What machines usually come with variable speed motors?

[WinDancer]

There is a scrap metal dealer near here, and I would like to check on a variable-speed motor there. What machines usually come with variable speed motors?

Thanks in advance,

Dave Evans
Tenino, WA

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[Nathan House]

treadmills
come with what you are looking for put they will have to be put in a houseing
because there faces are open
and you do not want the dust to get into the motor,