Re: Bending dish ribs any tips or tricks?
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You can hand form the box section .
Find a 1m length of good solid hardwood - something like 35-50mm thick and cut a square hole through the thickness such that the section to be formed will just pass .
Clamp wood into a solid bench vice or one mounted on a solid pillar drill stand , with the square hole set to have its sides vertical and horizontal .
Pass the section through the hole and apply a gentle downwards force at around 1 metre from the hole .You will be able to "feel" the required effort needed to bend the section .
Remove section and offer up to your rib template to determine if bend is conforming to the shape - reverse thrust if required or try bending more if needed.
It is better to underbend at this stage as work hardening will occur with each applied effort stroke .
When happy push section approx 100mm further through hole than the first bend point and repeat the bending stage - remove and test each time you perform a bend and progress along full rib length ,testing against template as you go .
Ensure the hole does not move from its initial set point and that the applied force is vertically downwards , to avoid any tendency to spiral the formed section.
Although a slow process you should finish up with the full rib following the template and it should be plenty good enough into the mid microwave area .
On Wed, 26 Aug 2020 at 16:22, David Law <law1274@...> wrote:
Hi, I'm on Mk2 of my 4m 0.38f/d dish project this time using traditional square tube and stiffening ribs.