I'm confused onthe g76 commandas well can someone explain each of the varibles on each line ... for say a 1/4-20 thread starting at z-.300 and ending at -.785
thanks
ron







From: Petre Kounov <[EMAIL PROTECTED]>
To: "'Williams, Colin'" <[EMAIL PROTECTED]>, "Smartcam Forum (E-mail)" <[EMAIL PROTECTED]>
Subject: RE: [mfg-smartcam] N.P.T.
Date: Mon, 24 Mar 2003 07:45:29 -0500


R will increase the Pitch diameter at Z-0.68 with 0.0718 ( 2*R ).
Also P in the second line should not be 0 ( P is the height of the thread).

Hope this help,

Peter

-----Original Message-----
From: Williams, Colin [mailto:[EMAIL PROTECTED]
Sent: Monday, March 24, 2003 6:47 AM
To: Smartcam Forum (E-mail)
Subject: [mfg-smartcam] N.P.T.


I am trying to cut: 1 1/4 - 11.5 npt on a Dainichi 18-t Fanuc control. Does anybody know what the G76 line should look like. What should the 'R' value in the second G76 line be? The problem I am having is that the taper on thread seems to be out, seems to cut bigger at the bottom end.

example:

G76 P10060 Q0020 R.0020
G76 X1.61 Z-0.68 P0000 R.0359 Q0110 F0.0869

Any help would be appreciated.
Thanks

Colin Williams
WABCO Freight Car Products
Phone: 905-561-8700 ext.227
Fax: 905-561-6616
Email: [EMAIL PROTECTED]


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