RE: [CAD_CAM_EDM_DRO] Inverse of G-code

Bill -

If you have access to a high tonnage press, you might just use a
slab of urethane as the "positive" die. I've worked on parts that
were formed this way in aluminum. The urethane acts like a fluid
to push the metal into the mold, and then returns to it's original
shape when done.

Regards,

Carlos Guillermo
VERVE Engineering & Design

-----Original Message-----
From: W. P. McGown [mailto:bmcgown@...]
Sent: Thursday, September 18, 2003 10:23 AM
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: [CAD_CAM_EDM_DRO] Inverse of G-code

I have a Gcode file that makes a negative image for a die/mold
that I have
used to cast some ceramic tiles from. Now I would like to make
these same
forms in copper by using a press. No problem on making the
negative die but
the positive one is going to be a bit of trouble if I have to code
the thing
by hand.

Does anyone know of software or a technique that could be used to
"invert"
the G-code?

Many thanks in advance.

Bill

"If nobody makes you do it, it counts as fun"-Hobbes

----- Original Message -----
From: "Jon Elson" <elson@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Thursday, September 18, 2003 10:25 AM
Subject: Re: [CAD_CAM_EDM_DRO] Servo motor question


>
>
> Mina Aboul Saad wrote:
>
> >Hi group,
> >
> >I'm trying to do this for the first time, I'm planning to
change the old
> >Fanuc controller on a German lathe, with a new one.
> >Servo motors are Siemens with the following specs:
> >- Dc Servo, permenant magnet.
> >- 1.03 KW
> >- 2000 RPM
> >- 176 V
> >- 7.1 A
> >- Max. torque 5 Nm
> >With an optical encoder, +5v and 1024 count/turn.
> >
> >I was thinking of using Turbocnc with Gecko drivers.
> >
> >Will this setup work?
> >
> There's one big Uh-Oh! That is the motor's 2000 RPM at 176 V.
> That means you will only get 1000 RPM at 80 V, the limit for the
> Gecko. You can figure out how this will affect your feedrates,
> and then decide whether to go ahead, swap motors, or whatever.
> Rutex has a higher voltage servo driver. See
> http://www.rutex.com/home/index.html for info on their products.
>
> >What is the required DC supply I need to build?
> >
> It should be no more than about 76 V for a Gecko drive.
>
> >Which Geckos to use G320 or G340, and what is the differnce
between them.
> >
> >
> The G340 has a step pulse multiplier. This is useful if the
servo motor
has
> a high resolution encoder, and the computer is very limited in
the step
> pulses per second it can produce. Your motors have 256
cycle/rev encoders

> that produce 1024 quadrature counts, if I read your data right.
At 2000
> RPM, that will produce 2000 * 1024 = 2,048,000 counts/min, or
34,133
> counts/second. If your computer can produce 34000 steps/second,
you
> don't need the G340. And, using the step muliplier reduces the
resolution
> of the servo. But, the voltage problem is the big one.
>
> Jon
>
>
> Addresses:
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OFF Topic POSTS: General Machining
If you wish to post on unlimited OT subjects goto:
aol://5863:126/rec.crafts.metalworking or go thru Google.com to
reach it if you have trouble.
http://www.metalworking.com/news_servers.html

http://groups.yahoo.com/group/jobshophomeshop I consider this to
be a sister site to the CCED group, as many of the same members
are there, for OT subjects, that are not allowed on the CCED list.

NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY POSTING
THEM. DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO
EXCEPTIONS........
bill
List Mom
List Owner



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