Re: Still a little unclear

Yesterday I machine a radial slot in a part that I was making for my mill
drill. No having a rotary table I find it wonderful to be able to have
various cnc machines to make parts that would other wise be difficult or
impossible without more tools.
I now have a homemade servo on both my mill and my mill/drill.
Dan
-----Original Message-----
From: Brian Fairey <bfairey@...>
To: CAD_CAM_EDM_DRO@onelist.com <CAD_CAM_EDM_DRO@onelist.com>
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@onelist.com <CAD_CAM_EDM_DRO@onelist.com>
>> 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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