The Siren Board

The stator ripped in two. Look at the second pic in the first page.

TboltTX1 wrote:I wonder if it would be possible (or practical) to find a machine shop that can make a new motor shaft and just move the old armature and rotor over to the new shaft?

Edit: Looking back at your last photo it appears the motor has separated a bit from the base plate. It may be prudent to take the motor over to a shop and see if the field and frame is still intact before trying to salvage it.

Does the rotor or stator have any cracks from the fall?

Τhe stator is broken into 3 pieces with 3 'teeth' cut. Since I have all parts and they perfectly match, I believe they can be welded. Fortunately the rotor is in perfect shape. Two out of three screws that hold the motor to its base have been cut. Maybe the shaft's lower end is bent as well, or the bearing came off its housing partly. From what I can see, the armature doesn't look to be burnt. We'll find out soon. The first thing to do is to pull out the rotor. Any ideas on how to deal with the shaft key? What type of puller would fit?

Steering wheel puller works best for that, use grade 8 bolts and penetrating oil to get it loose.

stormsetter4 wrote:Steering wheel puller works best for that, use grade 8 bolts and penetrating oil to get it loose.

Thanks. I'll try to find one, they seem to be pretty expensive. What about the shaft key? Do I need to remove it before pulling the rotor, or will it follow?

When i removed one of my rotors, the shaft key came with it, but it it doesn't budge then you might have to remove it.

The first attempt to pull out the rotor was sort of disastrous! I had a (bad) idea to fasten washers so the two legged puller would grip. You can see below the result... The inner threads were broken and the screws came out. I'm afraid that with the steering wheel puller I would have the same result... Of course the rotor didn't move at all.

Not sure how much of this is any use now but I'll put it out there anyway. When I did my siren I used two lifting grade eye bolts and removed the lower arms of the puller. I put the eye between the upper arms on each side and placed the bolt through the hole in the eye. I also drilled the shaft key , apploed PB blaster and also let it sit overnight under tension. It came loose after I heated it with a propane torch.

Wdr wrote:Not sure how much of this is any use now but I'll put it out there anyway. When I did my siren I used two lifting grade eye bolts and removed the lower arms of the puller. I put the eye between the upper arms on each side and placed the bolt through the hole in the eye. I also drilled the shaft key , apploed PB blaster and also let it sit overnight under tension. It came loose after I heated it with a propane torch.

The eye bolts are actually a good idea, I haven't thought of. I don't know though if the rotor threads are going to tolerate the lifting pressure after the previous experiment. In the meanwhile I disassembled the motor base plate. The motor winding seems to be in perfect condition.

Yeah, I don't really remember but I think I was actually pretty conservative with the tension on the puller. The holes on mine seemed loose on the bolts and one actually had already been re tapped to a larger thread, which might work for you worst case.

Would some force from behind the chopper help bring it off?