Any idea why a straight line at the the top would sag down, to spike up at the end?
FW & GC 1.07.
The gcode has a clear vertical XY coordinate to the left (cut counter-clockwise). .nc and log are in the .zip leftcut.zip (235.2 KB)
Part 2 had 3 different runs on this error for each pass (seen in second ply pic), first a higher error, then a lower error, then the final error between the 2 others. On part 3 the error was constant with all 3 passes. It seems like with the left move the motors are not coordinated.
I’ve seen ‘stall’ massages in the past, but not for a long time. I was thinking that spitting them out would be a chance to narrow this thing in. Not testing any more tonight, but taking the bricks off will give some feedback tomorrow night.
Looks like the left hand chain has jumped the teeth on the sprocket.
Any snagging on the chain links? , are the links free to move?,
try calibrating the chain length but have the both ends free, allowing the chain to move freely,
once chain is finished calibrating the length , attach the chain at the motor mount and sledge,
as if the chain binds on the links it forces a jump
also add some repair washers to the guide pulley to keep the chain running true from the sprockets
I agree, this doesn’t seem like a chain skip, otherwise we would be seeing similar issues across the entire bed. It could be a kinematics problem, but then I wouldn’t expect it to ride up to the proper level at the end of the cut. My first guess would be a motor stall/power issue, especially if it’s at the top of the board, but didn’t see any messages about it. Very strange indeed.
Now that a thought about it more, I think, no.
Part 2 has 3 passes, first is the top cut, second the lowest and third in the middle. Sticking and releasing would be an explanation for that.
Part 3 does all 3 passes at the same cut and error. I would expect a sticking kit to be more random.
Edit: The parts are symmetrical to the middle of the sheet. So I would expect a mirroring rather then a copy.
To help diagnose the problem, run it again without a router bit and the router turned off (that way the bit is not in play). I’d wiggle the sled a bit as it progresses from right to left to see if that changes anything. Just a thought as it would help eliminate linkage kit as the source of the problem… and would be safer as the router is off.