Re: [CAD_CAM_EDM_DRO] Bridgeport CNC Mill???

Jon .. a Q at top ..

Does EMC23 support multiple spindles in lathe, mill or both ?
With step/dir control, or +/-10V or something ?
---

>
> "hanermo" - CNC 6-axis Designs wrote:
> >
> > Corrected ... servo update rate at 1 kHz is enough BUT,
> > EMC sw servo control is not (as the max rate is far too low in
> software).
>

> WHAT "max rate" exactly, is "far too low" on EMC?
>

The possible max servo speed that emc2 supports directly in software,
wiht the PP, qwithout additional hw, just as I said, you said, emc2
manual said.
And that has been used endless times as a justification for emc2 ... "it
supports servo !"

> I could send you the program if you'd like to compare.
>

You are an authoritative source.
I will try to run it on a lathe or grinder, later this fall, with interest.

>
> >>
> > Yes they will.
> > Neither is a recognised industrial supplier, with compatible
> funcionally
> > identical hw available from several sources.
> >
> Fine, if you MUST have Fanuc, Kollmorgen or Allen-Bradley, pay their
> prices and don't
> complain to us when a 3-axis setup runs to $50,000.
>

I know ;( ..
I would never complain to you when someone else tries to overcharge me ;)
Smile.

On teh other hand, very good large step/dir servos are now available
from many sources, and they are getting more common, cheaper and better
all the time.
Also with support for brushless ... which is great news.
For all of us, regardless of the sw platform.
Step/dir is a simple std that provides for easy vendor independence, in
my experienec, and in my opinion.
It aölso allows easy cheap mix and match of different levels of
power/accuracy and speed, as required.

> And, if you try to
> swap out a Fanuc
> servo amp with a Kollmorgen, I suspect you will find out the plugs don't
> just plug
> right in. There WILL be some reconfiguring and adapting required.
>

Absolutely.
The industrial guys are well-known to play games with these ... this is
ending as prices are finally coming down.. due to availability of
similar specv hw from competitive sources.

> > Advanced is anything on a lathe with multiple axes;
> > more than 4 axis mill,
> > with servo-indexed spindles,
> > live tooling,
> > multiple spindles,
> > multiple turrets
> > and so on
>

> You really need to check out what Stuart Stevenson has done with his
> Cincinnatti 5-axis
> machine. He has some interesting Youtube videos of it doing a ball test
> showing the
> accuracy of 5-axis coordinated motion. I really don't think you can do
> this on Mach.
>

Of course you can do this on mach3.
Rab of Rainnea did this many years ago, with routers, about the same
time the Cinci 5-axis started to work ... maybe 3-4 years ago.
Mach3 supports 6 axis, plus only one spindle.
This is the biggest single drawback, and we are hopefully expecting a
solution maybe this fall with mach4.
Mach3 should support multiple spindles, at some point, relatively easily.

In the mean time, hw multi-spindle native support is going to come from
other hw vendors, with their proprietary single-source solutions.
Not ideal, I know.

The whole point was, again, that mach3 was/is vastly easier to configure
for many axis, with some graphical controls /displays.

> And, I know you can't do the kinematics corrections in Mach that he has
> done to
> correct for all the inaccuracies in the construction and installation of
> the machine.
>

Absolutely true.
No kinematics in mach3.

OTOH, kinematics correction is not really on my list of things to have ..
But things like absolute e-stop with maintained reference woud be nice.




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