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Questions About Bending Brake

 
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bill_dom(at)yahoo.com
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PostPosted: Sat Feb 25, 2006 12:15 pm    Post subject: Questions About Bending Brake Reply with quote
Does the material have to be flat before bending? Not
twisted.

Does ZAC 48 brake need welding? Can it be gas welded?

What is the best way to cut .040 thick materials?

Ive been experimenting with a wooden bending brake
with mixed success. When I bend L angles of .040 and
40 long it comes out twisted and slightly bowed. The
material is not flat and it is twisted before bending.
I have the suspicion that the snips are causing this
twisting in the material by stretching the border
while cutting it. If the border is slightly larger
than the center this may cause the twist and the
bowing after the bending. My wooden brake is very
solid and straight and I can't see any bowing or
twisting of the brake while bending.
William Dominguez
Plansbuilt 601XL

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Ron Lendon



Joined: 10 Jan 2006
Posts: 685
Location: Clinton Twp., MI
PostPosted: Sat Feb 25, 2006 3:11 pm    Post subject: Re: Questions About Bending Brake Reply with quote
I have had the same experience with narrow strips. I used the Malco hand shears to cut one of the doublers for the rear stabilizer spar. Both edges were cut by hand and it twisted. When I held it flat though the edges were straight. I bent it in a press brake and it became curved and twisted. Next time I will either shear or score break the trim edge. The other 3 doublers were shear cut and lay flat. The one I had cut was a remake and should have been shear cut.

If you are good with a hammer and a dolly block you can stretch the edges back out and it will lay flat. It just takes a lot of patenience and care.

I am going to use the strip as it will be held in place by the spar itself. More will be revealed as I get it closer to riveting.

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_________________
Ron Lendon
WW Corvair with Roy's Garage 5th bearing
CH 601 XLB
N601LT - Flying
http://www.mykitlog.com/rlendon
Corvair Engine Prints:
https://sites.google.com/site/corvairenginedata/
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Tebenkof(at)aol.com
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PostPosted: Sun Feb 26, 2006 10:48 pm    Post subject: Questions About Bending Brake Reply with quote
William,

FWIW I have used my wood cutting band saw with 18 tpi blade for cutting most
thicknesses of aluminum sheet and extrusion. The cuts definitely needs
smoothing with a file, and for long cuts it is hard to avoid some wandering.
Still, in the absence of a good shear I have often found it to be most
convenient. It does not distort the material at all.

Jim Greenough

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rjscep(at)yahoo.com
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PostPosted: Mon Feb 27, 2006 5:46 am    Post subject: Questions About Bending Brake Reply with quote
Quote:
I am using the Malco shears tool. I mounted it on a
piece of 2x3 block and bolted on a table. I intend
to use a guide and feed my large sheets of
aluminum and cut them that way. You need two
people however to do this cutting. I hope to get a
pic on here to show how its done. I hope to make
it adjustable for the many sizes to be cut.

--- Tebenkof(at)aol.com wrote:

Quote:


William,

FWIW I have used my wood cutting band saw with 18
tpi blade for cutting most
thicknesses of aluminum sheet and extrusion. The
cuts definitely needs
smoothing with a file, and for long cuts it is hard
to avoid some wandering.
Still, in the absence of a good shear I have often
found it to be most
convenient. It does not distort the material at
all.

Jim Greenough





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