RE: [mfg-smartcam] Npt threads

[Lee Greer]

Colin, this may help you.

 

Second G76 line:

  The X word is the minor dia. on an external thread or the major dia. on an internal thread

  The Z word is the Z axis position at the end of the thread.

  The R word is the radial difference in the minor or major diameters of a tapered thread. Can be omitted on a straight thread.

  The P word is the radial height of the threads expressed without decimal. Example: on a thread with a height of .040, P=400

  The Q word is the radial depth of cut for the first pass. This is also expressed without decimals. Q80=.008 depth of cut)

  The F word is the feed rate which is equal to the lead of the thread. Example a 20 pitch thread has a lead =1/20" = .050 therefore F=.050

 

Lee Greer
CAD\CAM department
Midwest Precision Tool & Die

-----Original Message-----
From: Williams, Colin [mailto:[EMAIL PROTECTED]
Sent: Monday, July 21, 2003 6:52 AM
To: Smartcam Forum (E-mail)
Subject: [mfg-smartcam] Npt threads

There are (2) G76 lines when cutting threads, what is the required fields for the second G76 line. I am cutting 3/4 - 14 npt internal.

 

In particular the "R" which represents the taper value. I'm getting different answers from different sources about this.

 

Thank you.

 

Colin Williams

WABCO Freight Car Products

Phone: 905-561-8700 ext.227

Fax: 905-561-6616

Email: [EMAIL PROTECTED]

 

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