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

Where do I send the money for one? I would rather
have the driver on-board w/ the ELS I think (save the
100 bucks ~altho those geckos are the greatest thing
since sliced bread~?).

What about a switch interface when first bend is
completed to adjust to the next length? Possible?
Sometimes one would not be able to punch a go button
if you had a larger piece safely?
Darren Lucke

--- John Dammeyer <johnd@...> wrote:

> Hi Darin,
>
> There's not that much 'electronic' knowledge
> required. You'll end up
> needing to build a power supply just like what's
> needed for CNC but just a
> single axis. The ELS will have a driver built in
> but a GECKO driven from
> the ELS (or Paul Kelly's module) would work too.
>
> And that's essentially it. Stepper motor to driver
> module to power supply.
> Controller to driver module. Enter commands and
> press go. ( or whatever ).
>
> The ELS will require mechanical fabrication for a
> box and frame or something
> to steady the button extensions. But that's going
> to be simple since you're
> already doing metal fab.
>
> Once we finalize the ELS, I'm sure someone will step
> in and start assembling
> them for those who don't want to do the electronics.
> I designed it to use
> primarily surface mount parts so that a machine
> could do all the hard work
> so there's very little hand soldering needed.
>
> But the current revision of the board has my encoder
> control sitting too
> close to the start and stop buttons so I need to
> change the layout. That
> will happen after the software is complete.
>
> John
>
>
>
>
> Wireless CAN with the CANRF module now available.
> http://www.autoartisans.com/products
> Automation Artisans Inc.
> Ph. 1 250 544 4950
>
>
> > -----Original Message-----
> > From: CAD_CAM_EDM_DRO@yahoogroups.com
> > [mailto:CAD_CAM_EDM_DRO@yahoogroups.com] On Behalf
> Of Darren Lucke
> > Sent: Wednesday, April 05, 2006 10:20 AM
> > To: CAD_CAM_EDM_DRO@yahoogroups.com
> > Subject: RE: [CAD_CAM_EDM_DRO] Press brake auto
> back stops -
> > DRO / Accuracy
> >
> >
> > Yeah, the mechanical part I'm comfortable w/
> designing
> > from looking at other actual units, using them,
> etc
> > and familiar w/ taking lash out as you described.
> A
> > lot of commercial stops have a stop the whole
> width of
> > press / dies which then sometimes have moveable
> stops
> > on it to facilitate narrow or wider pieces.
> >
> > I was hoping there might be a way to do this w/o
> using
> > dedicated comp running mach or other and also how
> > would one have some kind of switch to actually
> > activate it to go to the next position other than
> > doing it manually. Sounds like John's idea would
> be
> > good but I do not know enough about it and I do
> not
> > know quite enough of electronics to design my own
> I'm
> > afraid. Perhaps one could buy a board to work for
> > this? I have gotten motors spinning through mach3
> and
> > my plasma table is nearly complete but am starting
> to
> > gather info for the next project so am comfortable
> > enough working w/ power supplies, etc.
> >
> > Darren Lucke
> >
> > --- Andy Wander <awander@...> wrote:
> >
> > > Well, I haven't built one, but my guess is a
> couple
> > > of threaded rods
> > > would be accurate enough to get the .01"
> accuracy
> > > you are looking for,
> > > along woth(as John suggested) a small stepper
> > > driving the 2 rods.
> > >
> > > I would actually figure out a way to mount 2
> solid
> > > rods to the back of
> > > the brake, so that they can be the "rails" that
> the
> > > fence or back gage
> > > or back stop or whatever we are calling it
> slides
> > > along. Put these rods
> > > in place so that their top edge is at the same
> > > height as the top of the
> > > lower die in the brake, so that when you slide
> the
> > > sheet metal in, it
> > > will ride along the top of the rods, holding it
> > > level(this will only
> > > work if the sheet is wide enough, obviously, but
> if
> > > it is not that wide,
> > > support should not be an issue).
> > >
> > > Then I would figure out a way to mount 2 pieces
> of
> > > allthread(or 1 piece,
> > > centered, if you can get good bearings on the
> > > support rods, that will
> > > allow the fence to slide easily and stay
> > > perpendicular). These should be
> > > held at one end by a mounted bearing that will
> allow
> > > rotation but no
> > > longitudinal motion, like the leadscrews on a
> lathe
> > > or mill. The other
> > > end, if not too long, could be left floating
> after
> > > it passes through the
> > > nuts on the fence.
> > >
> > > If you go the allthread route, there will
> probably
> > > be a good amount of
> > > backlash, but you should be able to use the
> motor to
> > > always approach
> > > from the outside in(when you move out, you go
> > > further than you want to,
> > > and then come back in) so you can get rid of the
> > > backlash. You will want
> > > to have the threaded rod pushing the fence in
> > > anyway, so that pushing
> > > the sheet against it does not move it by
> whatever
> > > amount of backlash you
> > > have. Mounting a DRO to the fence should allow
> you
> > > to confirm the actual
> > > position.
> > >
> > > You could do all of this with mach3 and a linear
> > > encoder. I am sure
> > > there is other software that would do it as
> well.
> > >
> > > Just a few thoughts...
> > >
> > > ________________________________________
> > > Andy Wander |
> > >
> > >
> > > -----Original Message-----
> > > From: CAD_CAM_EDM_DRO@yahoogroups.com
> > > [mailto:CAD_CAM_EDM_DRO@yahoogroups.com] On
> Behalf
> > > Of Darren Lucke
> > > Sent: Wednesday, April 05, 2006 12:38 PM
> > > To: CAD_CAM_EDM_DRO@yahoogroups.com
> > > Subject: RE: [CAD_CAM_EDM_DRO] Press brake auto
> back
> > > stops - DRO /
> > > Accuracy
> > >
> > > The main thing I need is an accurate back stop
> so
> > > that
> > > the slippage, etc can be repeatable (and square
> w/
> > > ram
> > > - dies). I would make a pressbrake that would
> have
> > > a
> > > top ram movement in vertical rather than box and
> pan
> > > style. My parts would be quantity of this or
> that
> > > and
> > > would be nice to be able to repeat the length of
> the
> > > bend (adjust a few thousandths one way or the
> other
>

=== message truncated ===


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