I use a single bolt on ukuleles but the forces are greater with six steel strings. I use a furniture-bolt with a tee-nut on the inside. I have considered using a dowel-pin in addition on my next project, a mandolin.
Bob
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| One neck bolt for Thinline acoustic?? http://luthiersforum.com/forum/viewtopic.php?f=10101&t=43446 |
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| Author: | Duhjoker [ Tue May 13, 2014 9:15 pm ] |
| Post subject: | One neck bolt for Thinline acoustic?? |
I've been building Thinline acoustics for a while now and I have a question about neck bolts. Been looking at other guitars and noticed some bolt on necks are only using one bolt and brass insert. So my question is do I really need to use both bolts and brass inserts for a Thinline bolt on neck? It would sure make things easier. |
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| Author: | Dave Livermore [ Tue May 13, 2014 9:30 pm ] |
| Post subject: | Re: One neck bolt for Thinline acoustic?? |
Am curious too. With a shorter heel and thus shorter tenon, you may only be able to get one bolt in there. It should be fine. However, I recommend some cross grain wood for the threads of the insert to bite into. And a test run. It shouldn't take more than a few minutes to make a mock tenon from some scrap wood, pop an insert in there and see what kind of force it will take via cranking down on the screw to see what gives first. D |
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| Author: | Duhjoker [ Tue May 13, 2014 10:01 pm ] |
| Post subject: | Re: One neck bolt for Thinline acoustic?? |
Yea I make all my blocks. It's just simpler that way to me. I have been using both bolts but I have to chisel away some of my UTB's in the middle and cap them in order to get the bolts in and out and be able to use a tool. One bolt sure would make that easier. Thanks for the info that really helped. |
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| Author: | unkabob [ Tue May 13, 2014 11:20 pm ] |
| Post subject: | Re: One neck bolt for Thinline acoustic?? |
I use a single bolt on ukuleles but the forces are greater with six steel strings. I use a furniture-bolt with a tee-nut on the inside. I have considered using a dowel-pin in addition on my next project, a mandolin. Bob
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| Author: | Colin North [ Wed May 14, 2014 9:05 am ] |
| Post subject: | Re: One neck bolt for Thinline acoustic?? |
Keep the tenon, and mortice a 3/8" brass or steel bar vertically into the heel. Thread a hole in it to line up with a single 6 mm mounting bolt. Try a mock up and test that, you'll have a hard time pulling anything out of place before your wrist gives out. |
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| Author: | Duhjoker [ Wed May 14, 2014 7:07 pm ] |
| Post subject: | Re: One neck bolt for Thinline acoustic?? |
Ok I had an idea. I don't have a fancy CAD program like a lot of people sorry. I do things the old fashioned way. Any way take a neck and look at it from the side. The headstock to the left and the heel to the right. Now imagine that is all slotted and fit together and you can see through the neck block. All right so add the strings. That's automatically gonna pull the neck forward toward the body. Right. We know this. So what if I put the bolt lower than dead center on the tenon? By maybe a quarter inch. Wouldn't that relieve the tension better and allow it to balance out? Do you get what I'm saying? |
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| Author: | DennisK [ Wed May 14, 2014 7:50 pm ] |
| Post subject: | Re: One neck bolt for Thinline acoustic?? |
Yep, the lower you can get it, the better. I see no reason two bolts should be necessary. The bottom one is in tension, and the sides and fingerboard->soundboard glue joint support the compression force at the upper end. The upper bolt is just kinda sitting there doing nothing. Look at violins. The tension force is taken by the continuous grain of the back "button" that the heel glues to. Your bolt is taking the place of the button in that situation. Lower = more leverage. And if you're not already sticking a dowel down vertically through the heel, do that, so you have some continuous grain between your bolt and the pivot point that it's levering against. Plus better grain for the threaded insert to bite into. |
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| Author: | Duhjoker [ Wed May 14, 2014 8:51 pm ] |
| Post subject: | Re: One neck bolt for Thinline acoustic?? |
Excellent thank you!!!!!! Would you mind posting a pic about the dowel bit. ID like to see exactly what you mean. And thank you again. |
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| Author: | RustySP [ Wed May 14, 2014 9:15 pm ] |
| Post subject: | Re: One neck bolt for Thinline acoustic?? |
You axed me to text you. Sent from my iPhone using Tapatalk 2 |
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| Author: | RustySP [ Wed May 14, 2014 9:18 pm ] |
| Post subject: | Re: One neck bolt for Thinline acoustic?? |
Oops sorry, trying to read posts and text messages. Sent from my iPhone using Tapatalk 2 |
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| Author: | DennisK [ Wed May 14, 2014 9:22 pm ] |
| Post subject: | Re: One neck bolt for Thinline acoustic?? |
This thread has good pictures: http://www.luthiercom.org/phpbb3/viewtopic.php?f=89&t=1834 EDIT: Now that I think about it, the dowel's probably not necessary for a thinline since the heel is so short anyway. But still not a bad idea since it gives the insert better grain to bite. |
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| Author: | Duhjoker [ Wed May 14, 2014 9:51 pm ] |
| Post subject: | Re: One neck bolt for Thinline acoustic?? |
Cool thank you I get it now. |
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