On the two direction motion thing, Both Barrafaldi and Duplomatic will work in
both directions....I programmed mine to take the shortest route to the called
up tool......There is more to this than just rotating a tool into place. You
should be able to call up the tool like this.....
Say it is on tool #3 and you want to go to tool #8 with offset #4......Your
command would be T0804.....The turret should unclamp and rotate the shortest
route to tool #8, clamp the turret and load the offset #4 to the cnc
software....With an electric turret this is a pretty easy thing to do providing
the control (Ladder) has the compare function and the cnc side of the software
can read ladder data tables to get its tool offset from.......
Dave
----- Original Message -----
From: Jim Coleman
To: Enhanced Machine Controller (EMC)
Sent: Friday, March 07, 2008 7:29 PM
Subject: Re: [Emc-users] Powerdex Tool Changers
what about sliding a pin into the turret when its in place to lock it? then
no lifting is needed, just rotate about it's axis and lock. maybe pins coming
in from the sides in multiple locations to help rigidity? a mechanism similar
to the self centering thing on tap wrenches, the outward spiral type guide...
then you rotate that ring to engage the pins... taper the entrance to the pin
holes on the turret to allow it to pull into place if it's indexing isnt the
greatest. I would try to rough out a quick drawing to try to help depict my
thoughts but i guess i dont have any cad installed on this computer, so i hope
you're able to visualize what im trying to describe. it actually looks kinda
purdy inside my head, assuming the mechanism would actually work.
on a side note... when you huys see HAL, do you think of it as 3 letters,
like LED or SUV, or d oyou think of it as a single word, like the name...
kinda like shallow Hal? noticed you referred to it as "an HAL module" and i
usually think "a HAL module" which would imply it's being said as if it were a
name. Not like it really matters, just the thoughts churning in my head....
Jim
On Fri, Mar 7, 2008 at 7:03 PM, Kirk Wallace <[EMAIL PROTECTED]> wrote:
On Fri, 2008-03-07 at 17:05 -0500, Dave Keeton wrote:
> If it is like a Barrafaldi or a Duplomatic I can help......I have
installed
> both of these.......It looks alot like them and I would assume they use
the
> same kind of encoder. Reading the encoder is fairly easy using ladder, If
> you happen to have FAPT Ladder III editing software I can send you what I
> wrote for this. I installed a Duplomatic turret on a Fanuc 21i TB
controlled
> lathe about 6 months ago. Alot of these turrets are built and operate
pretty
> much the same. I can get you the time and operation sequence if you need
it.
> Timing on these turrets is critical. Control (including propagation delay)
> should be very accurate to +- 10ms or it will mis-index. What questions do
> you have?
I have my Hardinge HNC turret working through an HAL module. Part of
what makes EMC and HAL so cool is that it allows someone with my skills
to make it work.
I am looking for general design examples, in order to try to come up
with a design for lathe tool changers for Sherline and bench-top class
machines. The issues that are bothering me now are how to stop the
turret in eight positions, with high accuracy and rigidity. The Hardinge
accomplishes this by having just one broad and short zero clearance
interface between the movable turret table and the carriage. Plus a
pneumatic piston which clamps evenly across the table. I won't be using
pneumatics, so I can't utilize the Hardinge design for clamping. And the
other examples I have seen don't have the two direction motion (rise
rotate, park) of the Hardinge, suggesting a different internal design
altogether.
Checking the Barufaldi and Duplomatic links:
http://www.baruffaldi.it/eng/interne/prodotti/macchine_utensili/index.html
http://www.duplomatic.com/duplomatic/auto/uk/2/frame2.html
reminded me that I need to worry about live tooling too. ;)
--
Kirk Wallace (California, USA
http://www.wallacecompany.com/machine_shop/
Hardinge HNC lathe,
Bridgeport mill conversion, doing XY now,
Zubal lathe conversion pending)
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