Need help on the motor from a 1942 Delta drill press

[geomagno]

Stripping apart my granddad's Delta 17-7509 so I can clean it up and paint it. The bearings on the motor are really sticky and I plan to replace them. But when I got one side of the motor body apart, the rotor came out and (I think) broke this copper piece. Can anyone identify it and tell me what it's for?
Looks like there is a contact on one end, and the middle of the ring is worn very thin in 2 places. Not sure where it makes contact on the rotor and what happens when contact is made (cutout?).
Never seen this so not sure how to proceed, especially if I have to replace this old part. Attached is a photo of the part in place and taken out, as well as the rotor, and motor name plate. Appreciate the help.

[/url]Delta Milwaukee drill motor ring1 by back2denali, on Flickr[/IMG]

[/url]Delta Milwaukee drill motor parts1 by back2denali, on Flickr[/IMG]

[/url]Delta Milwaukee drill motor rotor by back2denali, on Flickr[/IMG]

[/url]Delta Milwaukee drill motor tag by back2denali, on Flickr[/IMG]

 

[454ragtop]

That's the centrifugal switch, used to start the motor. Best to ask here http://www.owwm.org/viewforum.php?f=82

 

[Davefr]

Yes, that's the centrifical switch. At low speeds in keeps the start winding in the circuit. When the motor comes up to speed it releases the switch (where it's broken) and that disengages the start winding.

It looks like the break is in the critical area that rides on the plastic collar that actuates the switch. It could have been badly worn before you disassembled the motor. (especially if the bearingd were bad and the motor never came up to full speed)

Try the OWWM BOYD forum but finding that exact part or Frame 165 motor could be tough. You could try to fabricate that part but it might not hold up.

Plan B would be to use a common NEMA 56 motor but you'd probably have to modify your motor mount.

 

[lilredex]

I'd repair that piece. Looks like a bump up where the part has worn through, take some measurements of the raised height.

Cut some copper pieces to fit under the breaks and solder them in (with an iron). Some solder build up will allow you to sand down the repair to about the original height. It only switches off the start winding as above.

If you have an (electrical) motor repair shop close by, you might pay them a visit........you never know.

Clean up those switch contacts also.

 

[Packard V8]

Since it's broken, trying to fix it can't hurt. If you don't succeed, a Delta 1/3hp split phase motor is not unobtanium. I wouldn't pay more than $20 - $25 for one.

jack vines

 

[geomagno]

Thanks for the tips folks. Would really like to keep this motor since it's a pass-down. Think I'll ask around on soldering the ring on the centrifugal switch, if not then replacement.

Since it's broken, trying to fix it can't hurt. If you don't succeed, a Delta 1/3hp split phase motor is not unobtanium. I wouldn't pay more than $20 - $25 for one. jack vines

If I can find one at that price it would definitely make replacement more comfortable. Thanks.
.
.

 

[454ragtop]

Really should ask over at owwm.org. All the Delta/Rockwell nuts/experts hang out there, more than likely someone has run into this before.

 

[geomagno]

Really should ask over at owwm.org. All the Delta/Rockwell nuts/experts hang out there, more than likely someone has run into this before.

Will do. Thanks

 

[Zeke]

I would suggest using a higher temp silver solder. Available at the welding supply, some hobby shops, online, etc. Get the flux that goes with what you buy from 5% to 50% ( 50% unnecessary)