I had a strange thing happen yesterday that I do not recall ever seeing before. I was doing some straight bit cuts using the 1/8 and 3/16 bits. I had one board that the cut out was offset in the X direction and the cut out did not go all of the way through the board ( I did get a prompt asking how to "cut through, project?". I had already done around 15 of these without and issues. I was using 4" blanks on the ends of the board to save wood and stay under the rollers. During the set up of the next board I kept getting a check tracking roller error. On one try instead of aborting out I continued just to see what would happen. I went into the load bit step and while loading up a bit I notice the board slowly moving to the right with out any sound from the X drive.

I aborted out and started over and the same thing happened with the very slow movement of the board. It drifted almost 1/2" before it stopped. I did a measure board to trouble shoot and I got the same check tracking roller error. I let it do one measurement to see what it showed for the board length and it was about 1 1/2" short. After removing the end blocks I ran the measure board again and got the error and showed 1/2" short. I loaded up another board (18") and it ran without the error but it showed about 1/2" short.

My carving board had a slight twist to it so I am saying that was the cause for the check tracking roller error. My head pressure was in the high 60s to low 70s. I got that back up to 75-80 by doing a clean and relube of the corner posts, lead screws and clutch plate. I did a X calibration as I was almost .75" off on a 34" board. My board thickness checked showed .820" on a .75" board and I got that reset. I also re formatted and refreshed the firmware on the card.

I switched over to using side rails instead of the end blocks as they rails are very flat and straight. This helps to compensate for any small board twist. I've since ran about 20 more carves with very constant results and no errors.

No clues what so ever on why the calibrations were so far off and will probably do a check on them more often and especially if I ever see a unusual error or prompt. The board movement might have been to the board twist and loosing contact with the brass roller and the system trying to make adjustments.