The Craftmans Shop > New from Old

Bridgeport J Head Pancake Motor

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awemawson:
Thanks for your thoughts chaps - much appreciated. It's very cruel that a dogs life is so much shorter than a human one. The puppy of course was a planned 'continuity' but poor old Cleo should have had at least another couple of years.

awemawson:
I had another go at trying to remove the motor stator from it's cast blind housing. I'd tried the other day using warming to give differential expansion but it's not easy to not over heat the wiring.

So today I tried with a reverse assembled three leg puller. Now there is VERY little of the stator stampings for the puller to grip, and the claws are awfully close to the windings, so care is needed. Trying to hold the three legs in the correct place AND tighten the puller with my four hands proved impossible, but then I hit on the idea of cutting suitable wooden wedges to hold the legs outwards leaving me a free hand for the spanner.

Eventually I got it in what I considered a safe place and started winding. The result ? Edge of the stampings rounded over and there was NO movement.

. . . hmm . . this is proving a bit of a pain!

hermetic:
Andrew, could you use a hot air gun, or even a torpedo diesel heater with the stator on a weld positioner turntable to keep the heat even, then even heat for say 5 minutes, and then try the extractor again? you will note that I am assuming you have this kit!
Phil

Muzzerboy:
I thought you'd be able to push the stator out by removing the end cover as well as the front plate. Can't make out what the stator assembly looks like from the photos. Is there a reason you need to pull rather than push?

I'm back home now and have dug out the motor I took from my original (Taiwanese clone) Bridgeport. Slightly more sausage than pancake and dual voltage rather than dual speed but otherwise looks pretty similar.

If you are still up for it, I'll wrap it up tomorrow and get it off to you Monday.

I'd post some pics but I get the error message "Your attachment couldn't be saved. This might happen because it took too long to upload or the file is bigger than the server will allow." Can't imagine this is a novel problem - what's the fix?

awemawson:
Hermetic I can get it evenly warm with a propane torch, but as the stator is in intimate contact it warms also, and rapidly you get to the point where they are much the same temperature!

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