Hello All,
For my first post here, an embarrassing question that I just can't figure out.
I'm working on a reproduction Morris chair and have to stem bend the back-slats. The direction for the radius of the back-slat is as follows:
The slats have a radius of 23-inch. To ben them, I sandwich them in a shop-built form made from two bandsaw blocks that mate to create a 22-inch radius which overbends the wood a little to allow for inevitable springback.
Dim: The length of the back-slate is 21-3/4".
I get the initial radius of 23-inch -
- measure 21-3/4" our as two parallel lines (length of the back-slat),
- Find a center point of the 21-3/4" and using a trammel or string or whatever, make an arch between the two parallel line 23-inches up from the center point.
I get that, all good.
It's the part about '22-inch radius which overbends' to reduce the spring back. Just shortening from 23-inch to 22-inch doesn't make your radius more 'tight', it just makes a closer concentric arch.
What the hell is he talking about - I don't get it. What is am I missing that reducing the radius makes a tighter radius?
Thanks - Patrick