Servo Driven 4th Axis for CNC Mill

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awemawson:
As you can see, there is a cast 'shoe' on the shaft that is pulled up against the wormwheel to lock it. The shaft has an acme thread onto which a gear threads, which engages with a rack which is pulled up by an air cylinder triggered by a solenoid valve - simple really :bugeye:

awemawson:
OK now I'm in so far at least hopefully the rest of the mechanical side should be reasonably straight forward. Currently I can only rock the worm and wheel about two degrees - I suspect that a bit of the broken brake pad has got between them - so they'll have to come out for cleaning.

Watch this space . . . . . . . . :thumbup:

Andrew

Pete W.:
Hi there, Andrew,

There you are, you see. That wasn't so difficult, was it?!?! (To share it with us, I mean.) :D :D :D

Seriously, congratulations on your tenacity and ingenuity - I'm pleased you got a result and I hope the way forward is complex enough to be interesting but not so awkward it's frustrating. :thumbup: :thumbup: :thumbup:

awemawson:
Thanks Pete,

So quite a bit of progress this morning. Objective was to free the worm 'capsule' so that it could be swung out of engagement with the worm wheel.

First I attacked the drive end, removing the gear that engages with the servo motor, then a cunning micro backlash adjuster, and loosened the various locking devices:

awemawson:
Then I attacked the other end of the worm shaft. Turns out that the cover has an oil sight glass I'd not spotted before. It was all pretty gungy in there - obviously water based coolant had got in. When I managed to locate all the various locking devices, (and realised that some of the grub screws were two to a hole !) the worm capsule rotated nicely away from the worm wheel.

At this stage the worm would turn freely but the table was still only turning a few degrees, so obviously not foreign matter between the worm and wheel.

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