Handwheels again?!? was Re: true closed loop vs. hobby closed loop

Ray,

I too have used CNC machines in the "real-world"...

Are you talking about an MPG? Or other electronic handwheel? Because
that's NOT what's being discussed here...

We're talking about why you need to manually turn a handwheel that
isn't tied to the control in any way...

I'd bet I can find an edge with my jog buttons faster and more
accurately than you can turn a mechanical handwheel to do the same
job. Especially the more accurately part. Because I can "click" off
the part feature .0001 (or whatever the machine resolution will
allow) at a time. reliably. repeatably. If I'm using an edge finder,
there's gonna be no mistake as to when it "kicks" or "lights"...

So if we're looking for the EXACT "edge" mine's gonna be better'n
yers...

If the feature is a hole, I'm gonna beat ya even more because I can
call a "hole center finding" macro or code with MDI. Meanwhile you'll
be turning those handwheels manually and touching off at least 4-6
times. So I'll again be faster, and again more accurate.

Ballendo

P.S. The thing I find really interesting about this whole issue is
that I've found that the use of jog and MDI makes the SIMPLEST things
faster and better. ONE hole. ONE cut. One setup.

It was one of the greatest discovery's for me with CNC; having been
using manual machines before. I can setup and cut these simple things
MUCH faster WITH cnc than before. All I had to do is think CNC
instead of "manual". Which is inhibited by having handwheels, because
we humans tend to go with the familiar over the unknown... Even when
we're dead wrong...

As the civil war general in the tent told his secretary, "Tell that
salesman to get out of here! We're trying to win a battle!"

Outside the tent stood the salesman. Next to his product. A gatling
gun.



--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Raymond Heckert" <jnr@a...>
wrote:

> As one who has operated a CNC machine in the 'real world', I can

attest to

> the need for handwheels. By far, the majority of jobs I've run

require the

> G92-ing of the workpiece from some feature on the part. Also,

reworking or

> re-installing the part for subsequent operations is also sometimes
> required. It's so handy to use the handwheel to get to that

reference

> point.
>
> RayHex
>
> ----------
> > From: ballendo <ballendo@y...>
> >
> > Kevin,
> >
> > You have CNC. Why on earth would you need handles?!?
> >
> <snip>