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

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
> > in
> > order to achieve length where I need).
> > Darren Lucke
> >
> > --- Andy Wander <awander@...> wrote:
> >
> > > 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
> >
> >
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> http://groups.yahoo.com/group/jobshophomeshop I consider
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> same members are there, for OT subjects, that are not allowed
> on the CCED list.
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> NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY
> POSTING THEM. DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO
> EXCEPTIONS........
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