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-----Original Message-----
From: Brian Fairey <bfairey@...>
To: CAD_CAM_EDM_DRO@... <CAD_CAM_EDM_DRO@...>
Date: Thursday, May 20, 1999 8:58 AM
Subject: Re: [CAD_CAM_EDM_DRO] Still a little unclear

From: Brian Fairey <bfairey@...>

Naughty naughty Dan, one of the problems with this list is that there are

those that want to do CNC for $7.95( dont we all) those

that have problems working a computor never mind building CNC and those

that are using a self built system every day to make

parts(you and I) and a whole lot in between.
Brian.

Dan Mauch wrote:

From: "Dan Mauch" <dmauch@...>

There are various menas to get the G code program to the machine.
1. Carry a diskette from the computer that generated the G code to the
computer that has the G code interpreter tha runs the machine.
2. Send the G code tool path by modem to the computer that will run the
machine.
3. Send the program via a network to the machine.
Dan
-----Original Message-----
From: Jonty50@... <Jonty50@...>
To: CAD_CAM_EDM_DRO@... <CAD_CAM_EDM_DRO@...>
Date: Wednesday, May 19, 1999 10:51 PM
Subject: Re: [CAD_CAM_EDM_DRO] Still a little unclear

From: Jonty50@...

In a message dated 5/20/99 1:24:23 AM Eastern Daylight Time,

pencad@...

writes:

<<
Am I right in assuming that there are many various ways in getting a

DXF

file or whatever format to the machine for processing. From what I
believe thus far, I can produce with my CAD a file that can be
translated into code by a CAM program and then at this point I become
unsure of the "various" means of getting that information to the
machine. I have downloaded many demo programs from the CAM side of the
house, and these have helped me to get somewhat comfortable with the g
and m codings.
>>

Probably the simplest and cheapest way to get into the CNC/CAM game is

to

use

a program such as "stepster" (freeware) or DeskNC (cheap shareware).

Both

these programs (and others I haven't tried or mentioned) convert the G

code

file into a series of pulses that are sent to the parallel port. These

pulses

at the port are very weak, the purpose of the driver board which

connects

to

the parallel port is essentially to amplify the pulses to a voltage and
amperage adequate to run a stepper motor.

You basically tell DeskNC how many pulses in which direction it takes to

move

your machine one inch in a given axis. In my particular case it takes

4000

pulses/inch in the X and Y axes and 8000 steps per inch in the Z axis,

keep

in mind that these numbers are determined by the characteristics of the
motors themselves (how many pulses per revolution) and by the

characteristics

of the machine to which the motors are connected (how many revolutions

of

the

motor shaft to move one inch). DeskNC then reads the G code file and

converts

a command for a given move (eg: 1 inch left on the X axis) into the

correct

number of pulses and the direction signal to "make it so"..

The flow of the overall system is rather like this:

(in your computer) CAD program outputs DXF file >>> DXF file converted

to

GCode >>> GCode to DeskNC >>> DeskNC to parallel port pins >>> (now we

move

out of the computer) >>> parallel port pins to driver board/amplifier

driver board/amp to stepper motors >>> stepper motors to translation
mechanism in your machine (can be ball screws, belts, gears, steel cable
wrapped around a drum or what have you.

Hope this helps... I've spent a considerable amount of time puzzling all

this

out pretty much by myself and wish that I had a forum such as this

during

the

process.

The problem with much of the hobbyist/inexpensive hardware/software is

that

it is often rather sparsely and cryptically documented, assuming a great

deal

of knowledge of the subject that the beginner (those most likely to be

using

such wares) usually lacks.

Jon Croad in Atlanta, GA

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