Tangential control

[jal12345]

Hi, I am trying to use Mach 3 demo version for knife tangential control on A axis for my project to cut 2mm thick paper card board. Please help to solve my Tangential setting problem, I set the A axis as the tangential knife for rotate motion.
I simple draw a small triangle shape on MastercamX and export it as DXF format then to test the tangential mode, A axis each turning Mach3 only display about 0.32 units on the A axis Dro and the stepper motor A move also in very small angle . I calibrate the step per unit by using the "Set step per units" mode on setup menu, it suggest 1.25 step per unit. It is fine for manual turn the A axis for 360 degree movement with the 1.25 step per unit setup. Therefore the A axis step per unit setup is ok I think.
Could anyone please to advise me what happen to the Tangential control? When I use the A axis on normal milling, it is working fine for 360 degree motion. Here below is the triangle DXF file open by Mach 3.

(File T.NC )
(Sunday, July 18, 2010)
G90G80G49
G0 Z1.0000
G90.1
S50
G0 Z1.0000

G0 X0.0000 Y0.0000
M3
F80.000G1 Z0.0000
F300.000G1 X10.0000 Y17.3205
G1 X20.0000 Y0.0000
G1 X0.0000 Y0.0000
M5
G0 Z1.0000
G0 X0 Y0
M5M30


Thanks
 
Jack

[Tweakie.CNC]

Hi Jack,

I think you need to tell the A axis which direction to point within your GCode. Would something like this work ?

(File T.NC )
(Sunday, July 18, 2010)
G90G80G49
G0 Z1.0000
G90.1
S50
G0 Z1.0000

G0 X0.0000 Y0.0000
M3
F80.000G1 Z0.0000
G0 A30
F300.000G1 X10.0000 Y17.3205
G0 A150
G1 X20.0000 Y0.0000
G0 A270
G1 X0.0000 Y0.0000
M5
G0 Z1.0000
G0 X0 Y0
M5M30


Tweakie.