Re: [CAD_CAM_EDM_DRO] getting started with CNCs

Jan,
you 've done a great job!
Alex

----- Original Message -----
From: <JanRwl@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Sunday, May 25, 2003 8:15 PM
Subject: Re: [CAD_CAM_EDM_DRO] getting started with CNCs


> In a message dated 5/25/2003 6:47:22 PM Central Standard Time,
> jwilson002@... writes:
>
> > GWBasic is interpreted. Are you able to handle multiple axis? How do
you
> > intergrate the "Called assembler" stuff? Have you tried QuickBasic? It
is
> > semi-compiled and runs a lot faster than GW. I did a lot of Basic stuff
years
> > ago and "poked" machine codes for fast stuff. I always thought Basic
got a
> > raw deal. You could do anything you could think of with Basic. Would
you
> > elaborate on how you do G code.
> >
> Jim: Carefully pondering if this remain on-topic, I dare take this ¶
line-by
> line: I know. So far, the only "axis-count" I have needed to handle is
X,
> Y, plus Spindle-Motor ON/OFF, and (pneumatically-operated) Tailstock
OUT/IN.
> There are 8 "wires" in the parallel port. I use the first two for "X"
Step and
> Direction, the second pair for "Y" S & D, and the remaining two pairs via
XOR
> gates to operate SSR's controlling the motor and compressed-air valve.
> Simple for simple mind.
>
> For an "X move", say, of ten MM to the EAST, each linear mm. requiring 50
> steps, I'd have a line in BASIC like this:
> 150 FOR X=1 TO 500:CALL X1:NEXT
>
> X1 would be the address of the nine-byte "patch" that causes ONE step
> eastward. (X0 would cause one step westward, etc.)
>
> I never DID QBASIC; I only know it exists. I can handle GWBASIC, but
that's
> about all MY tiny mind can handle, being very, very feeble, with an
attitude
> of such magnitude that... OH, nevermind!
>
> For CURVES, I first calculate a "look-up table" of step-variables for each
> step of X (for example), and then have two "nested" FOR-NEXT loops, the X
makes
> a step, then the Y "looks up" how many steps to take, does that, then X
steps
> again, etc. One must write things to handle (accumulate, add, and use!)
> fractions, as the math is NOT "integer" for circles, etc., of course.
>
> Even a ten-year old laptop with only a 20 mHz. clock will run a FOR-NEXT
loop
> much faster than a stepper-machine can go, so a "delay loop" in the
> machine-code is necessary to set "feed-rates". Then, before each FOR-NEXT
loop, one
> POKES AD,D where AD is "Address of Delay-Loop" and D is the "delay count"
(for a
> Tandy 1500HD, a "3" is a good "rapid traverse", and 8, 15, 30, and 60 are
> useful numbers for woodturning applications on the machine I built using
that
> laptop.)
>
> A recent "Pentium computer" with a 533 mHz clock runs BASIC SO fast that
even
> using a TWO-BYTE-wide "delay number" is counted faster than the laptop can
do
> its values, so SPEED is NO problem in this example!
>
> G-code? First, I'd have to LEARN it, then find or WRITE an interpreter or
> "compiler" (one ol' boy in a local home-machine-shop club did that, it is
MUCH
> more complicated than MY simple method of "learning from scratch,
myself"!).
> No thanks. My application is totally happy with what I do, now.
>
> Jan Rowland
>
>
> [Non-text portions of this message have been removed]
>
>
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