Powermatic 141 vibration...please help

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Forum topic by mlipps posted 10-07-2016 11:40 PM 689 views 0 times favorited 2 replies Add to Favorites Watch
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122 posts in 1312 days

10-07-2016 11:40 PM

Topic tags/keywords: powermatic 141 powermatic 141 band saw bandsaw runout vibration restoration fix wobble motor pulley belt

Hi LJers,

Hope all of you are safe those who are braving the storm.

I recently purchased a Powermatic 141 (1974 – Green model) from CL. Everything seems to be in good shape despite the cosmetic chips and mars of the paint job. When I bought it, it cut straight and accurately but there was excessive vibration. I figured I could tease out the issue but it seems to be more than I bargained for so I’m turning to you folks.

What I’ve done so far with Powermatic Customer Support (they’re great btw).

1: Removed the bandsaw blade and ran the machine – Still vibrating
2: Removed the belt – Still vibrating, but less so
3: Checked belt for wear – seems fine, but ordered new ones
4: Checked tires for wear – cracked on the sides but okay on the crown. Replacing these.
5: Took a dial indicator to the upper pulley and lower pulley. – There seems to be some vertical wobble around the perimeter of the wheel but with the dial indicator set to the pulley’s channel/groove, there was less than 0.001. Still the Powermatic support said to replace it (cheap enough).
6: Checked the motor spindle for runout. Close to the housing there isn’t any, further away there seems to be 0.004”. I could potentially run the new pulley in the area that doesn’t have run out.

Left to do: hard mount the motor to my bench and see if it vibrates.

Is there anything else I should be doing? Any other major culprits of vibrating?

Thanks again,

2 replies so far

View bigblockyeti's profile


5285 posts in 1918 days

#1 posted 10-08-2016 12:34 PM

If you ran the motor with no belt and were still able to identify some vibration, that’s were you need to concentrate your efforts. I would first clean the motor thoroughly as any accumulated dust could be causing some of your problems. After getting the motor sorted, I would then check to see if the wheels are balanced. The belt which you’ve already replaced should be the only other source of potentially significant vibration. Let us know how it works out.

-- "Lack of effort will result in failure with amazing predictability" - Me

View mlipps's profile


122 posts in 1312 days

#2 posted 10-08-2016 12:42 PM

Appreciate the post. Will do and thanks.

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