Goodbye pulleys!

[butterblum]

Thinking about building my own grain mill, and look what I found at work today!
Don't need any pulleys, because it has speed control already built in.

 

[stlbeer]

Sweet!

 

[butterblum]

What speed is best for driving the rollers?
Looks like this gearbox is geared for about 70RPM.

 

[PsychoBiter]

I have read 200-300 RPM is best. 70rpm will work, just take longer. Any faster and they claim it tears the husks and can create astringency.