Re: Re: Old CNC controls

> From: Jon Elson <jmelson@...>
>
> The turning center G-code is G33, for constant lead threading, and it
> doesn't
> require you to back up the spindle to return the tool to the start end
> of the thread
> to take another pass. G34 does variable lead threading, which sounds
> like an
> obscure thing to do.
>

The Threading commands are G32 and G76. The G33 was an obscure command on
the Fanuc 5T to allow for more precise cutting of odd lead(pitch) threads.
The control only supported 4 decimals for pitch & this was an attempt to add
more. In the Fanuc 6T the G33 was eliminated & the G76 was added. The G32
and G33 are single pass threading commands & require that you program the
X(diametral) start point as the tool progresses into the work. The G76
command is a one or two line command that automatically calculates infeed
angles and makes multiple passes. You program only the start point in X and
it calculates the end position based on your depth of cut spec & number of
passes.

Our free threading program is designed to generate a tool path very similar
to the G76, and do it for a machine that may not support the G76 (or even a
manual machine). There is a write up on our web site at
http://www.vectorcam.com

The program also generates the tool path geometry in a fashion that can be
imported into Vector and Vector will then flawlessly generate the G code for
each pass.

We are kicking off a special lease-license that is designed especially for
the home shop/hobbyist user. The program allows you to rent to own Vector
licenses. It is rather unique & we are offering special terms to the
Cad-Cam-EDm-DRO listserve members. Normal term is 7 months, for this group
through the end of the month 5 month terms. Please call us for details as
the info will NOT be placed on our web site till at least tomorrow.