AC Motor upgrade - pulley sizes

[anoldvelo]

Hi To all
just fell on to this site while surfing. A quick intro I am Retired engineer with an ongoing interest in all thing mechanical.

Renovating old machinery. Modifying and improving machinery and making tools and fixtures.

This thread struck a familiar chord with me "HELP: AC Motor upgrade - pulley sizes"

Another solution that is possible with this mill driven with a VFD and 2850 rpm motor would be to remove the gear drive completely and convert to a " Poly Vee" belt drive with the driven pulley directly on to the spindle.

The drive ratio would have to be around 2 to 1 3 to 2 as a ballpark figure. Belt drive is much quieter than gears.

"Poly Vee" pulleys are fairly straight forward to fabricate and fit. You may wish to consider a two or three stepped pulleys.

Posted photo of my X2 mill with a Bigger DC motor and "Poly Vee" drive

Eric