Centroid Community CNC Support Forum

ok i think the issue was just crappy bearings from dave. just got new ones in from bearings direct and been testing. have y axis at a steady .00114. ty for all the help and info. now need to order some new ones for x as well. sucks spending so much on a kit just to have to replace bad parts. think ...

ty for the info, in regards to the travel speed it looks like im just stuck with the slower speeds as i dont want it to ping the probe to hard would just like it to travel to its next point quicker.

for the bearings yes they are angular, think 7202b 2rs if i remember correctly. i made sure they ...

well im leading towards possible bad bearings, i tried multiple times yesterday, first was with vid and have it free spinning when loading, the problem is if i put any load on the bearings it doesnt free spin. run out was still high. i put maybe 1/8 turn of preload and removes about .002 of the .007 ...

There are three points that directly affect backlash with your current setup:

1. The connection point between the ball nut and the saddle. If your mill is a PM833, this is done with an M8 screw. Be sure it is tight and use lock tight.

2. The bolts that fasten the bearing block to the mill. Also ...

If you can see either end of the Y axis ballscrew I'd put a dial indicator against it and jog the machine backwards and forwards and see if there is any play there. Also check the bolts for the ballscrew unit attached to the underside of the machine bed are actually tight, I've seen them loose ...

Here some pics

anyone know what i could look for with the y axis, there is literally nothing that an be adjusted. it has 2 bearing that sit on either side of the motor mount, then a screw on coupler with a set screw then motor mounts on. in the middle is just a block with 2 screws holding the y axis. other than ...

Axis Label Motor Encoder Lash Comp. Limit Home Dir Screw
revs/in counts/rev. (inches) - + - + Rev Comp
1 X 5.0804411060000003 4000 0.0029 0 0 0 1 Y N
2 Y 5.0912161339999997 4000 0.0068 0 0 0 1 Y N
3 Z 5.0834597180000003 4000 0.0014 0 0 0 1 Y N

Backlash on y is way too much to make round holes ...

hi this is one from a fresh boot not sure if it matters.

hello ive been doing alot of fine tuning lately and have gotten my x,y and backlash in my opinion completely eliminated with tolerances .0005 and backlash so small i cant measure it. after moving on to making perfect circles though i noticed there is a light difference in the 10:30 and 4:30 where ...