The Sharp SV-3220 mill with a Fanuc Oi-MC controller that I am using has a malfunction that occurs after a rigid tapping cycle. After the tapping cycle finishes, a tool change takes place, and then the following operations that use G01, G02, and G03 ignore their specified feed rates, and run at what appears to be maximum rapid feed rate! Too fast, obviously to cut parts. Has anyone seen something like this occur, or have an idea why it is happening?
- The tapping code is below. This machine require M29 to synchronize the spindle and feed rates.
- There are extra spindle and cooling start/stop commands added before and after tapping just to see that the spindle setting is correct and to ensure cooling while tapping.
- This machine sometimes has homing and coordinate system problems, especially if a program is stopped prematurely. These problems go away either during the following program, or after a following program runs all the way through once.
G00 G17 G20 G40 G49 G55 G80 G90
...header, followed by tool change...
M03 S120
M08
M05
G95 G98
M29 S120
G84 X.1969 Y.5906 Z-0.44 R0.2 F0.0197
...more hole coordinates follow...
G80 G90
M03 S300
M05
M09
- The tapping code is below. This machine require M29 to synchronize the spindle and feed rates.
- There are extra spindle and cooling start/stop commands added before and after tapping just to see that the spindle setting is correct and to ensure cooling while tapping.
- This machine sometimes has homing and coordinate system problems, especially if a program is stopped prematurely. These problems go away either during the following program, or after a following program runs all the way through once.
G00 G17 G20 G40 G49 G55 G80 G90
...header, followed by tool change...
M03 S120
M08
M05
G95 G98
M29 S120
G84 X.1969 Y.5906 Z-0.44 R0.2 F0.0197
...more hole coordinates follow...
G80 G90
M03 S300
M05
M09