PROBLEM:
Shark will not cut to project depth (1/2"; 8 passes; 0.25" end mill). When setting Z0, either with touch plate or manually, and running program code, return to 0,0,0 results in Z0 about 0.3" above board (though reading shows 0,0,0). X0 and Y0 are faithful. This is a recent development. Previous G-Code worked just fine. This is merely a second identical piece using the same code.
ATTEMPTED SOLUTIONS:
-verified that router was tighly fastened to gantry
-verified that bit was tightly fastened to router; new bit (very sharp)
-attempted to set Z0 BELOW project board to "trick" it into cutting greater depth. FAILED
-set project size to 0.7" to force to cut through 1/2" project board into sacrificial board. FAILED
Could use some wisdom here...
JC
Z-axis Drift; Failure to cut to depth
Moderators: ddw, al wolford, sbk, Bob, Kayvon
Re: Z-axis Drift; Failure to cut to depth
Can you post the file so we can take a look at it please. Without seeing it, have no idea whats wrong, might be in the file setup. You can send me the file at tonydude919atyahoo.com
Tony
Tony
Buffalo,NY
"What will matter is not what you bought but what you built; not what you got, but what you gave”
Aspire 11.015, photo vcarve, cnc mako shark extended bed with the new upgraded HD 5 gantry with Led pendent.
"What will matter is not what you bought but what you built; not what you got, but what you gave”
Aspire 11.015, photo vcarve, cnc mako shark extended bed with the new upgraded HD 5 gantry with Led pendent.
Re: Z-axis Drift; Failure to cut to depth
Hello JC
Can you jog the z axis down, so that the bit is lower than the desired cut depth?
The symptoms you describe can happen if you hit the end of travel on the z axis in the down direction.
The stepper motor will try to move further and miss steps. The controller does not know this and and the bit position when returned to zero is now above the original level due to the missed steps.
This can also happen if the bit slips up in the collar, or if there is binding in the z axis. Usually Z axis "drift" problems are downward, resulting in too deep of a cut and chewed up aluminum tops.
If you want to verify that you may be running close to the end of the z axis, just run the job with no work piece on the machine and check if you bottom out the z at any point. One bottoming touch and the zero position is lost.
Bob
Can you jog the z axis down, so that the bit is lower than the desired cut depth?
The symptoms you describe can happen if you hit the end of travel on the z axis in the down direction.
The stepper motor will try to move further and miss steps. The controller does not know this and and the bit position when returned to zero is now above the original level due to the missed steps.
This can also happen if the bit slips up in the collar, or if there is binding in the z axis. Usually Z axis "drift" problems are downward, resulting in too deep of a cut and chewed up aluminum tops.
If you want to verify that you may be running close to the end of the z axis, just run the job with no work piece on the machine and check if you bottom out the z at any point. One bottoming touch and the zero position is lost.
Bob