Hi all,
Off the wall ... or out of the box. Rotate with a servo motor and
lock with a caliper as in disc brake.
I think it takes about 800-1000 psi to really set a caliper....so
maybe an air can as in air brake to hydraulic
cylinder to supply the pressure. A 2500 ppr encoder in quadrature
gives decent precision.
Just thinkin'. Dangerous I know. ;-)
Dave
On Mar 7, 2008, at 4:29 PM, Jim Coleman wrote:
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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