TONY !! In The Mando Section ??? He musssssssst be Lost !
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No Goat pics here , please move along in an orderly fashion !
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| Question about "potato chip" effect http://mowrystrings.luthiersforum.com/forum/viewtopic.php?f=10128&t=36939 |
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| Author: | cphanna [ Tue Jun 26, 2012 11:55 am ] |
| Post subject: | Question about "potato chip" effect |
Hello, Friends, I have an x-braced back with induced arch in both axis. Earlier this spring, I ran out of time and ideal humidity to glue this back to the box. Predictably, it has "potato chipped". The effect isn't bad, but it has definitely straightened along the heel-to-tail axis. I have no plans to resume this project until late autumn or early winter when the humidity lowers in my shop. I'm curious as to what I should expect from this back. I know this has happened to many of you from time to time. Do braced plates tend to return to their original shape with lower humidity, or do they tend to remain "deformed"? It's not a huge problem nor an expensive one either way. The back plate is locally obtained black walnut and I have plenty of it. I'm just curious about my chances of resurrecting this particular plate sometime in early winter. What experiences have you had in this kind of situation? Thanks to all. Patrick |
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| Author: | Glen H [ Tue Jun 26, 2012 12:56 pm ] |
| Post subject: | Re: Question about "potato chip" effect |
I had a back do the same a long time ago and since then have never braced a back until I'm ready to attach it to the sides. In other words, I don't leave a back braced longer than overnight before attaching to the sides. On a top, if it moves a little, you have the advantage of string tension to pull it back up and take out a little flattening that might have happened. With the back, you don't have that benefit. If you are using a go-bar deck you can put the back on the hollow dish and press it down with go-bars when you glue it to the sides. This will help re-form the arch a little. |
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| Author: | cphanna [ Tue Jun 26, 2012 3:59 pm ] |
| Post subject: | Re: Question about "potato chip" effect |
Thanks, Glen. Actually, I planned an immediate glue up as you suggested, but then got delayed a week and by then the humidity was quite a bit higher. But your idea about the radius dish is a good one. I'll try clamping the back in the radius dish. If it conforms to the dish, I'll just store it that way until I can glue it. If it doesn't conform, there's no reason I can't make another back next winter. Patrick |
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| Author: | Tony_in_NYC [ Tue Jun 26, 2012 8:58 pm ] |
| Post subject: | Re: Question about "potato chip" effect |
It should return to normal when the humidity returns to the level it was at when you braced it. |
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| Author: | cphanna [ Wed Jun 27, 2012 12:29 pm ] |
| Post subject: | Re: Question about "potato chip" effect |
Thanks, Tony, I suspected that was the case. I'm not on a schedule and have plenty of other things to do over the summer months, so I'll just wait and we'll see how it goes. Patrick |
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| Author: | Tony_in_NYC [ Wed Jun 27, 2012 5:11 pm ] |
| Post subject: | Question about "potato chip" effect |
Ain't no thang! |
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| Author: | WudWerkr [ Fri Jun 29, 2012 11:47 am ] |
| Post subject: | Re: Question about "potato chip" effect |
TONY !! In The Mando Section ??? He musssssssst be Lost ! Attachment: Cop.jpg No Goat pics here , please move along in an orderly fashion !
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