Re: Press brake auto back stops - DRO / Accuracy

Actually calculating setback's and bend radi is not an issue. It's
been done manaully for years and w/ a simple CAD system or some
simple math it can be done very quickly. I recommend doing a sample
break on a pc of scrap mat'l [ if your going for 0.01" accuracy] but
otherwise these formula's will get you VERY close.
Check out http://www.thefabricator.com/Bending/Bending_Article.cfm?
ID=356 or search on google about how to set out bend radi. The
basic's of it is knowing what thickness your mat'l is. Most metals
and alum will form around the centerline of the mat'l. You also need
to know the form radius [ the inside rad of the corner after formed]
then calculate your part length of your part [after its formed]
using your lip sizes and your radius. The total part length will be
the length of the centerline of the mat'l of the formed part.
Simple. The break location is the center of the formed corner rad.
Which can also be easily calculated. Or if you want to spend money
on programing, buy SolidWorks, its what I use and its dead accurate
and fast, and programable for mat'ls which don't form on the
centerline of the mat'l.

Jarrett Johnson

<jkbrennan@...> wrote:

>
> Look at this:
> http://www.ascendancy-software.co.za/products/pressbrake/index.php
> The situation as I see it is not a problem in building an
> adjustable controlled backstop , but is knowing where to set it

for

> work with different material conditions. Empirically this can

be

> accomplished, but for one off jobs without set losses as you seem

to

> desire is another story.
> jesse
>
> On Apr 5, 2006, at 11:37 AM, Darren Lucke wrote:
>
> 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
> >
> > -----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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aol://5863:126/

> rec.crafts.metalworking or go thru Google.com to reach it if you

have

> trouble.
> http://www.metalworking.com/news_servers.html
>
> http://groups.yahoo.com/group/jobshophomeshop I consider this to

be

> a sister site to the CCED group, as many of the same members are
> there, for OT subjects, that are not allowed on the CCED list.
>
> NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY

POSTING

> THEM. DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO

EXCEPTIONS........

> bill
> List Mom
> List Owner
>
>
> Yahoo! Groups Links
>