I have been refurbishing a South Bend 13 for about a year now. I have the lathe running but am not satisfied with the sound of the motor. There is a high-pitched whine that I can't hear, but it bothers the heck out of my wife as it seems to penetrate through the whole house. (I mostly can't hear this sound because of loss of high-frequency hearing, but I can record it and see it in spectral analysis.)
The motor is a Reliance (later bought out by Baldor) 2HP 3PH. I am running it with a cheap VFD from Amazon (XSY-AT1). I don't have a means of powering the motor other than through the VFD. I have taken it back out of the lathe and have it running with the VFD on my bench. I have verified that the noise comes from the motor, not the VFD or any other part of the lathe.
I originally thought the motor bearings were OK and didn't replace them. However, since I have this noise, I decided to preemptively replace them - just in case that makes a difference. When I pulled the bearings out of the motor, I discovered that one end had a spring and a plate in the bearing cup, while the other end has a spring, but no plate. Here are the parts I found:
http://www.mikelitzkow.com/wp-content/uploads/2022/01/20220114_094424.jpg
I can't find any parts diagrams or other information on this motor. Here is the data plate:
http://www.mikelitzkow.com/wp-conte...amScanner-01-14-2022-07.39-e1642178898770.jpg
My question is whether anybody knows if both bearings should have a plate associated with the spring? Maybe somebody took the motor apart before me and lost that part? Maybe the extra end-play causes the noise? Or maybe, it's time to "bite the bullet" and buy a rotary phase converter? Any and all advice on how to get rid of this noise will be appreciated.
The motor is a Reliance (later bought out by Baldor) 2HP 3PH. I am running it with a cheap VFD from Amazon (XSY-AT1). I don't have a means of powering the motor other than through the VFD. I have taken it back out of the lathe and have it running with the VFD on my bench. I have verified that the noise comes from the motor, not the VFD or any other part of the lathe.
I originally thought the motor bearings were OK and didn't replace them. However, since I have this noise, I decided to preemptively replace them - just in case that makes a difference. When I pulled the bearings out of the motor, I discovered that one end had a spring and a plate in the bearing cup, while the other end has a spring, but no plate. Here are the parts I found:
http://www.mikelitzkow.com/wp-content/uploads/2022/01/20220114_094424.jpg
I can't find any parts diagrams or other information on this motor. Here is the data plate:
http://www.mikelitzkow.com/wp-conte...amScanner-01-14-2022-07.39-e1642178898770.jpg
My question is whether anybody knows if both bearings should have a plate associated with the spring? Maybe somebody took the motor apart before me and lost that part? Maybe the extra end-play causes the noise? Or maybe, it's time to "bite the bullet" and buy a rotary phase converter? Any and all advice on how to get rid of this noise will be appreciated.