THREADING WITH G76 ALTERNATE FLANK INFEED

[girishnadkarni]

Can anybody plz explain how to machine threading on turning center
with fanuc OI-TC control using G76 alternate flank infeed
Note - alternate flank infeed is important
thread specification 3-1/8" -8un CLASS 2A thread
major dia-79.11 mm
minor Dia-75.52
plz ans in detail

[scappini]

no cam software?

[jlavery]

Here is a program for threading 3-1/8- 8UN

To use staggered cutting the program must be in Fanuc FS15 tape format.
G0 X80.0 Z5.0
G76 X75.52 Z *** K1800 D400 F3.175 A60 P2

X= Core diameter
Z= Thread length
K= Height of Thread
D= Depth of first cut
F= Pitch of thread
A= Angle of thread
P= Staggered cutting

[h064801]

The attached pdf should help you.

[E.T.]

X= Core diameter
Z= Thread length
K= Height of Thread (radius)
D= Depth of first cut (on the Radius)
F= Pitch of thread (F or E)
A= Angle of thread (Of importance if you are using P1 or P2! P0 is plunge cutting
P= Staggered cutting
I= Taper on Thd (on Radius. E.g.: I0.001 gives you a +0.002" increasing diameter)

[girishnadkarni]

thank u every bdy, will try it out

[girishnadkarni]

hello
thanku for assistin me in threading with g76
but what is the number of passes it takes for threading
or if its standard
i.e (72/threads +4) = passes
threads = thrd/inch
can i alter the nos of passes

[dcoupar]

Number of passes is determined by the depth of first cut (D). Increasing D usually results in fewer passes.

[jcdammeyer]

The attached pdf should help you.

Can you tell me who owns the copy right to that document? I'd like to link to it for the Electronic Lead Screw.

Thanks
John Dammeyer

[h064801]

I dont remember where I got the document. I have had it for a couple of years.

[jcdammeyer]

I dont remember where I got the document. I have had it for a couple of years.

Thanks. I'll link to it with a disclaimer then so that if the orginal author ever sees it there will be an outstanding offer to add the credit.

Good document.

John
http://www.autoartisans.com/ELS

[h064801]

That will work