Servo Driven 4th Axis for CNC Mill

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Hazel:
Thank you very kindly. :thumbup: If you can think of a way to test the 4th axis encoder without the rest of the 4th axis attached, that would also help me out a bunch, I've spent all day today trying to get this encoder to run.
-H

awemawson:
Hazel,

I assume that you have a manual with a list of the parameters and their make up? If not it's freely downloadable from the heidenhain.de web site.

I've just checked my parameters against those you list:

MP72=9, Mine = 0
MP75=0, Mine = 0
MP76=1, Mine = 0

I've just dumped all my parameters to file and I attach a copy. Remember - mine is a TNC355 not a TNC151. I think that the lower numbered parameters are the same but best to check

Hazel:
Hi Andrew,
thank you, thank you, thank you! I do have all the 151 manuals from Heidenhain, which are kind of sparse. Installation/Interface, Service Instructions, operators book, plus all the Bridgeport stuff. Your MPs being zero makes sense, as none of your axes are inhibited. I'm right in the guts of my TNC151 analogue board, tracing through the 11uA buffers to a bunch of comparators, which I can only guess is some sort of ADC to do the phase-quadrature interpolation. Next step is to power up the analogue board with an encoder and check the comparator outputs to compare Z and IV. Maybe I should save up for a 355 control...
Regards, Hazel

Hazel:
Some photos of my Mad modding:

awemawson:
I think that logically this bit of the two controls is the same, although the implementation is different. IIRC the encoder inputs on the 355 wire directly to custom lsi modules just onboard from the connectors - when I had a 151 I never pulled it apart :)

On my 355 in it's Beaver Partsmaster there is a user parameter (165 I think) that enables / disables the 4th axis - let me have a poke around in my hard - drive ....

... no I was wrong - it's parameter 158 - copy of decode attached

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