Hello
I am slowly working towards changing my spindle bearings for my ESM-59. I have not done such a thing before, so I could use advice.
There is currently too much vibration (resonances) and it runs a bit loud. The concentricity and runout I think are not very good. Concentricity is about 0.002" to 0.003". For the resonances, I was hoping it was the DC motor. I ran it without the belt and it had resonances. I replaced the bearings on the motor and now it runs great. Now I can clearly hear the noise from the spindle. Before it was coming from everywhere.
I looked at the documentation that came from the previous owner. There is a hand drawn blue print of the headstock. It shows two bearings, one on each end, with an OD of 90mm, ID of 55mm and width of 18 mm. Can anyone confirm that this is the correct size?
Some of my documents are for an ESM59 and some for a DSM-59 so I need to be careful. I could take it apart and really know for sure.
I hoped to order the correct bearings, then take it apart and install to reduce down time.
In my stuff that came with the lathe there was an 40mmx80mmx18mm bearing ABEC1. That concerns me in that it is a different size. Its an ABEC 1 which would not be suitable. So maybe it has nothing to do with the spindle.
Looking at bearings to get, I see this one (see below) (comes in a pair) and not cheap as unfortunately I expected. Does this look like a good (hopefully great) bearing for this application? In the draft I have it does not show any tilt in the contact angle. 15 degrees seems like a good idea, I would set them up to oppose each other I think.
Thanks,
Jan
55BNC10S Nachi high precision Angular pair of Ball Bearings with 15 degrees contact angle and Polyamide resin cage, pair of ball bearings are 2 duplex bearings, bearings are ABEC-7 (P4) quality and made in Japan.
Item: 55BNC10S Nachi Ball Bearings
Type: Nachi Angular Ball Bearings
Cage: Polyamide resin cage
Quality: ABEC-7 (P4 quality)
Dimensions: 55mm x 90mm x 18mm/Metric
Bearing Inner Diameter: 55mm
Bearing Outer Diameter: 90mm
Bearing Width: 18mm
Size: 55 x 90 x 18 mm
Quantity: One Bearing
Dynamic load rating Cr: 56,000 N
Static load rating Cor: 57,500 N
Limiting Speed:
Grease Lubrication: 8,800 RPM
Oil Lubrication: 12,000 RPM
Made in Japan
I am slowly working towards changing my spindle bearings for my ESM-59. I have not done such a thing before, so I could use advice.
There is currently too much vibration (resonances) and it runs a bit loud. The concentricity and runout I think are not very good. Concentricity is about 0.002" to 0.003". For the resonances, I was hoping it was the DC motor. I ran it without the belt and it had resonances. I replaced the bearings on the motor and now it runs great. Now I can clearly hear the noise from the spindle. Before it was coming from everywhere.
I looked at the documentation that came from the previous owner. There is a hand drawn blue print of the headstock. It shows two bearings, one on each end, with an OD of 90mm, ID of 55mm and width of 18 mm. Can anyone confirm that this is the correct size?
Some of my documents are for an ESM59 and some for a DSM-59 so I need to be careful. I could take it apart and really know for sure.
I hoped to order the correct bearings, then take it apart and install to reduce down time.
In my stuff that came with the lathe there was an 40mmx80mmx18mm bearing ABEC1. That concerns me in that it is a different size. Its an ABEC 1 which would not be suitable. So maybe it has nothing to do with the spindle.
Looking at bearings to get, I see this one (see below) (comes in a pair) and not cheap as unfortunately I expected. Does this look like a good (hopefully great) bearing for this application? In the draft I have it does not show any tilt in the contact angle. 15 degrees seems like a good idea, I would set them up to oppose each other I think.
Thanks,
Jan
55BNC10S Nachi high precision Angular pair of Ball Bearings with 15 degrees contact angle and Polyamide resin cage, pair of ball bearings are 2 duplex bearings, bearings are ABEC-7 (P4) quality and made in Japan.
Item: 55BNC10S Nachi Ball Bearings
Type: Nachi Angular Ball Bearings
Cage: Polyamide resin cage
Quality: ABEC-7 (P4 quality)
Dimensions: 55mm x 90mm x 18mm/Metric
Bearing Inner Diameter: 55mm
Bearing Outer Diameter: 90mm
Bearing Width: 18mm
Size: 55 x 90 x 18 mm
Quantity: One Bearing
Dynamic load rating Cr: 56,000 N
Static load rating Cor: 57,500 N
Limiting Speed:
Grease Lubrication: 8,800 RPM
Oil Lubrication: 12,000 RPM
Made in Japan
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