Search found 42 matches

by Richardl
Mon Apr 16, 2018 6:31 am
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Starting out on J45
Replies: 10
Views: 568

Re: Starting out on J45

Hi Trevor Thanks for your reply, that helps -I'll just have to take over a room in the house for a bit! I'm somewhat out of sequence in this build unfortunately as I still haven't sorted out a bending iron. I'll do it differently next time. The back and front will have to just sit around for a bit u...
by Richardl
Sun Apr 15, 2018 5:47 pm
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Starting out on J45
Replies: 10
Views: 568

Re: Starting out on J45 ...RH question

Hi - I've recently completed the soundboard, braced carefully at 45% RH (or a little below). It has been sitting at about 55% RH in the house for a day or two and has developed quite a convex curve (from the outside as shown in the book). I'm assuming that the rest of the glue-up will also need to b...
by Richardl
Thu Mar 29, 2018 8:21 am
Forum: Instrument Builders Forum
Topic: Soundboard gluing failure
Replies: 19
Views: 792

Re: Soundboard gluing failure

For the record, I contacted Titebond for info on the loss of strength likely when re-gluing. They very promptly replied with the following: "Testing being performed here shows when regluing joints, you could lose up to 15% of the strength, which is still very strong. When you have a glue in the 3500...
by Richardl
Wed Mar 28, 2018 7:01 pm
Forum: Instrument Builders Forum
Topic: Soundboard gluing failure
Replies: 19
Views: 792

Re: Soundboard gluing failure

Well, there seems to be a consensus to re-do it so that is what I have done. Actually, I've manged to cut and plane it with the loss of about 1 mm in width so the rosette looks fairly intentional and I can't tell it isn't a perfect circle by eye. I used a lot of glue and ensured plenty of squeeze-ou...
by Richardl
Tue Mar 27, 2018 3:47 pm
Forum: Instrument Builders Forum
Topic: Soundboard gluing failure
Replies: 19
Views: 792

Re: Soundboard gluing failure

Got home and tried an experiment. Cut off the top and bottom waste of the soundboard and bent the strips. The wood broke next to the join, not the glue line. The glue line is almost invisible but seems quite sound and a great deal stronger than the previous one that failed. Ive pushed and pummelled ...
by Richardl
Tue Mar 27, 2018 12:35 pm
Forum: Instrument Builders Forum
Topic: Soundboard gluing failure
Replies: 19
Views: 792

Re: Soundboard gluing failure

Thanks for that. Hadn't thought about using a scalpel rather than a saw! Should only loose a mm or so that way.

Cheers
Richard
by Richardl
Tue Mar 27, 2018 9:44 am
Forum: Instrument Builders Forum
Topic: Soundboard gluing failure
Replies: 19
Views: 792

Re: Soundboard gluing failure

Right, here is a plan. I can cut the board, plane and glue not worrying about the size and shape of the soundhole. Re-router out the centre hole to 104 mm and router out a 15 mm trench for this rosette so the rosette comes to the edge of the soundhole... http://www.lmii.com/products/mostly-wood/rose...
by Richardl
Tue Mar 27, 2018 7:57 am
Forum: Instrument Builders Forum
Topic: Soundboard gluing failure
Replies: 19
Views: 792

Re: Soundboard gluing failure

Unfortunately, it a patterned rosette, not just plain rings, so if its cut and re-joined it will look terrible. If the soundboard is cut, planed and re-glued, I'll end up with an elliptical hole and rosette anyway. I can router the hole circular OK, but will have to router out the rosette and find s...
by Richardl
Tue Mar 27, 2018 5:27 am
Forum: Instrument Builders Forum
Topic: Soundboard gluing failure
Replies: 19
Views: 792

Re: Soundboard gluing failure

Seems a shame to scrap it as its not easy to get the wood here in NZ. I'm not sure how to re-do the sound hole /rosette on the existing board as the dimensions will have changed after sawing it. Do you think the glue won't take to a previously glued surface? It actually looks fine now. When I bandsa...
by Richardl
Mon Mar 26, 2018 3:52 pm
Forum: Instrument Builders Forum
Topic: Soundboard gluing failure
Replies: 19
Views: 792

Re: Soundboard gluing failure

Right, well I bent the board a bit and heard a crack so the whole glue line failed with little effort and I have re-glued it from the back, forcing glue in the best I can without completely separating the halves (and not wiping the glue off with a damp cloth) ... and hopefully without wrecking the i...
by Richardl
Mon Mar 26, 2018 10:30 am
Forum: Instrument Builders Forum
Topic: Soundboard gluing failure
Replies: 19
Views: 792

Re: Soundboard gluing failure

Is a soundhole patch just reinforcement under the rosette?

Cheers
Richard
by Richardl
Mon Mar 26, 2018 6:21 am
Forum: Instrument Builders Forum
Topic: Soundboard gluing failure
Replies: 19
Views: 792

Re: Soundboard gluing failure

OK, thanks, I'll do that. I re-glued the cut out sound hole to test it and it has glued so well the wood failed not the glue line, so the titebond is fine. I didn't get much squeeze out so I must have just starved the joint. I was shocked how easily it broke though.

Cheers
Richard
by Richardl
Sun Mar 25, 2018 7:49 pm
Forum: Instrument Builders Forum
Topic: Soundboard gluing failure
Replies: 19
Views: 792

Re: Soundboard gluing failure

That was quick! Thanks. I also just had a thought that I could rout a 2 mm deep x 10 mm wide channel in the back centre of the soundboard - maybe just in areas there is less bracking and inlay a strip of spruce (either long or cross grain). Maybe that is overkill if the diamonds work just as well. B...
by Richardl
Sun Mar 25, 2018 7:24 pm
Forum: Instrument Builders Forum
Topic: Soundboard gluing failure
Replies: 19
Views: 792

Soundboard gluing failure

Hi All I've just inlayed my rosette and cut out a soundhole, picked up the board and the upper bout glueline cracked :cry: I've re-glued that and guess that is braced a good deal with the neck block etc so maybe it isnt a huge issue (and the glue line is covered) but I'm now worried that the rest of...
by Richardl
Sun Mar 04, 2018 7:46 am
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Starting out on J45
Replies: 10
Views: 568

Re: Starting out on J45

I guess I was just wondering whether the number of growth rings per cm had any influence on the likely failure of a brace and how I should choose the bit to use for the most critical braces as the number of growth rings can vary considerably. It seems maybe there isnt a clear relationship. Bought th...
by Richardl
Sun Feb 25, 2018 5:38 am
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Starting out on J45
Replies: 10
Views: 568

Re: Starting out on J45

Softwood species where the growth rings have a gradual transition from earlywood to latewood (e.g. the spruces and the firs). In these species growth of the denser latewood part of the growth ring is relatively constant irrespective of climate, whereas the earlywood part varies from year to year. Th...
by Richardl
Thu Feb 22, 2018 6:46 pm
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Starting out on J45
Replies: 10
Views: 568

Re: Starting out on J45

Just noticed the upper transverse brace in 7.3.5 says 10x20mm. I'm assuming that the plan is right and its 13 x 16mm, so maybe 15x20 stock. Or do I laminate 2 bits of 10x20? Does the number of growth rings or growth ring density have any impact on the build? It varies a lot between 2 or 23 upto 10+....
by Richardl
Thu Feb 22, 2018 5:23 am
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Starting out on J45
Replies: 10
Views: 568

Re: Starting out on J45

Many thanks Trevor. That is very helpful. I'm sure other things will crop up so its great that you are willing to offer advice here. I was a bit uncertain whether i should fork out for the books but i'm very glad I did and have learned a heap. Actually, I'm a trumpet player not a guitarist and am in...
by Richardl
Wed Feb 21, 2018 7:30 pm
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Starting out on J45
Replies: 10
Views: 568

Starting out on J45

Hi. Recently bought the excellent book (s) which I have been enjoying and have been busy making jigs and molds. I'm having a go at the J45. As a beginner, I have a couple of questions that i hope someone can answer (that probably show that I don't know what I'm doing)! The first thing I noticed is h...
by Richardl
Wed Sep 13, 2017 4:58 am
Forum: Instrument Builders Forum
Topic: Can someone please explain neck-body alignment to a newby?
Replies: 6
Views: 1320

Re: Can someone please explain neck-body alignment to a newby?

kiwigeo wrote:
Tue Sep 12, 2017 9:29 pm
Richardl wrote:
Tue Sep 12, 2017 8:08 pm
Maybe there is a book - or two with the method I should follow :wink:

Cheers
Richard
Two books..one black one white :mrgreen:
Yes, Ive contacted the bank to see if I can raise the mortgage :wink:
by Richardl
Tue Sep 12, 2017 8:08 pm
Forum: Instrument Builders Forum
Topic: Can someone please explain neck-body alignment to a newby?
Replies: 6
Views: 1320

Re: Can someone please explain neck-body alignment to a newby?

Firstly note that a 25' radius top will have greater curvature than a 33' not less Hi Jeff, thanks for your comments, yes I think I had understood that far. What I meant to say (I see it's a bit ambiguous) was the Kinkead method, I gather, used a flatter top, (I haven’t calculated it but is it a 50...
by Richardl
Mon Sep 11, 2017 3:50 pm
Forum: Instrument Builders Forum
Topic: Can someone please explain neck-body alignment to a newby?
Replies: 6
Views: 1320

Re: Can someone please explain neck-body alignment to a newby?

Thanks Trevor; yes your post from 3 years ago :) . I read it a few times before it really started to sink in so I'm glad I have more-or-less understood. The Kinkead soundboard curvature is less than seems to be typical (25'). Not sure if that has further disadvantages in strength and tone but wouldn...
by Richardl
Sun Sep 10, 2017 1:19 pm
Forum: Instrument Builders Forum
Topic: Can someone please explain neck-body alignment to a newby?
Replies: 6
Views: 1320

Can someone please explain neck-body alignment to a newby?

Hi Folks...sorry this might be a bit lengthy... I haven’t posted anything here for a while! Some years ago I made a guitar using the Kinkead book and got lots of helpful advice on this forum and from local luthiers http://www.anzlf.com/viewtopic.php?t=5517. The guitar I made had a flat top to keep i...
by Richardl
Mon Mar 17, 2014 6:20 am
Forum: Instrument Builders Forum
Topic: Wipe-on finish for acoustic guitar
Replies: 58
Views: 19133

Re: Wipe-on finish for acoustic guitar

Hi Kim well I'd never have thought of marbles! It sounds like a good idea and would have saved me throwing out numerous bottles of various finishes over the years. Thanks for the tip. I'm not sure about a fist full of instruments...its taken months just to make one (although there was probably more ...
by Richardl
Sun Mar 16, 2014 8:29 am
Forum: Instrument Builders Forum
Topic: Wipe-on finish for acoustic guitar
Replies: 58
Views: 19133

Re: Wipe-on finish for acoustic guitar

This looks like a reasonable buy. http://www.workshopinnovation.co.nz/pro ... 32&cat=120

1 litre should be enough!! :D

Cheers
Richard