The way that is breaking I don't think you going to have much luck.
How about laminating it with qs Hog on the inside? Might just work.
| Official Luthiers Forum! http://www.luthiersforum.com/forum/ |
|
| Advice for bending old, brittle wood http://www.luthiersforum.com/forum/viewtopic.php?f=10101&t=46515 |
Page 1 of 1 |
| Author: | James Ringelspaugh [ Thu Oct 15, 2015 10:20 pm ] |
| Post subject: | Advice for bending old, brittle wood |
I have been charged with bending some old mahogany sides that are super brittle perpendicular to the grain... it snaps in two easily when pressed like this: Any advice for bending on a fox bender? I'm thinking high heat, very little water, and go very slow but if anyone has some tricks up their sleeve I'm all ears... |
|
| Author: | meddlingfool [ Thu Oct 15, 2015 10:40 pm ] |
| Post subject: | Re: Advice for bending old, brittle wood |
Adding SS2? |
|
| Author: | Colin North [ Fri Oct 16, 2015 2:30 am ] |
| Post subject: | Re: Advice for bending old, brittle wood |
Does that look a bit like run-out to anyone else? |
|
| Author: | bluescreek [ Fri Oct 16, 2015 5:47 am ] |
| Post subject: | Re: Advice for bending old, brittle wood |
sometime it just doesn't want to be a guitar. I would use slat wet paper wood ( treated with SS@) wet paper blanket then top slat. start bending at 275 on the lower bout. then upper then waist checking to be sure the wood is damp. then take to 350 F . Once the temp is reached turn off and let cool . I may cycle a 2nd time to 250 to get the water out. |
|
| Author: | ernie [ Fri Oct 16, 2015 6:53 am ] |
| Post subject: | Re: Advice for bending old, brittle wood |
I/m bending old walnut bindings now sand to .065, I soak the bindings for at least 1 hr, 3hrs for bloodwood and proceed with john /s instructions above |
|
| Author: | Bobc [ Fri Oct 16, 2015 7:41 am ] |
| Post subject: | Re: Advice for bending old, brittle wood |
The way that is breaking I don't think you going to have much luck. How about laminating it with qs Hog on the inside? Might just work. |
|
| Author: | Rodger Knox [ Fri Oct 16, 2015 11:44 am ] |
| Post subject: | Re: Advice for bending old, brittle wood |
That's going to need to be very thin, maybe even less than the .065" recommended. I've gone down to a little less than .06" with bloodwood, but that's much denser than mahogany. John's instructions probably have the best chance of working. |
|
| Author: | James Ringelspaugh [ Fri Oct 16, 2015 12:13 pm ] |
| Post subject: | Re: Advice for bending old, brittle wood |
Bobc wrote: The way that is breaking I don't think you going to have much luck. How about laminating it with qs Hog on the inside? Might just work. I am starting to think this might be the only way... a couple of .05" laminations. Oh well I'll try it at .08" first and see how it goes. It's a dread so the curves aren't too severe... wish me luck folks |
|
| Author: | Bobc [ Fri Oct 16, 2015 12:57 pm ] |
| Post subject: | Re: Advice for bending old, brittle wood |
Good luck James. Take it slow |
|
| Author: | Ken Jones [ Fri Oct 16, 2015 11:10 pm ] |
| Post subject: | Re: Advice for bending old, brittle wood |
That's exactly why I adopted the "flatsawn-to-quartersawn" approach (discussed in another thread) to cutting my linings -- it eliminates runout, and consequently, breakage during bending. Sent from my iPhone using Tapatalk |
|
| Author: | Mike OMelia [ Wed Oct 21, 2015 7:27 am ] |
| Post subject: | Re: Advice for bending old, brittle wood |
Ken, would u please link that thread here? |
|
| Author: | James Ringelspaugh [ Wed Oct 21, 2015 10:43 pm ] |
| Post subject: | Re: Advice for bending old, brittle wood |
Oh well, didn't work. This wood just has zero strength... I thinned to .08", sprayed w/ supersoft II, then bent really hot and slow the next day, so hot I thought it would char the wood. Failures were just in a couple of spots but being mahogany it sticks out like a sore thumb. To think... all the crazy tight cutaways I've bent with no problems but I couldn't even pull off a dreadnought shape with this stuff. :Sadface. |
|
| Author: | meddlingfool [ Wed Oct 21, 2015 11:36 pm ] |
| Post subject: | Re: Advice for bending old, brittle wood |
If you have more, try going to .04 and doing double sides? |
|
| Author: | bluescreek [ Thu Oct 22, 2015 5:58 am ] |
| Post subject: | Re: Advice for bending old, brittle wood |
hot and slow is not what you want. you should be done bending in 4 minutes. be sure you have moisture . |
|
| Author: | Haans [ Thu Oct 22, 2015 6:13 am ] |
| Post subject: | Re: Advice for bending old, brittle wood |
Just chuck it. |
|
| Page 1 of 1 | All times are UTC - 5 hours |
| Powered by phpBB® Forum Software © phpBB Group http://www.phpbb.com/ |
|