I've gotta Rockwell abrasive belt finishing machine (6x48 belt sander model
31-520) and I want to change a 3 phase motor out to a single phase. The original Rockwell (Baldor) motor that I pulled out does not have any info on the frame number. Anyone have one of these or knows what frame number I need? I know I can take it to a local motor shop but I'd like to shop it on the web to know what to expect to pay before I do that.
I took a look on OWWN and they do list Rockwell/Delta part numbers, but no specs including frame number. I should have stated that I am looking for a replacement that is not necessarliy a Rockwell motor as I have seen they tend to be pretty expensive. That is why I'm looking for the general specs on the motor, which I've found all but frame info.
Looks like you have a semi-proprietary mounting pattern. The Delta catalog calls the motors out as being either a No. 6 or a No. 8 1/2 (Delta mounting patterns).
You have a couple of choices. Drill the cabinet (not too big a deal really) or make a pad to go between the motor and the cabinet base (an inbetweener) with some T-nuts facing one way to match the hole pattern in the new motor (any 1 horse 3450 rpm will do) and T-nuts going the opposite way to match the holes in the cabinet.
Sorry. Wishing it was easier. On the other hand, you do have one of the finest 6" X 48" belt finishers money could/can buy.
I sent you an e-mail yesterday saying that I would check out my motor size. I didn't actually look at the frame number, It was in a difficult position to read. However, it appears to be the same size as my original band saw motor, which I believe to be a 66Y frame type. They are both double ended, with cover nipple on opposite end. It makes it easy to reverse the rotation. On three phase motors, swapping any two leads will acheive the same thing.
They are slightly larger than todays norm. It didn't cause any problem when swapping my band saw motor. I just boosted it up slightly higher to make up for the difference. As I have not pulled the pulley, I don't know the shaft size. My band saw was 3/4" and now is 5/8". They make bushings to adapt the larger pulley to the smaller shaft. I don't think it works quite as well in the opposite direction.
Anyway, my motors are Rockwell/Marathon, not Baldor. My point is that you probably don't need to be overly concerned with getting the exact size as long as you don't go bigger than your stand can handle. There is plenty of room to play with when you are using belt driven machinery. (To the best of my knowledge)
HomeOwnersHub website is not affiliated with any of the manufacturers or service providers discussed here.
All logos and trade names are the property of their respective owners.