[g-codeguy]

G-codeguy,

Can you post your code so I can have a look at it? Maybe there is something here that I can learn about cycle time reduction.

Thanks,

JK

I am one of the 2 guys in this thread trying to find out how to cut my cycle time on live tooling call. My original program loses almost 5 seconds on the M91. Changing to M98P9000 hesitated for over 6 seconds. I haven't tried the G28H0 yet. Using G28C0 forced me to power down.

Anyhow, for your edification here is what I am running. Part has been rough faced.

N900M191 (3/32 LIVE DRILL)
M91
G50C0
T0909M8
S300M4
G98X.383Z1.C0
Z.06S4885
G1Z.03F25.
Z-.025F2.44
Z-.27F9.77
G0Z.5
C180.
Z.06
G1Z.03F25.
Z-.025F2.44
Z-.27F9.77
G0Z2.06S100
M1

M191 calls program 9001

:9001(TURRET CHANGE SUB)
G0G18G20G40G80G97G99M7
M41
G28W0
M99

G28W0 in 9001 has been deleted for this job to minimize rapid travel. Set-up guy (me ) figured how far to back off each tool so the longest one would have .5 clearance if the turret was indexed completely around.

S300M4 then having S4885 two lines down is a habit carried over from the Daewoo 200MS lathes. Too often the live tool wouldn't engage at high RPM and timed out. This eliminated the problem.

[maximusek]

Maxi,

Have you ever tried G28 H0 instead of G28 C0?

I use G28 to rehome turrets and I know G28 goes with U V W H, doesn't use X Y Z C, to get corret angled position I use G0 C0.0

[maximusek]

Huge Thanks for dcoupar, g-codeguy, Sump Cleaner for suggestions. In my Tw-10 I don't call any sub, everything is in main program, like below:

N4(MILLING)
G0G40G80G18G98
G54 (work offset)
M87(Spindle unlock)
M8
M91(C-axis engage)
G28 H0.0
G50 C0.0
M86(Spindle lock)
M471(Y-axis knock out)
T0404
(.625 DIA.EM)
S1650M89
(machining)

IT WORKS!!! :cheers: 4all - maximusek 10-4

[g-codeguy]

Huge Thanks for dcoupar, g-codeguy, Sump Cleaner for suggestions. In my Tw-10 I don't call any sub, everything is in main program, like below:

N4(MILLING)
G0G40G80G18G98
G54 (work offset)
M87(Spindle unlock)
M8
M91(C-axis engage)
G28 H0.0
G50 C0.0
M86(Spindle lock)
M471(Y-axis knock out)
T0404
(.625 DIA.EM)
S1650M89
(machining)

IT WORKS!!! :cheers: 4all - maximusek 10-4

Glad it works for you. Only dif between your & my program is the G28H0. I added it, but it didn't work for me. Still losing almost 5 sec. I'm not even using the spindle lock function. We don't have Y-axis either.

Guess I am SOL on reducing my cycle time. Too bad as this job has been running for about 3-1/2 years. If I did the math correctly, a 4 second cut in cycle time would amount to making an extra 4685 parts per year at 85% efficiency for the number of hours we work per week.

[maximusek]

Glad it works for you. Only dif between your & my program is the G28H0. I added it, but it didn't work for me. Still losing almost 5 sec. I'm not even using the spindle lock function. We don't have Y-axis either.

Guess I am SOL on reducing my cycle time. Too bad as this job has been running for about 3-1/2 years. If I did the math correctly, a 4 second cut in cycle time would amount to making an extra 4685 parts per year at 85% efficiency for the number of hours we work per week.

- sorry to hear that; In my opinion only someone who has tw-20 is able to help U, that's why I was so crazy in looking for person with the same model of cnc, to many things are optional in those and a lot depend on who was setting up your machine; one more thing forget about Y-axis, it doesn't change anything, I just posted part of the program (I didn't have time, It was busy day and my boss is not very happy seeing me to long in web), before I had:
M91;
G0 C0.0;
and that was causing delay, I changed G0 to G28 H0.0 and added G50 C0.0. That would be all, Good luck g-codeguy...

[Gibbscam]

Hi!!

Maybe some smart head is able to help me - I work at nakamura tw-10 - first operation face off then I have to engage c-axis (left turret) so I use M91. Next operation milling c0, c90,c180, c270, part is quite simple.
the proplem is after turning chuck is in "nobody knows" position, I write M91 and g0 c0 to rehome chuck but it takes time, sometimes after turning I see c axis in 450deg. I cannot wait 3-4 sec. until chuck will be back in 0. Maybe someone knows how M91 works, I need details or some way to fix the problem and make it shorter.
Thank You Guys

Hello. I work with Nakamura Tw-20 and i saw that u have problem with your Tw-10. Can you explain the problem for me at my email [email protected] then i´m sure i can help you
I´m from sweden by the way.