stalling problem
Hi, A while back I built a 4x4' rack drive router with 4 425oz-in xylotex motors. I had troubles with the rack staying against the pinion which led to gross inaccuracies. After failing to remedy this with several different adjustable and non-adjustable spring loaded contraptions to press the pinion against the rack, I gave up, tore off the racks, and replaced them with 1/2"-10 ACME screws, same motors, 2 screws on the y axis. Since the switch, every cut is very accurate.
I'm pretty sure (measured to .002 with my digital caliper) I have the screws aligned. My problem is I do not think the lead nuts are squared up properly. When first installed, I stalled the motors out at 15ipm, after adjusting on them for a little bit, I could attain 30ipm before stalling.
So my question - how do you guys square up your lead nuts properly? I've read with this set up some people are getting 50-70ipm! I tell you 30ipm burns up bits very quickly!
I also need to stiffen up my z axis, so it stops flexing if the cut is too deep, but one problem at a time...
http://www.homebrewedtechjunkie.com - My techie projects, including a cnc build.