pulley / mixer calculation

[UBbaja]

I am missing somthing simple here I think.

here is my pulley belt set up- 5" pulley on motor @1725 RPM drives a pulley of "x" diameter. Further on teh same sfat is another disc of 5.5". I know I want teh other disc rotating at 1916 RPM. I need to figure out my unknown driven pulley diameter that woudl allow me to get teh correct spped for teh 5.5" disc. ANy help?

As I said i think i am missing something here, I kno wteh eq. D1V1=D2V2- this could be used if i knew the Diameter of the driven pulley to calc the RPM of it. After trying to go backwards from the 5.5" disc i need at 1916 RPM- before trying any calcs It looked as if i woudl be able to use two equations as i have 2 unknowns- teh driven pulley diameter and its RPM.

Ideas?

 

[UBbaja]

sorry for my mad typing. The 3rd disc is on teh same shaft as teh driven pulley, just to clear that up.

 

[hydtools]

You have one unknown, the diameter of the driven pulley. The 5.5" disc turns at the same speed as the unknown driven pulley.

Driven pulley dia = 5 * 1725/1916 = 4.5

Ted

 

[UBbaja]

Haha, duh! I need to think back to the basics- thanks a lot Ted.