Re: [CAD_CAM_EDM_DRO] Re: Press brake auto back stops - DRO / Accuracy

Exactly what I'm looking for! Mechanical end
(mechanical backstops are easy enough to build), I can
come up w/ something but the electronics end
implementing the actual stop movement, cycling to next
length bend, etc is where I'm searching for. Wish I
could afford to go buy one, but you know... I'm still
trying to mine the copper to help pay for my last
project's wiring. ;-)
Darren Lucke

--- jerryflyguy <hjjohnson@...> wrote:

> We have an 'Acupress' 250T brake here at the shop.
> It is fully
> programable and will calculate bend allowances and
> setback's if you
> want it to, or you can just set your backgauge. If
> your talking
> about a vertically acting top die and fixed bottom
> die brake, then
> you'll not have issues w/ slippage. The mat'l will
> be pulled into
> the bottom [female] die evenly from both sides of
> the die. I daily
> program and design parts to be broke on it and we
> achieve less than
> 1/32" accuracy w/out really trying. If we need to up
> that a bit more
> we can but for our type of work its not nesc.
> Typically the
> project's that I'm involved w/ are laser cut to size
> w/ etch marks
> on the mat'l that match the flat partern layout for
> the brake
> operator. He imputs the backstop value's in decimal
> form and then
> brakes the parts. It works and is repeatable every
> time. If the
> parts aren't laser cut they are usually cut on our
> AcuShear which
> also has a NC backgauge. The only time you get into
> issue's w/
> slippage not being uniform is when your using too
> large a die set
> for the lip sizes your breaking. ei; if you want to
> break a 1 1/2"
> lip your gonna need a die smaller than 3" open at
> the top. If your
> gonna brake a 1/2" lip the die must be less than 1"
> open at the top.
> if not, then the mat'l may move in an unpredicatable
> manor because
> when the top die comes down on the mat'l the mat'l
> isn't resting on
> both sides of the bottom die and it will slide.. who
> knows where....
>
> Anyway.. the short answer is it works and its
> repeatable.
>
> Jarrett Johnson
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "Andy
> Wander" <awander@...>
> wrote:
> >
> > Darren:
> >
> > I have had only a bit of experience with a press
> brake, and it is
> not a
> > very good one at that(a Harbor Freight cheapy),
> but I will say
> that it
> > is a lot more difficult to figure out where the
> bend is going to
> > actually happen on a press brake, as the material
> can(and must!)
> move
> > across the tops of the female V jaws during the
> bending process,
> and
> > this means that the actual center of the bend may
> not end up where
> you
> > expect it to be.
> >
> > I am concerned that no matter how accurate your
> back gage, the
> amount of
> > slippage of the metal may actually be the thing
> that determines
> your
> > repeatability.
> >
> > What thickness of what type of metal do you need
> to bend? And do
> you
> > need to make boxes, or simple bends only?
> >
> >
> >
> > ________________________________________
> > Andy Wander | Vice President, Engineering
> >
> > -----Original Message-----
> > From: CAD_CAM_EDM_DRO@yahoogroups.com
> > [mailto:CAD_CAM_EDM_DRO@yahoogroups.com] On Behalf
> Of oneluckeboy
> > Sent: Wednesday, April 05, 2006 11:54 AM
> > To: CAD_CAM_EDM_DRO@yahoogroups.com
> > Subject: [CAD_CAM_EDM_DRO] Press brake auto back
> stops - DRO /
> Accuracy
> >
> > Anyone ever make an auto back stop for a press
> brake? Just
> curious if
> > anyone had and what construction method they had
> maybe used? I'm
> > considering making a small press brake for bending
> metal as the
> local
> > shop takes ~FOREVER~ to do pieces for me. It'd
> sure beat
> waiting.
> > Looking at something with DRO and accurate
> movements.. ie backstop
> move
> > to 4.050" from 2.250" and back again or some such
> for bending
> small
> > brackets, gussets, etc every other bend. I would
> like to see
> something
> > w/ resolution - accuracy around .010" or less as
> long as it would
> be
> > repeatable?
> > Darren Lucke
> >
> >
> >
> >
> >
> >
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