FellowLeathersmith Report post Posted April 9, 2021 So I need some suggestions or advice about some belts. I gonna get a servo motor for my Singer 111w153, however I don't have a clue what length or size to get. Much appreciated!! Quote Share this post Link to post Share on other sites
327fed Report post Posted April 9, 2021 Depends on which table or mounting setup. Can measure with a rope to get an estimate, or use one of several online belt length estimators using pulley center to center and pulley dimensions. Keep receipt from auto parts store if you need to swap. Quote Share this post Link to post Share on other sites
Wizcrafts Report post Posted April 9, 2021 Industrial sewing machines use type 3L v-belts and pulleys. If there is a clutch motor under the table and it has a belt, measure the belt and the diameter of the motor pulley. Note that the servo motors sold by our advertising dealers is usually 45 or 50mm (~2 inches). If the original pulley is 4 inches and the new motor has a 2 incher, subtract 2 inches from the belt length. Typically, clutch motors I've had come with a 3.5 or 4 inch pulley and a 42 or 44 inch belt. After converting to a Family Sew servo, with a 2" pulley, I usually end up using a 2 inch shorter belt. This is withing the range of adjustment on the motor. Quote Share this post Link to post Share on other sites
