UC100 or other controller rigid tapping

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UC100 or other controller rigid tapping

Postby infamous_panda » Thu Jul 30, 2020 1:57 am

I am trying to re-purpose a router gantry frame from AVID CNC for a dedicated 4axis hole drilling and tapping station. I plan to drive a R8 spindle with an AC servo motor connected with a toothed XL belt at a 2:1 ratio. I am at a bit of a loss as to how to wire this together and the electronics I need. My other router setup uses a UC100 and I am guessing that the 5 input pins are maxed out with

1. Probe
2. XYZ home/limits
3. Y2 home for squaring
4. blank
5. blank

As I understand it, UCCNC needs three input signals for the spindle encoder? Is there a way to supplement the inputs of the UC100? If not which controller would be recommended. Also many of the threads I have read through use an external encoder than the one built into the servo or servo amplifier. Is this something that is really required? Any guidance or reference links for this sort of thing would be greatly appreciated.

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Re: UC100 or other controller rigid tapping

Postby dezsoe » Thu Jul 30, 2020 8:15 am

You need one more input. UC400ETH has the double inputs and outputs as the UC100, AXBB-E has 6+5 inputs, UC300ETH has much more. I recommend AXBB-E, because that has some isolated inputs and outputs and also a safety charge pump driven output.

The separate encoder is needed, because the internal has a too high resolution. The problem is that the inputs have a maximum frequency and the high resolution encoder makes a too fast input. For tapping (and other synchronized jobs) a 100 CPR encoder is enough. (Also, because the index output of an encoder is gated with the A and B signals, the index pulse is so short with a high resolution encoder that the controller cannot detect it.)
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