Fusion Thread cycle Post vs Lynx2600y

[watson13]

Hi Guys Just wondering if anyone could help me, so I'm running a new machine Lynx 2600y Doosan but I'm having issue especially on external thread cycle G76. I don't want having a spring pass, currently using a Fusion 360 and "spring pass" is off or not selected, but every time I send the program in the machine it still doing a spring pass. is there anything to be done in the Lynx Parameter to disable extra pass?, Cheers!.

Here is the actual program cutting M16*2pitch:

G21
M110
M24

N21(THREAD1 6)
G0 G30 U0. V0.
G30 W0.
M90
G54
G99 G18 M34
T2121
M8
G97 S1600 M3 P11
G0 Z9.089
X35.822 Y0.
G76 P001000 Q1200 R0
G76 X13.422 Z-36.089 P1200 Q1200 F2.
G80
M5 P11
M9

M25
G0 G30 U0. V0.
G30 W0.
M34
G54 M80

M30
%

 

[Arktouros]

The "R" value of your G76 cycle controls the DOC on the final pass of your threads, even though you've got P001000 to designate that you don't want a spring pass it still looks like it's taking a spring pass due to the zero DOC on the final pass, put a value for final cut DOC in R and it should do what you're asking.

I'll admit I've got no clue how to change what fusion is outputting, it would likely be a behavior in the post.

 

[maguilera]

I agree with Arktouros, it’s doing a spring pass because you set the finish allowance to 0.

Judging by your P&Q’s values, looks like you want to cut the thread in a single pass, which is not advisable.
Also, why not use a compound infeed angle?

This is the G76 code I would use to cut an M16x1.5 external thread:

G76 P010060 Q60 R0.06
G76 X13.546 Z-36.089 P1227 Q388 F2.0

Cheers

 

[DouglasJRizzo]

Hi Guys Just wondering if anyone could help me, so I'm running a new machine Lynx 2600y Doosan but I'm having issue especially on external thread cycle G76. I don't want having a spring pass, currently using a Fusion 360 and "spring pass" is off or not selected, but every time I send the program in the machine it still doing a spring pass. is there anything to be done in the Lynx Parameter to disable extra pass?, Cheers!.

Here is the actual program cutting M16*2pitch:

G21
M110
M24

N21(THREAD1 6)
G0 G30 U0. V0.
G30 W0.
M90
G54
G99 G18 M34
T2121
M8
G97 S1600 M3 P11
G0 Z9.089
X35.822 Y0.
G76 P001000 Q1200 R0
G76 X13.422 Z-36.089 P1200 Q1200 F2.
G80
M5 P11
M9

M25
G0 G30 U0. V0.
G30 W0.
M34
G54 M80

M30
%

On the Doosan -

G76 (1st line) P010060 (one spring pass, straight pull out, 60degree threads), Q0010 (minimum cutting depth .001" - decimal not allowed) R0010 (finishing allowance of .001" decimal not allowed."
G76 (2nd line) X (target point) Z (target point) P (height of thread RADIALLY - no decimal allowed) Q0040 (depth of 1st cut - .004" no decimal allowed) Fxxxx (thread lead or "pitch.")

If you want to eliminate the spring pass, on the first G76, Have the P word look like this - P000060