On Wednesday, March 02, 2011 09:42:40 am Edward Bernard did opine: > I've been very happy with my CNC4PC C10 board and the support I got > from Arturo to get me past my "newbie" mistakes was great. It may be > "vintage" but then again, so am I . > Hehe, I resemble that remark myself as I'm on my 77th trip around this star.
For my spindle control, I used a PMDX-106 but had to (in the interests of dependability since its available relays, 3 IIRC, were quite small) so I used some P&B Ice cubes to boost the contact ratings and effect the reverse function using the DPDT in the usual crossed contacts arrangement. It has worked great for a couple of years now. I moved the controller out of the head of my mill and put it in a separate box along with the PMDX board run with a wall wart. My biggest problem is that center off switch on the PMDX controller, which is set so the off position is computer control, up is manual fwd and down is manual reverse, goes by the off position too easy. I have a suicide braking resistor on the off side of the main relay that stops the spindle in about 1 second, but if I accidentally go by off to the other direction, I blow the spindle motor fuse, as I should. The 2nd time it also took the hexfet out of the controller, but I checked the specs on that one, and the specs of those used as common items in an old computer PSU that had silently failed, found the PSU hexfets were rated quite a bit higher without having a huge increase in the gate capacitance which might be deadly to its driver stage, and put one of those in the controller, and I've probably blown $40 worth of fuses since with no other problems. That got so bothersome that I rigged an ammeter in the motor circuit so I could see how hard it was working, and that stops 99% of the blown fuses. I didn't need a BoB as my 4 axis xylotex handles that, not neatly but nicely. -- 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) <http://tinyurl.com/ddg5bz> If you're right 90% of the time, why quibble about the remaining 3%? ------------------------------------------------------------------------------ Free Software Download: Index, Search & Analyze Logs and other IT data in Real-Time with Splunk. Collect, index and harness all the fast moving IT data generated by your applications, servers and devices whether physical, virtual or in the cloud. Deliver compliance at lower cost and gain new business insights. http://p.sf.net/sfu/splunk-dev2dev _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
