Hello All,
So I have replaced the spindle bearings of my ESM-59. That worked out very well.
I have had a problem with my DC motor that is originally came with (Eaton WC 1002 G640
1 HP 1750 RPM 90V DC motor).
I had replaced the bearings on that, and it did improve things but in the end, it always had a vibration, resonance at 50% speed and more above that. Then when running, connected to the lathe it made the whole table and lathe shake. I measured the runout on the motor shaft and it seemed too large.
I decided to get a new DC motor with what I thought were the same specs, and thought that this would resolve all the trouble.
Rookie mistake? So I ordered a Leeson model 108022.00, 1HP, 1750RPM, 90V DC motor. This motor now spins
without resonances but it seems much louder. There is always a very loud transformer hum.
Is that the fault of floppy windings in the new motor? I did not measure how loud the Eaton was, but this one, I set my cellphone 6 ft away and measured 55dB when it just starts spinning and then it quickly goes to 60 dB and stays there for the rest of the RPM range. Looking at the noise peaks they are all harmonics of 120 Hz.
Is it a problem of my motor speed controller? It is a Dayton 2M171E SCR controller.
Is that just the way it is?
What are solutions?
Wear ear protection?
Put a box around the motor?
somehow decoupling the motor from the table (it is rigidly mounted to the bottom of the wooden tabletop)?
change the supply?
Adjust something in the supply?
other?
How loud are your small lathes? 60dB at 6ft?
Thanks
So I have replaced the spindle bearings of my ESM-59. That worked out very well.
I have had a problem with my DC motor that is originally came with (Eaton WC 1002 G640
1 HP 1750 RPM 90V DC motor).
I had replaced the bearings on that, and it did improve things but in the end, it always had a vibration, resonance at 50% speed and more above that. Then when running, connected to the lathe it made the whole table and lathe shake. I measured the runout on the motor shaft and it seemed too large.
I decided to get a new DC motor with what I thought were the same specs, and thought that this would resolve all the trouble.
Rookie mistake? So I ordered a Leeson model 108022.00, 1HP, 1750RPM, 90V DC motor. This motor now spins
without resonances but it seems much louder. There is always a very loud transformer hum.
Is that the fault of floppy windings in the new motor? I did not measure how loud the Eaton was, but this one, I set my cellphone 6 ft away and measured 55dB when it just starts spinning and then it quickly goes to 60 dB and stays there for the rest of the RPM range. Looking at the noise peaks they are all harmonics of 120 Hz.
Is it a problem of my motor speed controller? It is a Dayton 2M171E SCR controller.
Is that just the way it is?
What are solutions?
Wear ear protection?
Put a box around the motor?
somehow decoupling the motor from the table (it is rigidly mounted to the bottom of the wooden tabletop)?
change the supply?
Adjust something in the supply?
other?
How loud are your small lathes? 60dB at 6ft?
Thanks