Now that the old system cabinet is no more and everything will live up in the display console cabinet, I need to reroute the wiring between the motors, switches, solenoids etc and the console. Ideally the cable groups need to be protected in some form of conduits. The servo motors already have flexible, steel-armoured conduits and there is the old plastic conduit that used to run form the cabinet to the console. The latter can be reused to connect the cables from the head. There's a handy diecast box that used to be bolted to the rear of the console to receive the plastic conduit. With a couple more holes it can also receive the motor conduits. Obviously I kept the glands and gland nuts from the various conduits.
The motor conduits are the wrong lengths. The Y axis one now needs to be long and the X axis one now needs to be short with the new layout. Because they used to run to the base of the cabinet, that used to be the other way round.
My first thought was to swap the conduits across - but the cables inside are a very tight fit. God nose how they pulled them through in the first place. Well, with difficulty I suppose. Also the wires themselves are too short. They would emerge from the conduit but be too short to do much else.
Second thought was to open the junction boxes on the motors and swap the harnesses over. But the encoder cables are routed through the guts of the motors and have a 9-way D connector on the end so that would be messy. I've got a life to live and it doesn't involve endless and unnecessary soldering.
In the end it was a simple matter to swap the entire motor / harness / conduit between the X and Y axes. The motors, pulleys and mounts are identical, as are the connections. The only change I made was to swap the junction box orientation on the Y axis motor to avoid the conduit having to make a 180 degree bend before heading up to the console.
Job done.
Retrofitting 1983 Shizuoka AN-SB CNC milling machine, Bridgeport mill, Colchester Bantam lathe and 1982 Tree UP-1000 CNC lathe with modern controls - and other workshop stuff
Saturday, 1 April 2017
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