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Servo Driven 4th Axis for CNC Mill

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awemawson:
Then of course the other end. This cover is oil filled within, but there was no gasket or other sealing, so it went back with a smear of Blue Hylomar which is usually pretty good stuff

awemawson:
Next in sequence needs to be the brake assembly, so I can't put off deciding what to do with the broken bit. I think that it is probably a steel forging - could be cast possibly but it's steel not cast iron.

I decided to silver braze it first - if it proves not to be strong enough the fall back plan is to turn off the end, axially drill and tap it, and bolt a cheek on the end. Bally awkward thing to clamp. I ended up 'buttering' both parts with silver braze, holding one in the vice and the other in pliers and putting them roughly together, letting it cool a bit, then clamping them together with extended mole grips and re-melting. It's important to not only keep the alignment but minimise the thickness of the joint. The silver braze will absorb some of the steel and alloy with it if thin enough.

awemawson:
Although the brazed joint is nice and even, the operating 'face' of the shoe isn't perpendicular to the shaft as it should be. The part must have bent before it broke. I'll skim the face tomorrow - the intermittent cut will show if it's just stuck on with flux or has properly brazed  :lol:

 . . so onwards and upwards !


Andrew

awemawson:
So up early and skimmed the brake shoe. Happily the brazing stood up to the intermittent cut - ended taking about 45 thou off both sides. Remains to be seen if it stands up to working conditions !

Andrew

awemawson:
So - now to re-assemble the brake and see if it works.

Here's the assembly:

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