My Bridgeport just died

Just as an important job comes in the Bridgeport has died. Looking inside the electrical box, one on the contactors has
started to fall apart. There is a row of three contactors at the top of the electrical control box. The top right contactor has lost a couple of small metal strips that make the contact. They look to have burnt through.
Since it just happened a 6 o'clock everywhere is closed, so no point in Googling for phone numbers until the morning.
Just a thought - anyone breaking a Bridgeport? Considering calling a couple of the re-building companies in the morning to see if they would be willing to sell the inside of an old control box.
Machine is 1969 model, cannot see any markings on the contactors so unable to track down any part numbers. The service manual shows no wiring diagram, which may have given part numbers.
Perhaps someone may be able to point me in the right direction?
Cheers
Lionel
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the electrical box, one on the contactors has

the electrical control box. The top right

They look to have burnt through.

Googling for phone numbers until the morning.

couple of the re-building companies in the morning

to track down any part numbers. The service

I'm sure you can bodge it back together with a bit of soldering and some copper strip. -- Dave Baker - Puma Race Engines (www.pumaracing.co.uk)
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wrote:

swap the phases over and stuff it in reverse and use the other contactor block -- Regards,
John Stevenson Nottingham, England.
Visit the new Model Engineering adverts page at:- http://www.homeworkshop.org.uk /
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On Tue, 07 Jun 2005 17:23:56 GMT, John Stevenson

Just had a quick look at my UK made 73 machine. This one doesn't use two contactors for fwd/rev but just one and relies on the switch for reverse.
http://photobucket.com/albums/0903/registered_user/?action=view&current=bridgycontactor.jpg
Mine has 4 contactors top left is motor, next is un-used, next is power feed at top right and coolant is bottom left.
In my case if the contactor went pear shaped I could always use the second one along. Mine are Klockner Mueller but can't see what coil voltage. there is 110v, 48v and 24v in the cabinet so that won't help.
-- Regards,
John Stevenson Nottingham, England.
Visit the new Model Engineering adverts page at:- http://www.homeworkshop.org.uk /
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has
morning.
morning
service
http://photobucket.com/albums/0903/registered_user/?action=view&current=bridgycontactor.jpg
Thanks John,
It's the top right contactor that has disintegrated, since I don't have power feed it's not needed. What happened earlier this evening was as soon as I plugged the machine in and turned on the grey box on the wall, the RCD tripped in the fuse box.
When I looked earlier the right hand top contactor had a couple of the brass strips missing. Just been out and had another look, blew the airline in the contactor and it lifted out a couple more bits of broken strip.
Plugged the machine in and it runs now. If I get any more problems I notice all the top contactors are all linked together with the feed going in each contactor in turn. If I remove the feed going into the bottom of the right contactor this should isolate it prevent any more problems.
Dave don't have time to strip down the old contactor and fix it. I did not realise that some of the contactors are not used, I did wonder why there were so many. I guess one is for the slotting attachment when fitted, and the other for power feed like John said.
Thanks for you help, I can get back to work in the morning and catch up.
Lionel
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Lionel

We as a get you out of trouble for a while you could use the reverse contactor, and swap two of the phases on the motor (or at the contactor) to get you forward direction.
That is, assuming you dont want to reverse or run in back gear<g>
I probably got a whole stack of 110V coil contactors here somewhere.
Wayne.....
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Wayne M Weedon Email: snipped-for-privacy@fdos-design.com
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Wayne Weedon wrote:

There are a couple of tapping jobs where I reverse out, but not the present job. I don't have a wiring diagram to tell me which contactor does what.
The left one goes to the socket for the motor plug at the top of the control box.
The layout is the same a the jpeg that John Stevenson just posted, one exception, where he has three white circles in the centre right by the door lock, mine has three larger cartridge fuse holders.
It seems to be the top right contactor that was causing the problem. After removing the broken bits everything seems to work OK now. Switch on the spindle and the reverse switch is reversing the motor, suds works, and the light is one. The broken bits must have been tripping out the MCB's somehow.
Thanks for your comments
Lionel
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Terry Braithwaite of Braithwaite Machine Tool Rebuild is a Bridgeport specialist. Some of you might have seen him at various ME shows?
He is based in Bridlington (as I am) and may be able to help..
His numbers are:
(All code 01262) - 606691 or 674466 or 604008 (home)
If you have trouble contacting him (no pun intended) drop me an e.mail and I will nip round and have a word....
Regards
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Pat Martindale

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writes

That was one of the companies that I was thinking of calling, I've seen their advertising in some of the trade magazines. I was going to ask if they would sell the internals from an old Bridgeport, as I guess when they do rebuilds they scrap the old electric's?
Do you know the guy well enough to ask if he would do this? It would be handy to have a couple of spare contactors.
Thanks
Lionel
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Lionel, I rang this morning. Terry is away in Nuneaton today but his mate says that they should be able to help you out. I have said that you will contact them direct if you wish to proceed....
I know Terry only through seeing him at trade shows - I do not have a Bridgeport so have no need for his "professional" services. As I am secretary of a model engineering Society he knows who I am but again, I do not know him all that well. Well enough to stop for a chat but that is all...
Hope this helps..
Regards,
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Pat Martindale

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writes

I will give him a call next week. Many thanks for your help. Much appreciated.
Lionel
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