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  #1  
Old 02-25-2017, 02:31 PM
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Shade Tree Welder Shade Tree Welder is offline
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Default Welding Positioner Repair.

A good friend of mine needed his welding positioner to be repaired. So I owe
him a favor or two. So I took it and decided to take a run at it. The real
problem was the speed control was damaged and not repairable, I tried, no
luck.

So the speed control is in pictures 2 & 3. Picture one is the name plate on the
machine. My guess I that the positioner has been dropped a time or two. It
was purchased used and worked when purchased.

While I was attacking the main problem, I noticed the "high quality" welds on
the main frame, keep in mind this was manufactured in Michigan...
Pictures 4 & 5.
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Old 02-25-2017, 02:43 PM
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Yep the pot came apart. Can you remove that one and solder a new one on?

Or it might be a 20 dollar ebay part. Usually 120 in gets you a 90 volt dc motor. The motor probably has permanent magnets for the field and you only have A1 and A2 out or something like that.

Scott
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Old 02-25-2017, 03:27 PM
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Made in Michoacán?
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  #4  
Old 02-25-2017, 04:25 PM
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Quote:
Originally Posted by Scotts View Post
Or it might be a 20 dollar ebay part. Usually 120 in gets you a 90 volt dc motor. The motor probably has permanent magnets for the field and you only have A1 and A2 out or something like that.
Yup, you nailed it, and the 120V AC input get routed through the foot pedal first then to the speed control which has the rectifier in it some where.

Soldering in a new pot. is too much work unless the Speed control is stupid expensive, I should know Monday what parts cost.
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Old 02-25-2017, 06:33 PM
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Try crimping the pot back together?

Maybe they should have welded the welding positioner using a welding positioner...
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Old 02-25-2017, 06:39 PM
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My money is on "Stoopid expensive" for the board, and you'll be looking at
Ohmite (or other pot manuf) catalogs, come Tuesday....

The welds look to be "Hi-speed" welded....the shielding gas couldn't keep up....
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Old 02-25-2017, 07:24 PM
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Quote:
Originally Posted by mccutter View Post
Try crimping the pot back together?
10,000 miles ahead of you did not work.


Quote:
Originally Posted by digger doug View Post
My money is on "Stoopid expensive" for the board, and you'll be looking at
Ohmite (or other pot manuf) catalogs, come Tuesday...
Not my equipment, not my money...
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Old 02-25-2017, 07:25 PM
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I am going to test the motor with a battery first, just to make sure it is good.
Brushes are in great shape. The 2 amp fuse was also blown, so maybe the
board is fried too.
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Old 02-25-2017, 08:37 PM
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Quote:
Originally Posted by Shade Tree Welder View Post
I am going to test the motor with a battery first, just to make sure it is good.
Can you see the motor plate?
Chances are pretty good that that's a 90v dc motor (though it could even be a 24 or 36 volt) so a battery may not tell you anything.
Dc motors are notoriously tough. That's probably a 5k or 10k pot, commonly available. It would be a shame to trash the board without trying a new one.
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  #10  
Old 02-25-2017, 08:46 PM
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Quote:
Originally Posted by cutter View Post
Can you see the motor plate?
Chances are pretty good that that's a 90v dc motor (though it could even be a 24 or 36 volt) so a battery may not tell you anything.
Dc motors are notoriously tough. That's probably a 5k or 10k pot, commonly available. It would be a shame to trash the board without trying a new one.
Yes 90 volt.

There are rivets on the board, so disassembly and reassembly is not easy. Not putting extra work in to it I don't have to.
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