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Servo Driven 4th Axis for CNC Mill |
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awemawson:
Having traversed the front of the machine the 20 mm flexible conduits terminate, along with many others, in the wall of the electrical cabinet. From there for now they stop on a DIN rail mounted terminal strip, from whence they will be wired to the rest of the machine. Exceptions being the Heidenhain encoder, that goes directly to the TNC355 controller in it's rather special 4 pair twisted screened cable, and also the tachometer output which goes directly to the Bosch servo card in screened twisted pair |
awemawson:
At long last the pneumatic valve has arrived allowing me to make up a bracket and mount it. I'm glad to say that the brake works very well. In the relaxed state the cylinder is releasing the brake, and when powered it is applied |
awemawson:
I then could start planning how to physically fix the ends of the umbilical flexible conduits that lead from the 4th Axis to the termination box. I decided that the easiest thing was to replace the SEM servo motor termination box with a much larger one that could take the Adaptaflex fittings, and also the air fitting, so went too and made a new box: |
awemawson:
Now that all went very well, I was pleased with the result . . . until I realised that due to the minimum bend radius of the flexible conduit the 4th Axis could not be layed down in 'rotary table' mode :bang: Now I'm unlikely to want to use it as a rotary table, but will want it sat that way for initially mounting chucks and the like, so a re-think was needed. I could have brought the cables out on the rear of the box on the narrower side, but that would have made the 4th Axis too long and the cables would foul on the enclosure door. I fell back to using the original SEM termination box with the cable emerging 'backwards' so that the curve could be accommodated, and making up a bracket for the second conduit which I had to reduce to 16mm to clear the body of the motor |
awemawson:
The transformer to drive the Servo motor and card has arrived, and this and that 'wandering choke' will now be mounted alonside the original transformers on the base of the electrical enclosure |
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