Moderator Wizcrafts Posted March 28, 2023 Moderator Report Posted March 28, 2023 21 hours ago, Xaff2442 said: What is the benefit of this design of speed reducer as opposed to just reducing the size of the pulley on the drive motor? If you are able to achieve the slow speed control and punching power you need at that speed, you don't need a reducer. However, if your motor power drops too far down to punch the needle and thread trough the work at that slow speed, a reducer will allow the motor to spin faster while the machine turns at the desired slower speed. For instance, I have multiple sewing machines that have analog servo motors like this one. This type of motor has a simple knob on a pot or rotary switch that varies the top speed. At the lowest top speed settings the torque drops down to the point the motor won't turn the machine over without help. I have to increase the speed setting a little to get the machine to turn over. This also translates to a higher slowest speed. If I really need to sew slower, and steadily, at a rate below what the direct motor give me, I can add a speed reducer. Some are 2:1, others are 3:1. This hasn't addressed to part of the O.P's question about the difference between having a smaller motor pulley versus a speed reducer. I would try changing to a smaller motor pulley first. Adding a reducer is a hassle no matter what type it is. Plus, it requires an additional belt. Note, that changing the size of the existing motor pulley may also require purchasing a different length v-belt. Quote Posted IMHO, by Wiz My current crop of sewing machines: Cowboy CB4500, Singer 107w3, Singer 139w109, Singer 168G101, Singer 29k71, Singer 31-15, Singer 111w103, Singer 211G156, Adler 30-7 on power stand, Techsew 2700, Fortuna power skiver and a Pfaff 4 thread 2 needle serger.
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