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Thread: Powermatic Model 91 speed control issue

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  1. 12-06-2019, 8:27 PM #1
    Ken Hartman
    Ken Hartman is offline [OP] Member
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    Jun 2019
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    Powermatic Model 91 speed control issue

    Hey all,

    Newbie here. I have a Powermatic Model 91 lathe. It's in very good condition, but I have a problem with the speed increasing on its own. With a bowl spinning it just gradually keeps rising in RPM. I just recently got it back together, new bearings, belts etc. Running great just wants to run away

    I know a bunch of you guys have experience with the 90 models and this is the same machine, just with the riser blocks.

    Any advise?

    Thanks,

    Ken
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