[rwazana]

Hello ,

I need help with writing a program for tranfering a part from main spindle to sub spindle while rotating.

machine is LT10-MY with controller OSP-U100L.

thank you

[Algirdas]

try search. It was discussed in details here.

[OkumaWiz]

I can send some sample code but I'm wondering why you want to rotate during transfer rather than having them stopped? Also are you using a bar feeder?

[fordav11]

You're right about rotation. I never transfer while rotating because the LT doesn't have through spindle chuck air blow so it's highly likely bits of swarf will get caught between the part and jaws if the chuck is spinning. Whereas if it's stopped and the operator has just blown off the part with air gun the part and the right chuck jaws stay clean.
Sync rotation on transfer is mainly to show off to losers who have no idea what is going on (i.e. the boss and his buddies and/or wannabe random white collar morons or suited myopic fatcats who are being toured around the factory)
Sync rotation on tranfser is really only needed if you are clamping the part then parting it off. Even then you can do the transfer and clamp without having the spindle rotating which will definitely minimize bits of swarf getting caught on the right chuck jaws and causing mis-location and runout issues.

FYI a bar feeder isn't needed on an LT. Both chucks can travel in Z so the right chuck can pull the part, clamp then part off.

Anyway here's some code for a LT25-M with added comments. It should work fine on any 90's LT.

(UPPER TURRET CODE)
N110 (TRANSFER PART)
N111 M185 (CANCEL CLAMP INTERLOCK MAIN SPINDLE)
N112 M247 (CANCEL CLAMP INTERLOCK SUB SPINDLE)
N113 (M151) (SPINDLE SYNC ROTATION ON)
N114 (G97 S500 M3)
N115 G00 Z = VNVLZ-VZOFZ + 0.1 W-3.00 (GO TO MAXIMUM STROKE ON MAIN SPINDLE AND W-3.00 ON SUB SPINDLE)
N116 (ADJUST THE W VALUE TO SUIT YOU PART LENGTH AND JAWS)
N117 G94 G01 F50 (SET FEED PER MINUTE)
N118 G29 PW=28 (SET TORQUE LIMIT TO 28%)
N119 G22 W-3.25 D=0.1 L=0.1 F12 PW=28 (SET TORQUE SKIP TO 28%. FEED SUB SPINDLE TO W-3.25 WITH +- 0.1 LIMIT ON END W POSITION. ADJUST W AS REQUIRED)
N120 G28 (CANCEL TORQUE LIMIT)
N121 M248 (CLOSE SUB SPINDLE CHUCK JAWS)
N122 M84 (OPEN MAIN SPINDLE CHUCK JAWS)
N123 G01 W-3.00 F50.0 (BACK OFF A BIT. SAME W VALUE AS ABOVE)
N124 G95 (SET FEED PER REV)
N125 P119
N126 G0 Z50.0 W50.0 (BOTH CHUCKS GO HOME)
N127 M5
N128 (M150) (CANCEL SPINDLE ROTATION SYNC)
N129 M184 (ENABLE CLAMP INTERLOCK MAIN SPINDLE)
N130 M246 (ENABLE CLAMP INTERLOCK SUB SPINDLE)
N131 M1

-----------------------------------

(LOWER TURRET CODE)
N110 (WAIT TRANSFER PART)
N111 P119
N112 Z15.0
N113 M1


If you want to transfer with the chuck rotating remove the brackets around the code on lines N113, N114 and N128
If you want to transfer with sync on but chuck not rotating leave the brackets on line N114

[OkumaWiz]

I think Chuck air blower is standard spec on USA LT machines try M51 or M251 on yours.

Best regards,

[fordav11]

I've got air blow on a flimsy piece of pipe that hangs off the top of the chuck housing using M88/M89/M288/M289 but it's useless IMO. I need through chuck air blow and I don't have it. I know for sure because apart from it not being on the datacard, we've had this piece of crap completely apart many times repairing just about everything on it at one time or another and the back of the chuck draw tube is solid. There's no air blow coming into it. Anyway for me it doesn't matter. The management ran the company into the ground, wasting millions of dollars on 3x Multus and a Macturn and several robots that basically run at about 20% (if they run at all) causing huge losses, plus millions of dollars wasted on numerous other things. So much is the loss that they are closing down the factory at the end of June next year then abandoning everything and cutting all of the machines in half so no one else can get them. So having through chuck air blow doesn't really matter now ;-)

[rwazana]

thnx guys for the reply. i want to cut the part during the transfer because i use bars. i figured out how the code should look like but i have another problem with it . on the LT there are 2 button for choosing working on individual spindle, now when i use G144/G145 to work with the W-axis when both spindles are selected the programs stops at the G145/G145 code. any idea how to fix that?

[rwazana]

i want to use a bar feeder but at the moment the program can not run completely that i will fork on both side with one press of a button.

i would appreciate if you could send me some code examples because i'm still learning the machine and skill , my background is in milling so turning is a bit new to me .
thnx

[Algirdas]

when both spindles are selected the programs stops at the G145/G145 code. any idea how to fix that?

1. wait for an alarm message.
2.check the diagnostics screen.
3. check the feederate condition - is it feed per minute or feed per revolution.

[OkumaWiz]

You have a timing error with your G145 commands. They work like P codes or like your G140 G141 commands and stop your code from progressing. If your P code stops one side from progressing and your G145 stops the other side from progressing you'll sit there forever with no alarm.

Best regards,

[fordav11]

most Okuma twin turret code is like spaghetti. it's a bit too difficult to say exactly what is wrong without seeing your code.
post the entire program here and I should be able to fix it. I work an LT every day and am very familiar with how they work (or don't work as is the case with my piece of crap).