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I want to replace the handwheel with a larger sheave/pulley. Anyone know the bore size, so I can get my ducks in a row before disassembling? Machine is isn't accessible currently...(stored offsite) thanks, all.

I did 3 things to slow ny old clutch motor 1. Installed a 1 1/2” pulley on motor 2. Lengthened the engagement bar by 12” 3. Made a New 6” Hand pulley for the machine from hard maple This increases the gear ratio and maximum speed is now 1/2 of what it was If you have a lathe this is very easy to do I’ve made several for friends and they all love em’

You need 2 of these. https://www.ruland.com/MSC-15-F.html And 1 of these https://www.zoro.com/tb-woods-standard-v-belt-pulley-595-od-ak611/i/G6637970/ Goes on like magic, no modification at all. EWell I did have to move the auto bobbin filler

Does anyone know a source for a small motor pulley that will fit a Rex 550w Servo? I recently installed Rex servos on a Consew 226 and a Consew 206RB-1, and the new motors came with 3" pulleys. As expected, they ran a little faster than I wanted so I went shopping for some smaller motor pulleys. Techsew sent me a 45mm O.D. pulley that they said would fit, but it had a 3/4" shaft. My Rex servos have a 5/8" shaft size. All of the 1-1/2" to 1-3/4" pulleys I can find have 3/4" bores. I did find 1-3/4" x 5/8" standard Chicago Pulleys at the hardware store, but they needed to have the set screw "knuckles" ground off before they would fit against the motor. These actually work pretty well, but it would be nice to have a source for a direct bolt-on part. Also, the Chicago pulley is a tad too wide for a 3/8" V belt. Another idea that came to mind is adding a bushing to make a 3/4" bore pulley fit the 5/8" shaft. Then you would have to cut a slot in the bushing to allow the woodruff key be inserted (or perhaps use a set screw instead). Any easy answers out there? I would love to find a 38mm O.D. pulley that fit a 5/8" shaft. Thanks so much.

Anyone have any experience with the Zero-Max E1 Adjustable Speed Drive or anything like it? It says it uses a series of 4 clutches to reduce the input from anywhere between 0 - 1/4 of its original speed. It's rated for an input of up to 2000 rpm, and it seems to be fairly well made. That's just a general observation though...it seems fairly beefy. I'm not sure what it does to the power/torque of the output though. I don't know if using the clutches as opposed to gears or pulleys means that the speed reduction is achieved by pulling power out of the system as opposed to just simply trading decreased speed for increased torque. I'm not super knowledgeable of how clutches work, but I'm wondering if it basically transfers X % of the power to achieve the decreased speed. If not then it looks really awesome, and like something I'd like to pick up if I can find a good deal on one somewhere. I've found a couple for around $225, the same price I've been finding on the nice reducer pulley setups, but I also found a used one for $150. Who knows how good the clutches are still though. It might be worth the extra $75 to get one that hasn't been used. I'm assuming the clutches on these would eventually wear out just like the clutch on a motor or in a car. I've done just enough transmission work to know I don't like doing it, and I've only worked on the valve bodies...never made it into the clutch packs. Although, that could partly be due to having to do it stuck under a 2-ton vehicle with about 24" of space between the ground and the bottom of the car. Man I wish the concrete in my garage was thick enough to support a 2-post vehicle lift. Enough rambling...any thoughts people?

I'm a newbie to Industrial sewing machines and need to slow the brute down. I have just fitted a Jack JK 563A Motor to my Brother LS2 B837 and even at the slowest speed it is running to quickly. Is it possible to fit a smaller pulley to the motor and what is the size of the shaft? Any advice would be most welcome. Cheers Richard