Re: [CAD_CAM_EDM_DRO] USB options ...

My question is really;
What equipment to I need, ie which boards, and how many,
to do an industrial-quality setup.

step/dir, 6 axis and 2 spindles.
24V IO, 40 of (approx).

--

Good lathes, today, have a c axis (servo indexed spindle), and y axis
for milling the workpiece for holes and keyways, and a subspindle.
The y axis is live tooling.

The subspindle is opposite the main spindle (and of lesser power).
This allows machining the back of the part, without touching it.

For many manufacturers, live tooling, ie y-axis, is today more common
than without it.
Subspindles are less common, and more expensive.

An example of such a lathe is a Haas DS30Y.
http://www.haas.co.uk/ds30y.html
https://www.youtube.com/watch?v=Q9595ldX-2k

They can syncronise the 2 spindles, while running, so that the
subspindle picks up the part while running without stopping.

Pseudocode logic would be something like
M3 S1000 (run at 1000 rpm)
.. work..
M6 S1000 (turn on second subspindle) Sync_command
lock second spindle
IF Spindle_2_lock_on ..
open spindle_1

Ideally, this would be doable with std hw, I mean without modifying
anything.
IF it is NOT possible to do spindle handoff while running, it is
(barely) acceptable to stop the spindles.

Surprisingly, spindle acceleration is a lot of time, wear and tear, and
a lot of power used, on bigger lathes.
This is not really the case for me, for what I want to do, but the
ability to do running transfer puts you in with the big boys.
So, it is desirable for marketing reasons.

Imo, you need about 40 IO to do a good cnc setup of moderate complexity.
It is feasible, and imo perfectly fine, to hand off maybe 50-70% off
that to relay logic.
But, since IO is cheap in quantity, I would prefer to automate this in
sw in the control.

Things like spindle automation are critical.
Coolant pressure, oil pressure, air pressure, spindle orientation, atc
lock, spindle_open, spindle_closed.

Desirable are things like light bars green/yellow/red, door interlocks,
mist/flood coolant and washdown stuff etc.

I have ac brushless servos, and more on the way.

They can use analog io, or step/dir. I much prefer step/dir.
With differential signals, ie pulse+/pulse- etc. they are pretty much
noise immune.

Today, the ac brushless servos are really cheap.


For comparison-
I am using the excellent CSMIO-IPS board from CSLabs.
A good setup is about 1000€.
Extended IO, encoder support board, MPG board.

It is vastly better than anything else for mach3. There is just no
comparison.
Excellent drivers, with no gotchas like with the SS.
http://www.cs-lab.eu/en/index.php?m=article&s=main&aid=113&uinfo=MACH4_by_ArtSoft_Newfangled_Solutions


On 19/06/2014 18:12, Jon Elson elson@... [CAD_CAM_EDM_DRO]
wrote:

> I'm not sure what "subspindle hand-off" means. I tried to
> look it up, but maybe you can describe exactly what you
> want the sub spindle to do.
>
> Jon

--
-hanermo (cnc designs)