Im going to pull my hair out. I program and run a Tsugami swiss lathe with a Fanuc 18i-TB control. Normally it gives me no problems. Till today. Maybe it just knew its Friday...
Im just trying to make a simple .030 radius on the face of my part and my machine refuses to do it. Ive tried it with g42 comp, g41, no cutter comp, changed tools, adjusted the bushing tried making the rad with a different tool...nothing uis working...I need some ideas.
There is a .030 rad on the back side of the part and that is working fine. I thought the stock was possibly being stuck on the bushing at the beginning of the program but ive jogged the stock back and forth before multiple cycles with no problem. Also ive felt for a burr with my fingernail. No burr.
If I program a .100 rad it makes one. however when I go down to around a .050 rad it cuts straight down in X ~.015" then cuts half a 90* radius. so there is a step and half a rad. wtf?
With some of the program versions it makes a chamfer but not to the programmed size. There is clearly a G2/G3 where it makes a G1 chamfer
Things/possible problems Ive eliminated:
-Changed my cutoff and turn tool. Both are sharp and are cutting to size
-made sure there is no burr on the bar
-bar feed torque is high enough that the bar is not slipping back
-main collet is tight enough, but not so tight that it wont release the bar
-Ive tried facing the part with my normal front turn then making the rad with another tool. Same problem. (wtf?!?!?!?!) so Its not my turn tool
-Ive tried it in G42/G3 going from X+ to X-.
-Ive tried it in G41/G2 facing, enabling comp and doing the rad from X- to X+
-Ive tried it with no cutter comp, put like 5 g40's infront of the tool and cheating the numbers .005 bigger.
-Ive changed all my Z- moves at the begining of the program to less than 1mm (bushing to tools distance) so that even if there was a burr it would not get hung up on anything before being pushed off with a g41/g2 rad
Sorry if that is hard to read. Its stream of thought and my thought is Im pissed (or stupid and missing something obvious)
Im out of ideas. Help me!
For reference some of the code that failed is:
M13 S4000
T1515 (FRONT TURN .008 NOSE RAD)
G0 G40 X.53 Z.040
G1 G42 X.500 Z.020
G3 X.440 Z0 R.030 F.0007
G1 X-.02 F.002
W-.005
G0 G40 X1.5 T0
another version that failed:
M13 S4000
T1515 (FRONT TURN .008 NOSE RAD)
G0 G40 X.53 Z0
G1X-.02 F.002
G41 X.439
G2X.499 Z.030 R.030 F.0006
X.503 W.020
G0 G40 X1.5 T0
also tried the same code with no cutter comp. same result...