Folding. Splitting the bottom bed.

[Paul G]

I had some folding to do where folds were a metal thickness out of line, so that when the last fold is done
the spot welding tab slips inside the other surface.

Also one edge is a fold up where as previous folds were fold down. ( See photo's )
Apart from sectional Vee beds on brake presses this is seldom possible on conventional folders.


The top fingers on a box & pan are always different sizes and usually tee nuts are used so that any width
can be catered for, but not the bottom bed. I cut some 40 x 12 bright to length to fit this particular job and
it worked so well that I'm now trying to fathom out a way to make a set of bed pieces that would cater for
all lengths of fold. My maths has failed me.
I may be flogging a dead horse.

Paul G

 

[Kent]

I am confused from the text what your attempting but an edge joggler will do what I think you require easier than a folder

 

[Screwdriver]

Well if you want to be able to go up in increments of one (inch, cm, foot) without using more than 3 pieces:

1, 2, 4, 8 pieces will give you 1 to 12 inclusive using a max of 3. Chuck in a 1.5 and you have fractions and of course, a single 12 will give you everything up to 24 etc.

 

[Paul G]

An extra pic may help.
Order of folds A B C D

The folder is 1.25m or 50"

 

[waddycall]

Have a look at sectional sizes for press brake dies. These will have been worked out from experience/demand.

http://marketing.wilsontool.com/acton/attachment/8311/f-00f4/1/-/-/-/-/2bc_europb.pdf

 

[Paul G]

I'm contemplating drilling & tapping more holes in the leaf that holds the bottom bed.
At the moment the bed fixings are 200mm cts (M10). If they were 100 cts then I would be able to add smaller pieces.

If the bed bar was drilled every 25mm then this would give me even more options.

Paul G

 

[hotrodder]

Slotting the bolt holes for the new bending leaf 'fingers' would get it closer to the versatility of the hold down fingers. Obviously you'd still need more tapped holes in the bending leaf itself as already being considered

Another, albeit less versatile way, would be a mish mash of the hold down bar arrangement on Gabros (cut to length as needed) and Magnabenders which have a slotted clamp bar for when folding stuff with small returns

 

[Paul G]

Slotting the bolt holes for the new bending leaf 'fingers' would get it closer to the versatility of the hold down fingers. Obviously you'd still need more tapped holes in the bending leaf itself as already being considered

Another, albeit less versatile way, would be a mish mash of the hold down bar arrangement on Gabros (cut to length as needed) and Magnabenders which have a slotted clamp bar for when folding stuff with small returns

At the moment I have 7 off m10 threads @ 200mm centres. 18 off extra holes would give me 50mm centres.

I'll try that and take it from there.

It's the "cut to length as needed" method that I'm on at the moment. I already have a dozen bits but every time I have a new
bending job comes in I end up making more, or re-drilling existing ones.


Cheers
Paul G

 

[Maker]

Well if you want to be able to go up in increments of one (inch, cm, foot) without using more than 3 pieces:

1, 2, 4, 8 pieces will give you 1 to 12 inclusive using a max of 3. Chuck in a 1.5 and you have fractions and of course, a single 12 will give you everything up to 24 etc.

That would work if he had a tee slot to bolt to, but not with a series of bolt holes (Unless they were only an inch apart).