/diy/ - Do It Yourself

>>1287598
>Shouldnt be a problem. There are bearings butted up. Make sure you use 2 washers between the extrusion and the idler so it only contacts the bearing and not the idler body. You can leave out the top washer.

Well if they're touching at the inner race there should be no problem, since it would be the same as trying to compress pure steel with the bolt and t-nut

But if they're two bearings with some space in between, then tightening the bolt will squeeze the balls against the inner race, and they'll either wear much faster or straight up seize

Also

Arduino Mega is supposed to be able to do 10000 steps per second.

If I use a combination of 20 and 60 pulleys I'll have a belted reduction with a 1:3 ratio. I'd need 72000 steps per second to stay at the 300mm/s (at 80 steps/mm). Now, if I use a 16 pulley on the motor and a 20 pulley on the shaft, the ratio will be 1:1.25, right? Which would require 30.000 steps/s for 300mm/s and 10000 steps/s for 100mm/s, which is a pretty good travel speed, especially for a heavy gantry (Fusion 360 estimates it will weight 940g, but it's assuming the motors weight 538g, which is 200g more than what they actually weight according to my scale).