I just attempted to bend some Mahogany sides, with a cutaway, thickened to .87-.90 in a Fox style bender. When I took them out there was what I can only describe as "wrinkles" or "ripples" at the waist and cutaway on the outside. It also occurred on the inside at the adjacent part of the cutaway. I wrapped the sides in foil with a light spritzing of water, slat-wood-heating blanket-slat, started to bend around 250 degrees then cooked around 350 for 5 minutes then cooled and removed. I used the LMI temperature controller. Does anybody know what happened to cause this. I bent a second piece with same results. These are practice sides from LMI, I believe they are Mahogany.
Mahogany can be a bit difficult to bend sometimes. My guess, knowing nothing more than your description is you started bending a bit under temp, especially for Mahogany. Also think your wood was a slight bit thick. My max thickness is .85 and .75 on the cutaway area. Good thing to practice.
Thanks Glen I will try with thiner sides. What do you recommend as far as a temperature to start bending?
Here a couple of pics of my bending issue.
Thanx Glen, I will try again today. I am also wrapping the wood in foil, I have heard of people using parchment paper as well, what is the difference?
I did not expect cracks to look like that, it looks more like the wood is compressing in those areas. I can sand them out, they don't go all the way through to the other side. i have only bent by hand before, so I have never seen this. Thanx again for your input, much appreciated.
I always experienced cracks on the convex side when hand bending, I have never seen them on the concave side, so I find this very puzzling, plus I have never bent Mahogany, only maple. I also experienced the foil leaving small wrinkles in the wood, maybe because mahogany is so soft compared to other woods. So you only have the bare wood in contact with the blanket and slat?