Suemi Report post Posted November 5, 2011 Hello everyone. I had high hopes of getting a new machine but good ol' uncle sam killed that dream so.... I am purchasing a new servo motor from Bob at Toledo and I was hoping some of you could shed some light on mounting it. I have an old open clutch motor that has a 4 hole pattern and my new servo will have three. Will at least two of the holes line up making the third hole easy to mark or will i have to drill 3 new holes in my table? if I do need to drill 3 new holes, what are my main concerns? how critical is the alignment? Thanks, Rich Quote Share this post Link to post Share on other sites
Wizcrafts Report post Posted November 5, 2011 (edited) You may or may not be able to use the rear two holes with the new motor. If yes, you need to drill one half inch diameter hole dead center in the front, at the forward distance the frame dictates. However, it may not position the pulley in the right plane to line the belt up with the motor pulley. Your goal is to have the motor pulley line up with the machine pulley. If the existing holes are close, but no banana, elongate the rear holes forward, then drill the new front-center hole where it needs be. The motor has rubber mounts that have long slots in them. This allows you to move the motor along its central axis (fwd/bkwd). You will need to remove all of the old wiring and the old switch box and rep[lace it with the new one. If you are careful when removing the big wood staples securing the AC cords, you can pound them back in when you run the new wiring. The foot pedal connects to the motor via a slip joint that you can adjust for best positioning. Ensure that the heel goes almost, but not totally all the way down. Leave a small amount of play to the back of the pedal. The belt is another matter. Two things affect its required size. 1: the size of the pulley, in relation to the original 2: the distance from the underside of the table to the center axis of the motor shaft. If the old pulley is larger and the shaft is farther away then the new motor, you will be needing a belt a few sizes shorter. I would measure the distance from the bottom of the table to the center of the motor shaft, as well as the diameter of the original and give this information to the seller of the motor. They can compute the probable size of the belt, based on the length of the old one. For instance: Say the old belt is 44 inches, the pulley 4 inches and the distance under the table to the center of the shaft is 4 inches. If the new motor has a 2 inch pulley and is only 3 inches from the bottom of the table to the center of the shaft, your new belt would be 3 inches shorter, or 41 inches. The motor is adjustable, but gives best control when it is set close to the center of its vertical travel. Edited November 5, 2011 by Wizcrafts Quote Share this post Link to post Share on other sites
cdthayer Report post Posted November 5, 2011 If the old pulley is larger and the shaft is farther away then the new motor, you will be needing a belt a few sizes shorter. If your old belt is still good, but you need a shorter one, you can cut the V-belt and take a piece out like fitting a round leather belt on the old boot patchers. Cut a chunk out and put the ends back together with a hog ring. My Singer 20U33 V-belt is done that way, and it works just fine. Saves buying a new belt, and having to figure out the length. Just fit the old belt to the new pulley. CD in Oklahoma Quote Share this post Link to post Share on other sites
CowboyBob Report post Posted November 5, 2011 Maybe this will make it easier. Bob Quote Share this post Link to post Share on other sites
Suemi Report post Posted November 12, 2011 Thanks so much you guys. Looking to get the motor soon... All the best, Rich Quote Share this post Link to post Share on other sites
