Tonight I hooked up the jogwheel and one of the motor's encoders (100 line
and 2500 lines) to the parport, and with turning up the ferror in the ini I
can use it like a DRO, turning the encoders moves the axis readings. I was
wondering if i could just build an H bridge or similar switching circuit to
run the output between the -12 and +12V rails on an AT or AT power supply,
maybe use 7809 and 7909 regulators to keep it below 10V, to run to the
analog VCMD input on the servo amp? the manual to the mill says that it runs
+/- 9V, which seems odd compared to everything else. Then I'll have to
likely put in a couple switches on the a and b's of the encoders to send the
quadrature to both the amp and back to EMC. If I managed my math right, if
i can get the parport sampling at 30 khz (i think i read somewhere that that
should be realistic) I should be able to keep track of 180 RPM or so on the
encoders, if everything stays ideal.
Also, what do I need to add in the hal and everything to enable an index on
the encoders? I'm thinking I can see if it is missing counts if I have an
index to reference.
I hope all of this makes sense, its been a long day and I'm excited I've
actually made a little progress.
Thanks guys,
Jim Coleman
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