Kerfing Nomex Panels.

[wes616]

Thought I'd post this here before heading home for the day. Any ideas about defining an explicit formula for kerfing nomex panels. Right now our shop does this process by trial and error, but we need to determine something more explicit than this quality purposes. I can't seem to come up with anything that will work (beyond trial and error approximations)...

Does anyone know of a formula (or a place to find a formula) that will relate the kerfing cuts to bend radius. (or am i just forgetting some basic geometry here)?



Wes C.
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When they broke open molecules, they found they were only stuffed with atoms. But when they broke open atoms, they found them stuffed with explosions...

 

[GregLocock]

Basic geometry should get you there. If you know the desired outer radius and angle of the curve, and the thickness of the panel, then you can easily work out how much of the inner skin to remove.

For instance, 90 degree bend in 20mm panel, desired outer radius is 100mm. So, the inner skin has a radius of 80mm, so it will need 90/360*2*pi*(100-80) mm of skin removing.



Cheers

Greg Locock

Please see FAQ731-376 for tips on how to make the best use of Eng-Tips.

 

[Biggie1]

If you need the formula for crush bends this is how it go’s

2pi * W * D / 360

W = width of board

D = degree of bend

So on 0.400 board you would have to remove 0.628 of skin.

Hope that helps.

 

[berkshire]

Try (R* .01743)*A this will give you the stretch out for the bend. Subtract the inner stretch from the outer.
So gregs example would give outerskin 156.87mm minus inner 125.49. leaves 31.38mm to be divided into sawcuts for your kerf.
B.E.