problems with the Y axis

[toddschroeder76]

i'm in the process of doing some signs. the shortest carving was 40 inches long and the longest is 67 inches long. i got the first two signs done wihtout a problem, but during the craving of the third and final sign which was the longest of the 3 the carving jumped about a 1/2 inch to 3/4 half way through the sign. i thought it might be a belt issue but the belt and teeth on the gears were ok. i then checked the y truck motor and gears all of which were in good working order. i took off the back cover of the y truck motor to expose the sensor and there was some dust in there. so i cleaned it out put it all back together thinking i had hopefully solve my problem. started the carving again and about 45 min to an hour in it did it again but this time after it jumped it made what looks like about 2 passes and stoped with error 238 y axis stall coming up. just for the heck of it i cleaned the machine and ran it again on the same board. it stopped in the same spot. i am out of ideas of what this could be but it is starting to get expensive since the wood i'm using is cedar.

thanks for any help
todd

[aokweld101]

the first thing that I would do is turn off the machine and make sure that it moves freely without no hang ups.

[toddschroeder76]

Everything moves freely and I just put a new bit in

[henry1]

go here and see the tip
http://www.carvewright.com/support-p...om_axis_stalls

[bergerud]

If the "same spot" is a place where the carving went deeper, the problem could be as simple as a dull bit.

[bergerud]

Could you post a picture of the carving where it "jumped".

[DickB]

I had a similar problem a while back. I thought the truck was moving freely when I pushed it by hand, but it turned out I had a stuck bearing. I believe that I actually had to loosen the two movable bearings away from the rails so that they could be spun freely. Two bearings were fine, one had some resistance, and one was nearly stuck. I ordered replacements, but tried cleaning and lubing them in the meantime, which worked. I never did install the replacements.

[toddschroeder76]

If you look close you will see that it jumps in the middle of the I and then again at the beginning of the N and at the end.

[bergerud]

If you have sandpaper belts, check for belt roll under.
If you have rubber belts, check that the belt is not interfering with the brass roller.
Do you see the brass roller tracks on the board?
Check the head pressure.
Check out feed rollers too high.

[Rob Mulgrew]

Sandpaper belts are fine...Yes, you can see the tracks on the board and there are no areas that the board left contact with the roller...Head pressure is good...feed rollers don't actually touch the board, they sit a bit low but the board is only 24" long and not heavy.
I'm not sure where to go from here. I can carve fine but cannot cut anything out?

If you have sandpaper belts, check for belt roll under.
If you have rubber belts, check that the belt is not interfering with the brass roller.
Do you see the brass roller tracks on the board?
Check the head pressure.
Check out feed rollers too high.