Re: [CAD_CAM_EDM_DRO] Re: CNC scripting stuff....

yep, an every company had a different code for the tape, from ebcidec,
excess gray code, baudot and later at 8 bits ascii and frieden, or alphabit
soup of those languages. cul brian f.

----- Original Message -----
From: "lcdpublishing" <lcdpublishing@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Tuesday, May 17, 2005 4:34 PM
Subject: [CAD_CAM_EDM_DRO] Re: CNC scripting stuff....


> I think APT was probably written and run on nearly every type of
> computer system up through to the 80's and perhaps even into the
> 90's. Obviously, pre-80's computers were much different than what we
> see today.
>
> NC machines used to be referred to as tape machines. They used
> paper (or mylar) tape with punched holes in it. If you have ever
> seen teletype machines - same thing.
>
> The machine would read the line of code off of the paper tape,
> execute it, then read the next line, execute it and so on.
> Generally there was some buffering of the data so the machine ran
> pretty smooth, nothing like what we see today though.
>
> Also, those machines (NC) didn't have CRTs like we have today.
> Rather you had a series of 7 segment LEDs that would display one
> word of the program at a time - this feature was actually rare on
> early NC machines. Basic practice was to "Punch out a paper tape"
> and at the same time, using a teletype (or teletype type of machine)
> print out the program listing - without the printout, it was a
> nightmare.
>
> The transitional controls like the FANUC 5 series(General numeric
> 2000, and 3000 series) had memeory and you could load the program
> into memory. But still, we didn't have the CRTs till the FANUC 3
> and 6 series controls came out in the late 70s.
>
> Some of the wording used on CNC machines today still relate to the
> NC days. For example "Punch" is used frequently on newer controls
> to output a CNC program to a computer. If you look through some of
> the newer CNC control manuals, they still show diagrams of what a
> paper tape punch code looks like in EIA.
>
> Chris
>
>
>
>
>
>
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, Alex Holden <alex@l...>
> wrote:
> > On 17 May 2005, at 7:08 pm, lcdpublishing wrote:
> > > They were not CNC machines, they were NC machines, slight
> difference
> > > there. The first NC machine appeared at an IMTS show in Chicago
> > > right around 1955.
> >
> > Presumably they ran APT code through a compiler on a mainframe to
> > generate a set of commands for a NC machine then? How were the
> early
> > NC machines controlled and how did they get the machining
> > instructions from the computer to the machine?
> >
> > --
> > ------------ Alex Holden - http://www.alexholden.net/ ------------
> > If it doesn't work, you're not hitting it with a big enough hammer
>
>
>
>
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