First the admission: I failed miserably at trying to remove a warp from a horn blank using dry heat.
The failing process:
Using a countertop toaster oven I heated a badly warped horn blank to about 325 degrees Fahrenheit for about 20 minutes. It showed no signs of pliability, so I raised the temp to 350 and left it for 30 minutes. When I came back it was significantly blistered, but I put it between angle Irons in a bench vice and cranked down. As I tightened it I heard several cracks.
After cooling overnight I took it out of the jig. It was flat as a pancake, but horribly blistered. I attempted to sand off the blistered surface, but the horn underneath appears to be ruined as well.
Pictures (so you can have a good laugh):
So, the fried blank now belongs to my artiste wife who thinks it's the coolest thing since sliced bread.
Advice on where I went wrong is greatly appreciated... Too hot? Too long? Too hot and long? Leave it to the professionals?
The failing process:
Using a countertop toaster oven I heated a badly warped horn blank to about 325 degrees Fahrenheit for about 20 minutes. It showed no signs of pliability, so I raised the temp to 350 and left it for 30 minutes. When I came back it was significantly blistered, but I put it between angle Irons in a bench vice and cranked down. As I tightened it I heard several cracks.
After cooling overnight I took it out of the jig. It was flat as a pancake, but horribly blistered. I attempted to sand off the blistered surface, but the horn underneath appears to be ruined as well.
Pictures (so you can have a good laugh):
So, the fried blank now belongs to my artiste wife who thinks it's the coolest thing since sliced bread.
Advice on where I went wrong is greatly appreciated... Too hot? Too long? Too hot and long? Leave it to the professionals?