hansknec

Those patchers can be fixed up quite nice as this guy shows in his video. A work of art! I've ordered one to play with. By the way, there is a Facebook group dedicated to the Chinese shoe patchers with lots of folks contributing if you have any questions about them.

My Rex has not arrived yet, but I am not wasting time waiting.. I designed an even smaller drive gear that fits my servomotor. This is a 16 tooth XL gear, so it will have even more reduction than the 30 tooth that @Reacher10 installed. The hope is with the 16 tooth, and a minimum rpm of 100 on my servo, it will be slow enough and have enough torque to not have to change to a monster wheel or the 3d printed larger XL gear. My servo is the 600 watt one sold as a generic non-brand on ebay for $80 without a synchro. Shaft with key is 15mm (.6") I don't sew often enough to need the synchro. One note if you are printing your own or if you are having one printed you need to specify "wall thickness" in the slicer to be a huge number (10) on this print so it becomes a solid with no infill. Here is the Solidworks part file and the STL file for the smaller pinion drive. I don't know how long a PLA printed gear will last, but I'm willing to try since it only costs pennies to print. 16 tooth.STL 16 tooth.SLDPRT

Another grateful Rex owner. This saved me a bunch of time! I have a 3D printer, but even if someone doesn't own one, there are a ton of online places (Shapeways, Protolabs, Rapidmade, etc) where you can send the stl files for printing and your parts will come in the mail. At some of these online places, you can even have them 3D printed out of metal, but that is unnecessary for this application. If others are reading this, I discovered that you can't download the files unless you join the forum. Thanks @Reacher10