i needed an er16 collet chuck for my stepper motor.purchased two from ebay: "er16 collet chuck motor extension"i've had much luck with chinese tools, but this time... it was a terrible experience.the specs said if i purchased 8mm ID for motor shaft, I would receive 7.98mm shaft so i could induction heat it, then put it on the shafthowever, i recieved 8.1mm oversized hole, so i couldn't use it... too much runout.took over a month for it to arrive, wasn't going to wait again.based on google and forums er collet chucks have 8 degree internal taper anglemy compound was not gonna have the accuracy required,so i used a bevel protractor to get the precision within 0.1 degrees, which for ER collets is enougheven greater precision could be set, if i purchased electronic bevel protractor, but it would cost me over $600 for quality one.i just went with vernier one, which wasn't too bad.below is the link to the making vid of this collet holder, showing almost the complete process required to make thisfeel free to commenthttps://youtu.be/bQxgMjGpD48https://i.redd.it/yxdfaesrmzl21.jpghttps://i.redd.it/fxalnisrmzl21.jpghttps://i.redd.it/vmo0sasrmzl21.jpghttps://i.redd.it/1wvgqhurmzl21.jpg via /r/DIY https://ift.tt/2VYa7qE
