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. 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.
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