threading help!!! asap

[joe1970]

I need help with threading issues... I want to make .485-18 un-2a thread with a major tolerance of .485 to .478 and a minor tolerance of .448 to .443.
I have a fanuc O-T control. Could someone out there help with the g-code I should use, I tried g32, g92, and g76 whiuch one is best. and could a sample program be provided?

Any help would be greatly appreciated

[ghyman]

G76 is the easiest to use, and requires the least amount of code.

G76 P010060 Q5
G76 X.4455 Z-1.0 P360 Q5 L.055556

[joe1970]

thanks ghyman I entered in the info given it did indeed make a thread but the but the pitch was so fine it wiped out the major diameter!! I can get the pitch correct with a g32 but the threads come out full of burrs,and I 'd really like to use a canned cycle instead of punching a million numbers in manually. I got 1000 of parts to make and they get plated so they must be flawless. I bought this machine used and haven't had to thread anything until now. I have never run into this problem before I've been on the floor programing and machining for 15 years. I am using a g97,g99,g20 so that is all there. I am begenning to think bad encoder??????

[cogsman1]

T0101
S1250m3
G0x.5815z.1
G4u.5
G92x.4595z-.5f.05555
X.4459
X.4353
X.4263
X.4183
X.4133
X.4133
G0x.5815

[joe1970]

thanks guys I found the problem today a bad wire to my encoder as soon as I fixed the frayed wire it worked fine. Back making parts. I guess I learned a lesson getting a used machine at a bargin basement price will cause alot of head aches until you get all the bugs worked out. I can't afford a repairman at $150.00 an hour so I am on the learning curve. Starting you own shop is such a joy just waiting for the rewards..................

[ghyman]

Wow! scared me there for a minute! I hated thinking that I posted bad code!
Glad you're back up and running!

As for "waiting for the rewards..."

There are rewards?!?!?

gmh