Warped form

[Mad Max]

How do you straighten your form?

This is a 64" R/D form 1 piece.
I have used 3/16" and 1/4" thick angle iron but sometimes it takes 1 on each side.

Holding a straight edge to the form there was a gap about 3/16" in the middle.
I needed a 3rd hand, picture did not turn out good.



Sometimes I use 1" x 3/16" flat bar, drill three 1/4" holes, one on each end and one in the middle.
Tighten the outside ones flat to the form, All thread with a nut on the inside and screw it out until flat, 2nd nut to lock it down.
Very little tension on this one, I turned the all thread by hand.

[mmattockx]

Now that's a problem. Is it flexible enough that you can force it back straight and then fasten another layer of plywood or a steel angle to brace it in that position? Maybe even a piece of plywood on each side to significantly increase the thickness after being put straight?


Mark

[Stagmitis]

Curious what material the form is made of.

[Mad Max]

Now that's a problem. Is it flexible enough that you can force it back straight and then fasten another layer of plywood or a steel angle to brace it in that position? Maybe even a piece of plywood on each side to significantly increase the thickness after being put straight?


Mark

Plywood is high $, the form is made with 7 ply. plywood, If I push on it with the screw past flat and leave it like that after a few months it may become straight, I did that on a different one and it worked.

[Roy from Pa]

The form isn't the only thing in your shop that's warped:)

 

[Mad Max]

Form isn't the only thing in your shop that's warped:)

 

It's me It's me Ernest T

[Buggs]

Have you thought about glueing it up while clamped to a flat, level surface and sealing it with bar top epoxy.

You must live in a humid climate?

[Mad Max]

Have you thought about glueing it up while clamped to a flat, level surface and sealing it with bar top epoxy.

You must live in a humid climate?

Yes It was flat years ago, I have a dehumidifier running for years and it sat on a rack for years also, I make Recurve mostly

[Kirkll]

I'm not sure whether it will work on your plywood or not, but i have sanded the wood to raw wood both sides and wet down the crown side and put weights on it. it may take a few days in warm weather, but it should come back with moisture introduced. You are basically warping it back to straight again.

 i've fixed many warped doors using this technique and solid wood planks too.  With your form, once you get it straight again, edge band it with oak or even use the flat iron, or angle iron. Then seal it really well.     Kirk

[Mad Max]

I finished the bow Yesterday with the form, I have several that I did this way.
That one I have not used in a while.

[Mad Max]

I'm not sure whether it will work on your plywood or not, but i have sanded the wood to raw wood both sides and wet down the crown side and put weights on it. it may take a few days in warm weather, but it should come back with moisture introduced. You are basically warping it back to straight again.

 i've fixed many warped doors using this technique and solid wood planks too.  With your form, once you get it straight again, edge band it with oak or even use the flat iron, or angle iron. Then seal it really well.     Kirk

We use to pour water under cupped stacked 1 x 6 yellow pine back in the day

[Kirkll]

You can excellerate the process using a wet cloth and an iron too. Steam infused…

The slightly bent forms are not a big deal. It’s the twisted ones that will give you the blues….   Kirk

[Mad Max]

Yep