Help needed in determining pulley diameter

[lancer]

I've plans to use an Airpax ac motor to turn a platter. Can someone help me to determine pulley diameter size for motor. Details are - motor 250 rpm, platter size is 270mm. Thanks in advance.

 

[Mark Kelly]

What thickness of belt will you use?

 

[lancer]

Mark,

It's 1mm in thickness from a Thorens 850.

 

[dsb]

review Stock Drive Products website, they sell all these components and have guidelines on sizing and selecting drive components.

 

[Mark Kelly]

With a 1 mm belt the equation is

Pulley diameter = ((270 + 1) x 33.33 / 250) -1 = 35.13 mm.