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CS-Lab / Re: IP-A and Linear Scales / Encoder not directly on motor - how?
« on: January 12, 2016, 03:48:01 PM »
So have a response from CS Labs. The red numbers are a count of errors. Suggested that I check shielding etc.
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Chaz,
The config you describe should work fine. I have a similar config in that servo amps receive only tach feedback from servos. On my config encoders are on the servo motor shafts however I see no reason why your config should not work. Just compute the steps/inch or steps/mm correctly according to the location of your encoders. Since you have 2000L encoders they provide 4 edges per pulse or 8k/rev edges. If encoders are on ball screws directly you simply divide 8k/pitch to arrive at the correct scaling. On my machine I have .2"/rev pitch so I would calculate 8k/.2" to get the correct scale. The scale is entered In Mach under Config-->Motor Tuning.
In theory it may be more accurate to have encoders directly on ball screws if, like my machine, screws are driven by belts. It would seem that belts stretching could affect the accuracy of my machine. If however the encoder is fixed to the screw then belts could not affect accuracy. Does this make sense?
Good Luck!
Mike