×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

G76 CALCULATION FOR A "G 2 1/2" THREAD?

G76 CALCULATION FOR A "G 2 1/2" THREAD?

G76 CALCULATION FOR A "G 2 1/2" THREAD?

(OP)
Hello,

I am trying to calculate the G76 program co-ordinates for a G2.5 thread?it is 11 TPI,major diameter is 75.184,minor
diameter is 72.226,pitch diameter is 73.705.
Can any one reply with an example of a 2 line G76 program using fanuc?

I have previously programmed unc threads with a 14TPI and feed of 0.714.
any advise would be appreciated.

RE: G76 CALCULATION FOR A "G 2 1/2" THREAD?

How about this I found:-


Example: G76 Threading Cycle in 2 line format for OT and later controls.
2" diameter, 20 Threads per Inch, Mild Steel.
O2006*
N1 G50 S1500*
N2 T0101*
N3 G97 S700 M3*(Speed for threading, always in RPM)
N4 G0 X2.2 Z.2 M8*(Rapid to above part, .2" from face)
N5 G76 P021060 Q20 R5*(The first 2 digits in P represent the amount of finish passes, the next 2 are the pullout distance at the end of the threading motion, expressed in tenths of revolutions, the 60 is the angle of the tool)
N6 G76 X1.94 Z-1.0 P300(total thread depth) Q150(depth of first cut) F.05*
R if needed is the amount of taper over total distance in thread motion.
The P value is figured by taking the F-value times the constant of .6, once figured you also have the X value.( The actual value is P times .62 but its safer to use .6 as a constant and the correct the size by using an offset)
N7 G0 X6.0 Z6.0 M9*
N8 M30*

RE: G76 CALCULATION FOR A "G 2 1/2" THREAD?

(OP)
Ok,thanks for your help.I will give it a try later today.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources