On Wed, Nov 17, 2010 at 8:18 PM, Jon Elson <[email protected]> wrote: > Igor Chudov wrote: >> John, if you do not mind, a couple of questions. >> >> How much did you pay for the CHNC >> >> and >> >> How hard was the retrofit. Was it all about pushing wires and computer >> setup (like it was with my mill, sans encoder mounting), or did you >> have to do a lot of precision machining and parts fitting? Did you >> reuse existing encoders? >> > HNC and CHNC lathes have resolvers, not encoders. Rumor has it that > either the resolvers are 4-pole > or have a 2:1 gear-up so that you get two indexes per spindle rev. That > could be fixed with one extra > sensor to qualify the index. I have a resolver to quadrature converter > that has worked on the CHNC.
Nice to know. > Depending on the vintage, the existing GE servo amps may not be to your > liking - SCRs and Selenium > rectifiers, looks like something out of Dr. Frankenstein's lab. You may > also need to rig a priority encoder > or similar scheme to convert tool turret reed switches to an encoded > tool number. At least one CHNC has > been converted with my PWM controller and servo amps, some others were > done with other velocity > servo amps. Servo amps are cheap and good nowadays. I have no problem replacnig servo drives. I did that on my Bridgeport too, because I fscked up the original Bosch amps. They required 3 phase anyway, so I did not really want them. Thanks for your feedback. As for the machine currently on ebay, I think that the seller is asking too much for someone's failed project that is in disrepair. But I remain very tempted. i ------------------------------------------------------------------------------ Beautiful is writing same markup. Internet Explorer 9 supports standards for HTML5, CSS3, SVG 1.1, ECMAScript5, and DOM L2 & L3. Spend less time writing and rewriting code and more time creating great experiences on the web. Be a part of the beta today http://p.sf.net/sfu/msIE9-sfdev2dev _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
