Tach replacement options

[Scott Pancheau]

Hi, I have a lathe I am finishing retrofitting to Dynomotion. The old control used encoder feed back translated to emulate tacho function. One of the axis has no place to add a tach to feed back to the servo drive now that the old control is out of the picture. I have a cheap DAC board that can receive encoder pulses and output dc voltage.It outputs the same polarity regardless of which direction the encoder is turned, so it won't work as a substitute for a tacho. Do you know of an option to purchase that will take the encoder pulses and emulate pos and neg voltage to the drive?
Thanks,
Scott

[TomKerekes]

Hi Scott,

No I don’t. You might be able to do it with KFLOP.

Are these Analog drives? You might be able to just ground the tach input and operate as torque mode.

[Scott Pancheau]

Thanks Tom,
They are analog DC servos in velocity mode.I found one that may work. I have to call the maker and ask.