The Craftmans Shop > New from Old
The Sequel - Oh Blimey I bought a CNC Lathe (Beaver TC 20)
awemawson:
This afternoon I reverted to my original SMCC card (the servo subsystem card that drives the turret via Siemens power amplifiers)
Initially the turret would unlock by driving the tool disk forwards, but when rotated wouldn't re-lock when driven back due to angular error. Driving it to the correct position by manipulating the lock / unlock solenoids and physically turning it, it then would settle back and I was able to select tools by program.
I get the impression that the positioning is not spot on as the re-coupling of the curvic coupling is a bit hesitant. I came to the conclusion then that the output stage of the SMCC controller had a small error offset due to a hardware issue.
OK this where I was a couple of years back before shingles destroyed my brain. I have sourced another SMCC card that was in another Beaver TC20 lathe but that one was controlled by a Fanuc PLC. Reading it's internal program it is virtually the same as my one only differing in a couple of lines but these are to do with addressing the card so probably crucial.
My attempts at programming these cards in the past have drawn a blank - more research needed.
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