a fresh ball screw Z drive. > > I like the idea that this controller takes a straight pwm > signal as input, > nut I'm not sure why the 3k revs minimum speed. Cooling > related under load > perhaps? > > Cheers, Gene > -- > "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> > > No one may kill a man. Not for any purpose. It cannot be condoned. > -- Kirk, "Spock's Brain", stardate 5431.6 > A pen in the hand of this president is far more > dangerous than 200 million guns in the hands of > law-abiding citizens. > > -------------------------------------------------------------- > ---------------- > Rapidly troubleshoot problems before they affect your > business. Most IT > organizations don't have a clear picture of how application > performance > affects their revenue. With AppDynamics, you get 100% > visibility into your > Java,.NET, & PHP application. Start your 15-day FREE TRIAL of > AppDynamics Pro! > http://pubads.g.doubleclick.net/gampad/clk?id=84349831&iu=/414 > 0/ostg.clktrk > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------------ Rapidly troubleshoot problems before they affect your business. Most IT organizations don't have a clear picture of how application performance affects their revenue. With AppDynamics, you get 100% visibility into your Java,.NET, & PHP application. Start your 15-day FREE TRIAL of AppDynamics Pro! http://pubads.g.doubleclick.net/gampad/clk?id=84349831&iu=/4140/ostg.clktrk _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
