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Thank you for the info; As you say, our setups are very different, mine uses two MB330 belts both from motor to countershaft, and from countershaft to spindle.

Flip side of insomnia, one starts designing something, then spends the days making the design !

After forty years of swearing at the Cowells (Perris ?) method of belt tightening, I finally solved the problem. No longer will I have to loosen a clamp bar, push like one demented on the countershaft bracket, and tighten the clamp bar, belts now loosen and tighten at the flick of the finger...

Gat an answer on the Model Engineer forum, if it can be of use to anyone here. The driven pulleys on the countershaft: 73.99mm, 57.62mm. The motor pulleys: 26.59mm, 45.09mm. These diameter measurements are across the 'top' of the Vee (max. dia.) and are by digital calliper. Access to the motor...

Sad to say, your replies do not address the original question, and are to me completely useless...

Thank you but this does not help me. I do no want to change the the AC motor for a DC one, but upgrade my setup to the current Cowells configuration.

My Cowells lathe is almost forty years old, from the days when it was not a 90E or 90ME, but a "10-200A Lathe with Auto-traverse". I read in the recent 90ME data sheet from the Cowells site that the lathe now comes fitted with double pulleys on both motor and countershaft, giving the lathe two...