Servo Driven 4th Axis for CNC Mill

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Hazel:
Ooo that is interesting. All the 151 blurb says is "MP158=Setting of 16 markers to binary number" which isn't so very helpful. The User manual simply says to activate the 4th axis from the user parameters. I've sent an email out to a repair company to see if they do an exchange on the board, as it may save a month of my life :)
H

awemawson:
They are probably machine specific - Heidenhain just provides the facility for manufacturers to have 'flags' that the user can set that are (usually) used as inputs to the PLC ladder logic

Somewhere buried in the parameters is one that sets the count per rev of the encoder - iirc I harp on about it in the pages above when I'm making the belt drive for my encoder to change from 125 to 100 pulses per motor rev. If that hasn't been set and left blank it may explain your problem. There are only two permissable values and in my case it was 100 x 4 x 90 = 36000 pulses per table rev. I think 18000 is the other one

Hazel:
Hi Andrew,
Sadly nothing in the TNC151 documentation directly says how many counts the rotary table should be. There is an option (MP15) to change the interpolation of the 4th encoder between 10 and 20 divisions , and another (MP90) that says to display the 4th axis as 0 to 359.999 for options A,B & C . So I guess that would be the 36000 and 18000 options. ? One of the documents also mentions that the 4th axis reference end position be tied to 24V, yet my rotary table does have a normally closed index switch - how is this supposed to be wired then?

regards, hazel

awemawson:
Hazel,

I've pm'd you some info I got when I was struggling.

Also picture below is of my home switch wiring - note it does ref pulse inhibit and home on one c/o switch

Hazel:
Hi Andrew, again, many thanks. My BP Interact 1.2 only uses the reference end positions for X,Y. Z and I think it uses e-stop if you go over the end of the ref point.
I've given up trying to get the Heidenhain repair places to return my emails. Instead I squandered my time wiring up the Analogue PCB to the appropriate Voltages, and stuck a SEM motor into each axis to see the voltages. I managed to trace it down to a little red module, which I think is a capacitor array or maybe a transorb input protector array?

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