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Old 10-11-2018, 01:43 PM
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Default Saw Arbor - Is one wave washer enough?

Hey, all,

I have a table saw (Powermatic 64A) whose arbor bearings went. I took it apart and am ready to reassemble with new ball bearings but had a question.

The assembly as I disassembled it bore only a vague resemblance to the drawing Powermatic provided in their owner's manual (which also named the wrong bearing and failed to note LH threads on some, but not all, parts) and they have been cluelessly antagonistic on the phone, so I figured I would ask here:

This arbor shaft arrangement contained one, but only one, wave washer as shown below:

My questions are:

1. Is just one wave washer enough in this application (1.5 hp table saw)?
2. Shouldn't there be a second wave washer under the second (right-hand) ball bearing at position "A"?

(The owner's manual shows no wave washers at all, but does show other parts that are absent. I bought the saw new 20 yrs ago, and this portion of it was already assembled when I received it, so it's not an issue of some dummy assembing it wrong, unless that dummy was in Taiwan.)

Thanks in advance for any clues.
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Last edited by Wolfram; 10-11-2018 at 01:56 PM.
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Old 10-11-2018, 03:08 PM
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1 wave washer is probably enough it's purpose is to allow clearance for the bearings as the shaft heats from prolonged usage.
what you do not want is the blade moving as the shaft heats.
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Old 10-11-2018, 03:39 PM
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It looks like they are calling a wave washer a retaining ring
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Old 10-11-2018, 04:22 PM
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Quote:
Originally Posted by digr View Post
It looks like they are calling a wave washer a retaining ring
If so, then they've got it on the wrong side of the bearing on the motor end of the arbor, and it's absent on the blade end of the arbor...anyone know where a wave washer would normally/typically go?

Like I said, their drawing is almost useless...

Thanks for the replies so far.
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Old 10-11-2018, 04:26 PM
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Its behind the bearing where it belongs on the drawing in the link
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Old 10-11-2018, 05:13 PM
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Quote:
Originally Posted by digr View Post
Its behind the bearing where it belongs on the drawing in the link
Unless my eyes are going bad, the drawing doesn't show a wave washer (or "retaining ring") at all on the motor side (which is where I found it between the bearing and the housing) and on the blade end of the arbor, their drawing shows it between the bearing and the housing ... but on my saw there was no wave washer there.

Last edited by Wolfram; 10-11-2018 at 06:03 PM.
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Old 10-11-2018, 05:31 PM
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The snap ring must hold the bearing in on the pulley side of the housing and the nut must be on the out side of the bearing and I would say the wave washer goes on the blade side of the housing then the bearing and everything is brought together by tightening the nut.
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Old 10-11-2018, 06:01 PM
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Thanks for your help, Digr.

I guess the question now is, do I put it back together the way I found it, or the way that Powermatic shows it in their drawing? Or does it not matter?

(My crude drawing above may be misleading regarding the snap ring. The snap ring snaps into a groove in the saw's bearing/shaft housing rather than a groove in the shaft. In other words, the snap ring diameter is slightly larger than the outer race of the bearing.)
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Old 10-11-2018, 06:16 PM
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I would go by the drawing IMO with the wave washer behind the bearing on the blade side.
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Old 10-11-2018, 06:30 PM
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Thank you. Yes, I'm leaning that way, too.
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