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Question on electric motor repair.

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F14

10-29-2000 11:36:59




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My DeWalt 14" chop saw started squealing real bad as it spun up or slowed down the last time I used it. Took it apart expecting to find a dry bearing. What I found was that the cooling fan has come loose and is spinning freely on the shaft.

My plan is to mix up a batch of JB Weld, and tuck a little bead around the collar of the fan and epoxy it back onto the shaft. Two questions:

1. Do ya think it will hold okay?
2. How careful do I need to be to get the epoxy spread evenly so as not to unbalance things?

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Robert H. Galloway

11-01-2000 07:41:17




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 Re: Question on electric motor repair. in reply to F14, 10-29-2000 11:36:59  
I'd expect the JB Weld to do fine if the fan is still a close fit to the shaft. Slide the fan away from its seat, coat the shaft all round, slide the fan back. Rotate is a turn or two to distribute the JB Weld. Carefully turn the armature and fan together to make sure it's running true with no wobble.

bob G.



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JayCee

02-26-2001 11:23:05




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 Re: Re: Question on electric motor repair. in reply to Robert H. Galloway, 11-01-2000 07:41:17  
A related question: I have a craftsman direct drive e-mower with a bad motor. I replaced the brushes but it still sparks and spits. Should I change the armature or the circuit board next? Can I test them? Both "look OK".



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F14, with update

11-01-2000 06:29:47




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 Re: Question on electric motor repair. in reply to F14, 10-29-2000 11:36:59  
I pre-cleaned with alcohol and laid a small fillet of JB Weld between the fan collar and the shaft, let it set up for 24 hours.

Put it back together last night and spun it up a couple of times. Seems to be dandy. We'll see how long the repair lasts.

Thanks for the tips.



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Fred OH

10-31-2000 04:04:19




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 Re: Question on electric motor repair. in reply to F14, 10-29-2000 11:36:59  
Didn't see anyone mention a product named Loctite. If it'll lock threads, it should lock the fan. L8R----Fred



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Greg

10-30-2000 11:38:34




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 Re: Question on electric motor repair. in reply to F14, 10-29-2000 11:36:59  
IMOHO these DeWalt chop-saws are throw-aways anyway. How about just grabbing that do-it all MIG & throw a couple of spot-welds on it and be done with-it & get back to work. *grin*



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F14...Hmmmmmmmmm

10-30-2000 12:18:05




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 Re: Re: Question on electric motor repair. in reply to Greg, 10-30-2000 11:38:34  
I'd like to pursue this "throw-away" thing further. I paid a pretty fair chunk of change for the thing, based on shopping around for DeWalt prices and previous experience with DeWalt tools. I haven't had any of them long enough to set a baseline for longevity expectations, but so far, I'm pretty pleased. I have a 3/8 VSR drill, a compound miter saw, a biscuit joiner, a battery-powered trim saw, a 4-1/2 inch grinder, and a jig saw in addition to the chop saw. I've had them all for about 4 years, more or less, with fairly steady use on everything except the biscuit joiner and the trim saw. I replaced the cord on the grinder (insulation got kinda crumbly, due, I think, to debris and sparks from the wheel) and now the loose fan on the chopsaw. No complaints on anything else yet.

What experience have others had with DeWalt? Also, what would you consider to be a good chopsaw, and what would you expect to pay? I'm just a hobby user, might use it 2 or 3 times a month to make maybe a dozen or so cuts in relatively light materials.

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larry

12-29-2001 10:32:59




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 Re: Re: Re: Question on electric motor repair. in reply to F14...Hmmmmmmmmm, 10-30-2000 12:18:05  
looking for a wiring diagram to rewire both start capacitors and run capacitors in an old reliance 5hp motor motor has four start capacitors and four run capacitors it has open end frame with
two start switches

thanks



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Greg

11-03-2000 16:37:30




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 Re: Re: Re: Question on electric motor repair. in reply to F14...Hmmmmmmmmm, 10-30-2000 12:18:05  
"To pursue this 'throw-away' thing further."

The one DeWalt chopsaw that I used didn't last long enough to "set a baseline for longevity expectations." The bearings went out before three inches in diameter was used off the original wheel.

Any manufacturer can produce a "lemon". I am not a fan of DeWalt chopsaws or some of Black & Decker's tools. I've had bad experiences with the Black & Decker 4 1/2" Industrial grinders. The cords disinigrating at about the same age as yours. One grinder had had very little use.

My current chopsaw is a Chicago Electric industrial import that has exceeded my expectations for this saw. If I was going to replace it, I would be looking at the Milwaukees and the Porter Cable. Harbor Freight recently had the Milwaukee for about $160.

Hope your DeWalt lasts many years.

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F14

11-05-2000 13:44:07




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 Re: Re: Re: Re: Question on electric motor repair. in reply to Greg, 11-03-2000 16:37:30  
I've run probably a dozen discs thru this thing, and this was the first problem. I can't remember what I paid for it, but they list now for $199, which seems familiar. I don't call that a throw-away price. The bearings are like new in it, so hopefully I'll get some mileage out of it.



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Robert Galloway

11-01-2000 07:47:05




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 Re: Re: Re: Question on electric motor repair. in reply to F14...Hmmmmmmmmm, 10-30-2000 12:18:05  
In response to longevity. I've had a variable speed ROS for about eight years. The variable went out within the first couple of years. Rather than replace the controller, I just bypassed it. As a single speed ROS, it's still going strong with a lot of use. MTBW

bob g.



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Nathan(GA)

10-30-2000 19:16:47




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 Re: Re: Re: Question on electric motor repair. in reply to F14...Hmmmmmmmmm, 10-30-2000 12:18:05  
F14, I've been pleased with my 4 1/2" grinder and cordless drill. DeWalt is just a Black&Decker with a yellow suit on. I've got a cheap($109) chop saw made overseas. I haven't used it a bunch, but so far it's OK.



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Francis Z Beringer

12-01-2000 18:17:57




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 Re: Re: Re: Re: Question on electric motor repair. in reply to Nathan(GA), 10-30-2000 19:16:47  
Loctite makes a green product number 608 AND 609. This will make a permanent bond. Will take up to 7 thousands of play.



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Frank

10-30-2000 16:29:25




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 Re: Re: Re: Question on electric motor repair. in reply to F14...Hmmmmmmmmm, 10-30-2000 12:18:05  
The store I worked at sold Makita and Dewalt. We had fewer complaints with the Makita, but they were both good tools. Skil was another good one. I haven't had any experience with Milwaukee, but I've heard they are good. We had some trouble out of Ryobi and Clarke models. I think the JB weld would work just fine for this.



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MikeH-Tx

10-30-2000 11:02:11




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 Re: Question on electric motor repair. in reply to F14, 10-29-2000 11:36:59  
F14, I would try superglue. With the relatively tight fit between the shaft and the fan, it should be really strong.

Also, I wouldn't worry too much about JB weld unbalancing things. It can't weigh what a set screw would and they are used all the time to hold fans onto shafts (is there room for one?). In addition to being fairly light weight, the JB is very close to the shaft and uniform around it.

Maybe Superglue on the shaft with a JB Weld bead on each side?

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T_Bone

10-30-2000 22:13:23




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 Re: Re: Question on electric motor repair. in reply to MikeH-Tx, 10-30-2000 11:02:11  
Hi Mike, but remember that a set screw is "balanced" with the fan when it's made. Not as a add on piece.

T_Bone



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ltf in nc

10-29-2000 12:59:34




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 Re: Question on electric motor repair. in reply to F14, 10-29-2000 11:36:59  
I used JB Weld to bond a truck A/C blower fan back to the motor shaft with lasting results. Clean the shaft and adjacent area and liberally apply the JB Weld as uniform as possible. Give the epoxy time to cure. I do not think balance will be a problem.



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T_Bone

10-29-2000 11:54:12




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 Re: Question on electric motor repair. in reply to F14, 10-29-2000 11:36:59  
Hi F14, Have you tried buying a new fan from Dewalt as there usually not to expensive. I think you need to be very close to balance or the fan won't last very long. If it's in an area where if the fan comes off it won't tearup something else, you might get lucky.

T_Bone



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F14

10-29-2000 13:34:56




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 Re: Re: Question on electric motor repair. in reply to T_Bone, 10-29-2000 11:54:12  
The fan is third back on the shaft, behind a reduction gear and a bearing. It'd be a bear to get off.

The hub on the fan is still pretty snug, when it's slid up where it belongs, the fan doesn't wobble or anything. It's a stamped tin unit, looks like it was just crimped on and the crimp isn't gripping the shaft anymore. The repair will be right on the motor shaft, close to the center of rotation.

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Jim K

10-29-2000 16:22:03




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 Re: Re: Re: Question on electric motor repair. in reply to F14, 10-29-2000 13:34:56  
Never seen JB weld but if its a liquid epoxy use just enough to get the job done and you should be OK Jim K



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T_Bone

10-29-2000 19:23:53




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 Re: Re: Re: Re: Question on electric motor repair. in reply to Jim K, 10-29-2000 16:22:03  
Hi F14, I'd try the JB, since you described the location.

T_Bone



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