On 11/07/2010 8:11 AM, Ed wrote: > Well, I could use some help fellows! My slow motion Hardinge CHNC > project just got speeded up with the demise of the spidle motor on my > Pratt and Whitney lathe. What I have got is a stripped machine, the > resolvers have been replaced with encoders on the X and Z axiis and new > cables pulled through to the connection area on the back of the X > axis.Both cables are shielded and drained 6 twisted pair for a total of > 12 leads per cable. Questions:Can I run the axis encoder in the same > cable as the turret encoder? The turret runs at 12Volts logic, will this > cause any crosstalk? If your encoders are differential, this should be no problem. If not differential, try it and see. It most likely will work fine. > How did Hardinge do threading with a resolver on > the spindle? Most reslover converters also produce the index signal. If your encoders are A-B only, you need to put an ABZ encoder on the spindle, so you get the index, too. > I cannot find an index mechanism or any extra leads that > would go to one. The spindle resolver is still in place but can be > replaced easily with an encoder with index. The plan is to fit this all > up with Pico Systems PWM controller which I have at hand and if needs be > I have an extra Par port card for extra I/O. Ed. > Oh, well, the Pico Systems resolver converter would provide index from the resolver, so you could use that, or get an encoder with index.
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