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Thread: 80 lb Power Hammer - video

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  1. #7
    Supporting Member SteelCraft's Avatar
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    SteelCraft's Tools
    how does the variable speed work?
    Just friction between motor pulley and a tire. Harder you press the pedal - less friction more spin. You can change top speed by changing pressure inside tire.
    I recommend to have smooth pulley without grooves which "grind" a tire during operation.

  2. The Following User Says Thank You to SteelCraft For This Useful Post:

    mwmkravchenko (Oct 5, 2021)

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