Pulley Size Calculations For Rpms

[Fabrickator]

Here's the formula I use for calculating pulley size and to find feet per minute (FPM). In this instance, I had to use a triple reduction to slow my band saw blade speed down. I've checked it for accuracy with a tachometer.

 

[wrmiller]

Jim... About half way down... Capital P should be small p.
Throws off the whole equation.
Bill

 

[microshop dinker]

This is the formula I use.

This is the formula I use.

View attachment 131588

This is the formula I use.

View attachment 131588

View attachment 131588

Jim D---Do you use a computer or SLIDE RULE??? Sammy

 

[JimDawson]

Jim D---Do you use a computer or SLIDE RULE??? Sammy

I use an abacus