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| Indentations and hollows in the sides http://www.luthiersforum.com/forum/viewtopic.php?f=10101&t=21047 |
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| Author: | Mike OMelia [ Sun Feb 15, 2009 3:06 am ] |
| Post subject: | Indentations and hollows in the sides |
On my harp project, every piece of would was hand cut, sanded, thicknessed, and bent by hand. No kit parts. After assembling the box and doing some scraping and sanding, I noticed shallow hollows and indentations. Given the hardness of the wood, they were a real pain to "flatten". Is this normal? I have heard of people using chalk to find them. Are there ways to minimize this? (maximize flattnes and uniformity.) Or is this a normal process in guitar building? Mike |
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| Author: | Kim [ Sun Feb 15, 2009 3:41 am ] |
| Post subject: | Re: Indentations and hollows in the sides |
Mike O'Melia wrote: Are there ways to minimize this? (maximize flattnes and uniformity.) Or is this a normal process in guitar building? Mike Use a drum sander to bring the material down to working thickness, and don't use too much water when bending the sides. Cheers Kim |
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| Author: | Hesh [ Sun Feb 15, 2009 7:44 am ] |
| Post subject: | Re: Indentations and hollows in the sides |
Yeah it happens and the worst that I have ever experienced was with African "rope" mahogany where the ripples appeared where the "rope" figure was. Mahogany seems to benefit from being very stingy with the spritzing of water prior to bending. Block sanding the sides is just part of building and is usually necessary to varying degrees with any guitar that I build. Just make pencil lines across the sides and sand with a flat block preferably longer then the side is wide until the lines are gone and you are good to go. |
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| Author: | bluescreek [ Sun Feb 15, 2009 9:00 am ] |
| Post subject: | Re: Indentations and hollows in the sides |
Wood is not perfect all the way across its face and as you can see , soft spots will react differently than harder areas. It doesn't happen all the time but yes it can happen. The wider the graining the more you can expect this to happen. john hall |
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| Author: | Mike Collins [ Sun Feb 15, 2009 4:29 pm ] |
| Post subject: | Re: Indentations and hollows in the sides |
Anisotropic is what this is called. Not having the same properties in all directions. I find the thickeness of the sides has an affect on this. Thicker sides develop it more easily then thin sides-thin sides flatten as you bend them (a bit ) compared to thick sides. The cut of the wood matters also ! Slab,quartered,rift , Mike |
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| Author: | Mike OMelia [ Sun Feb 15, 2009 7:57 pm ] |
| Post subject: | Re: Indentations and hollows in the sides |
So, what I am hearing is that it is a part of the process. Roger that. Mike |
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| Author: | Hesh [ Sun Feb 15, 2009 8:00 pm ] |
| Post subject: | Re: Indentations and hollows in the sides |
Mike O'Melia wrote: So, what I am hearing is that it is a part of the process. Roger that. Mike Exactly! If the sides were not flat, pores did not stay filled, binding channels were not even, neck/body joints had gaps - anyone could do this........  We are all insane I tell ya!!!  ![[headinwall]](./images/smilies/headbangwalluf8.gif "Mad") 
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| Author: | Mike OMelia [ Sun Feb 15, 2009 10:18 pm ] |
| Post subject: | Re: Indentations and hollows in the sides |
Thats good to know. Maybe I will build a steam box. (or get one) Mike |
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