Re: Quick, Cliff another post of JB's for you to shoot down

D Murphy wrote:
"John R. Carroll" <jcarroll@xxxxxxxxxxxxxxxxxxxxx> wrote in
news:RoUtg.121352$H71.22564@xxxxxxxxxxxxxxxxxxxxxxxxxx:

Funny thing? Didn't this all result from a question about
establishing part zero on an old Fanuc control? I don't think Cliff
ever adressed that at all did he?

No he didn't.

Why not? I mean, if I asked you what time it was and your answer was "blue"
you wouldn't have made sense or imparted anything useful.


I know little about turning but how does telling the machine where
the part is have anything at all to do with the math behing the code
to move the tool around. Zero is Zero, or perhaps a signed
incrimental value from machine home. Am I missing something?

Nope. Cliff is.

That's good because I am actually cutting a reasonably pricey part right now
and I am moving my origin around my CAM database instead of either moving
the part or copies of it. I'd hate to think that the machine tool was doing
some unknown transformation of my NC code without my knowing it. The part
seems to be OK. I'll let you guys know if the code starts coming out all
whacky to compensate for the origin shifts and rotations. LOL




He advocates programming from the center of the tool nose radius.
Which is fine and dandy. It works, but there are a lot of good
reasons to program from the imaginary tool nose (as if the tool was
sharp and had no radius).

Motion is still motion if i understand you correctly. That's a pretty good
thing 'cause it's what CNC's do well. Thinking for you isn't and gussing
certainly isn't..

The trouble starts when he claims that that method is wrong and
doesn't work. Which is just silly. As you've pointed out, I could set
zero to the center of the turret and program all my numbers from
there. It doesn't matter. The tool path is the tool path, and the
numbers mean nothing. Nothing that is, until you consider the best
way to make the machine easy to set up and operate. Then programming
from the imaginary tool nose has the advantage hands down.

Especially if you change the TNR.
LOT of bandwidth to make that point fella's. Has it occurred to you that
Cliff is just being obtuse?

BTW, I cut some aluminum with Exxocarb PCD end mills yesterday. How is it
that the Japanese come up with this stuff? Apparently it's all imported and
it is a large cut above anything I've ever seen from anywhere else. The
cutting edge is as smooth as a baby's butt. Even the best cutting edges I
have seen in the past are ragged by comparison. Wish I had more R's on the
spindle. It's a 50Hp geared 50 Taper head. Good for the 1" Hannita WaveCut
though <evil grin>. Big roostertail's there. LOL


--
John R. Carroll
Machining Solution Software, Inc.
Los Angeles San Francisco
www.machiningsolution.com


.

Relevant Pages

  • Re: Quick, Cliff another post of JBs for you to shoot down
    ... I don't think Cliff ever adressed ... Zero is Zero, ... He advocates programming from the center of the tool nose radius. ... The tool path is the tool path, ...
    (alt.machines.cnc)
  • Re: OT The Politcal Brain - Confirmation bias
    ... Cliff wrote: ... Scalar multiplication with the zero vector yields the zero vector: ... magnitude of zero momentum units. ... mass and zero velocity - how much momentum does it possess? ...
    (alt.machines.cnc)
  • Re: Tuple assignment and generators?
    ... Zero, in particular, is ... carry-over from old Fortran/Cobol/Basic programming ideas. ... Python for quite some time. ... that does sometimes trouble beginners to programming. ...
    (comp.lang.python)
  • Re: Customize the effect of enumerate()?
    ... you expecting that will be neither less than zero, greater than zero, ... I don't like the error message. ... tell the caller what went wrong and why it is an invalid index. ... programming that defensively, I'd write: ...
    (comp.lang.python)
  • The Halting Probloem
    ... That has never been zero and one. ... You don't see too many of those freezes any more because good programming ... You need to build computers with yes no maybe so circuitry. ... Cantor only goes so far with a Cantor set. ...
    (sci.physics)