The Craftmans Shop > New from Old
Bridgeport J Head Pancake Motor
awemawson:
Murray yes please I am VERY MUCH ‘on’ for your motor please, it’s so frustrating not having the Bridgeport, with it going I could make a better extractor.
The aluminum motor housing is all cast as one piece, the top doesn’t detach sadly so it has to come out downwards.
Given the Bridgeport working I could theoretically drill some strategically placed holes in the top to drive the stator out, but I’m not going to risk that with a hand held drill.
I much look forward to receiving your motor !
awemawson:
So thanks to Murray I have received a single speed 'Pancake Motor' for my poor old Bridgeport.
It's spindle is 22 mm but my pulley is 19 mm so the first job was to bore it out on the lathe - sorry no pictures.
Then it has a 7 mm key way and my (Imperial) broach set obviously doesn't include 7 mm so the next job was to file up a 7 mm key and grind a shaping cutter to fit in a boring bar to shape a suitable key way in the pulley using the lathe and manual long feed - again sorry no pictures.
Then my Bridgeport mounts the motor on two 1/2" UNC studs, one as a pivot and the second in a slot for belt tightening, so having first offered up the front plate of my original to the mounting holes on Murray's motor (which are plain 10 mm holes) to check absolutely that they have the same mounting centres I drilled and tapped them out to 1/2" UNC to fit my studs - I then placed the motor on the machine to prove all fits - it does!
OK now I need to sort out the electrics - my original motor had a housing for a 5 way switch (fast fwd/slow fwd /off slow rev / fast rev) - this one just has a pressed terminal box - the switch must have been elsewhere on the machine and only sadly needs to be three way being single speed.
RSComponents provided a suitable three phase reversing switch and I drew up a suitable box to house the new switch and replace the terminal box. Cutting it out on the Plasma Cutter proved a bit of a pain - I've still not got it fully configured since my Windows 7 debacle - but at last I ended up with a 'flat box' just needing bending.
Like a twit I failed to realise that my narrowest finger on my folder was wider than the narrow dimension of my box - no problem if you bend the narrow bit first, but if you don't . . . . . :bang:
As an attempt to recover the situation I tried sawing a 'bend here' cut but rather as I expected the result wasn't acceptable. Never mind - cut another 'flat box' on the CNC plasma and do it right this time - which I did :ddb:
OK Box and lid bent up, all the right holes drilled for mounting it on the motor, and to take the switch and the 20 mm entry grommet - time for a trial assembly. It all fits but the wiring is going to be a bit tight but should work oOK.
I've dis-assembled it for painting - (tasteful shade of satin black) and will try and fit it all together tomorrow.
John Rudd:
Looking good so far....👍
Are you going to repair the original motor? :zap: :dremel:
awemawson:
John so far it’s resisted all my efforts to pull the stator from the casting. The fault is probably on this inaccessible side of the stator (upper in use) as apart from those three turns that have scrapes the lower side looks good.
Interestingly the single speed motor has a removable top cover so the stator could be driven out, but the two speed is a single aluminium casting (different makers)
Muzzerboy:
Good to see this thing getting a second life. Glad it seems to fit OK.
Must say, I like the idea of a CNC plasma cutter. What did you use to create the sheet metal design?
Yes, I assumed yours would also have a removable top cover. Would have made stator removal easier (possible?).
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