WTB: Encoder (or complete servo) for Hurco CNC

[gr8legs]

Well, MillZilla (my Wells-Index mill with a Hurco KM-3P CNC retrofit) has thrown a shoe and lost her mind on the Z-Axis.

A bit of troubleshooting reveals a non-functioning encoder on the Z-Axis Stepper motor.

Apparently Hurco used several different motors/steppers for their CNC and I need to replace the encoder with something compatible. Servo motor are Reliance Electro-Craft Model E727, P/N 727-903-0862.

Photos show servo in installed position and close-ups of encoder P/N (Renco? 77678-038), and encoder internals.

Anybody got a spare unit or a wrecked out mill with an intact servo? I am definitely willing to pay a reasonable sum as without this widget my CNC is dead, dead, dead

Thanks in advance

Stu



American Airlines wants to cut costs by "simplifying" maintenance". Passengers can help by watching for falling parts

 

[markba633csi]

Stu I wonder if that encoder could be repaired? How hard is it to remove from the machine? I'm only 1 state away
Those two ICs are cheap and readily available. If you can send it to me I may be able to revive it for only parts cost and maybe a couple bucks labor
You might be able to stuff it into a small priority box
-Mark

 

[JimDawson]

If you can figure out what the line count is, any 4 channel quadrature encoder will work. I have not be able to find the specs for that particular part number.

 

[gr8legs]

Progress (?) Report:

As the OP on this thread I spent a good deal of time twiddling with the servo and diagnosing encoder operation and associated wiring.

I determined that the processor was receiving 'count' pulses but not once-per-turn 'index' pulses - so perhaps just a loose or corroded connection somewhere between the encoder and the CPU was the problem.

Repeatedly removing and replacing the inter-board connections - perhaps cleaning them up in the process - (a tried and true troubleshooting technique) eventually returned the encoder to operating condition.

Whether this is actually a 'fix' or just a mirage is yet to be seen but for now it is working again and I am back and running. Good thing too as I was halfway through milling 1.392" diameter holes through two pieces of 1.5" CRS.

Thanks to Mark and Jim for the advice and encouragement!

Stu

 

[markba633csi]

Great news! When you get a chance go back and clean the connectors more thoroughly, probably keep it going forever
Chips seldom just fail for no reason, connectors are always prime suspects
-Mark