Pulley/rpm

Mutt

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Motor 3450 rpm 3" pulley
driven tool 4" pulley
so that would be about 2587 rpm for the driven tool? Is this right?
 
Motor 3450 rpm 3" pulley
driven tool 4" pulley
so that would be about 2587 rpm for the driven tool? Is this right?
Yep.
 
Correct
3 X PI = 9.4
4 X Pi = 12.5

.94 / 12.5 = .752 a ratio of 1:.752
3450 X ,752 = 2594
 
It's simpler than that. The pi's cancel, so it's just 3/4, or .75.
 
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