Search found 1048 matches

by Alan Carruth
Fri Feb 26, 2021 4:17 pm
Forum: Wood and Materials Q&A
Topic: Curly sitka spruce
Replies: 2
Views: 106

Re: Curly sitka spruce

Curl is recurrent run out. It reduces the long-grain Young's modulus because of the angle the fibers make to the axis of the piece. You probably should make the top a little thicker than usual, but it's hard to say how much unless you get a reading on the actual Young's modulus of the piece. There a...
by Alan Carruth
Wed Feb 24, 2021 3:55 pm
Forum: Flat-Top Acoustic Guitars and Bass Guitars
Topic: Rookie Bending Questions
Replies: 12
Views: 580

Re: Rookie Bending Questions

For some time I had problems using the bending blanket and form wit sides the broke in the upper bout. I'd bend the waist and the lower bout, and by that time the water was all gone off the upper bout, so I'd give it another spritz. The logic of doing it in that order was to give the usually tighter...
by Alan Carruth
Mon Feb 22, 2021 10:47 am
Forum: Wood and Materials Q&A
Topic: Bone direct from India?
Replies: 11
Views: 541

Re: Bone direct from India?

All the pet store stuff I've seen has been fat free, except for the ones that are filled with cheese or peanut butter, of course..... It's always a drag when I stop in at the pet store for some saddle stock and all they have is the filled bones.
by Alan Carruth
Mon Feb 22, 2021 10:45 am
Forum: Flat-Top Acoustic Guitars and Bass Guitars
Topic: Rookie Bending Questions
Replies: 12
Views: 580

Re: Rookie Bending Questions

One other thing: I usually start with the hardest (tightest) bend first. That way, if it breaks, you have not spent a lot of time on it. Usually that's the waist, or a cutaway; some Dreads have a sharper shoulder than the waist.
by Alan Carruth
Sun Feb 21, 2021 11:23 am
Forum: Wood and Materials Q&A
Topic: Bone direct from India?
Replies: 11
Views: 541

Re: Bone direct from India?

Fat in the bone will leach out into the wood and break it down over time. Dog bones from the pet store are typically steamed. I've processed bone at home, and it's generally harder than the pet store stuff. It's particularly handy if you heat with a wood stove. Assuming you've got a fresh bone from ...
by Alan Carruth
Sat Feb 20, 2021 2:54 pm
Forum: Flat-Top Acoustic Guitars and Bass Guitars
Topic: Rookie Bending Questions
Replies: 12
Views: 580

Re: Rookie Bending Questions

One trick I use is to over bend things initially: it's more important that the bend be smooth than that it be right. Allow the side to cool off, preferably over night, and then come back and un-bend as needed. The parts that bent too far to begin with will be easy to straighten out, but it's often h...
by Alan Carruth
Fri Feb 19, 2021 12:33 pm
Forum: Flat-Top Acoustic Guitars and Bass Guitars
Topic: Small bodied classical guitars
Replies: 3
Views: 295

Re: Small bodied classical guitars

Actually, it's easier to make a loud small guitar than a loud big one. As you reduce the span of the top you can make it thinner without losing the necessary stiffness. The mass of the top tends to drop faster than the area, and output depends on the ratio of A/m.Smaller instrument also tend to be m...
by Alan Carruth
Tue Feb 16, 2021 12:36 pm
Forum: Glues and Finishes
Topic: removing epoxied fretboard
Replies: 8
Views: 546

Re: removing epoxied fretboard

More or less. Epoxies can vary.
by Alan Carruth
Tue Feb 16, 2021 12:34 pm
Forum: Flat-Top Acoustic Guitars and Bass Guitars
Topic: Formica guit AR-7
Replies: 21
Views: 1455

Re: Formica guit AR-7

The redwood I've seen generally has the low damping of cedar with the density, Young's modulus, and surface hardness of spruce. It does have a tendency to split, though, for sure. It seems to be quite stable under humidity changes, like cedar, so it's more of an 'impact' issue than one of low humidi...
by Alan Carruth
Mon Feb 15, 2021 8:33 pm
Forum: Flat-Top Acoustic Guitars and Bass Guitars
Topic: Formica guit AR-7
Replies: 21
Views: 1455

Re: Formica guit AR-7

I've seen redwood like that. How was the tap tone?
by Alan Carruth
Mon Feb 15, 2021 11:02 am
Forum: Flat-Top Acoustic Guitars and Bass Guitars
Topic: Formica guit AR-7
Replies: 21
Views: 1455

Re: Formica guit AR-7

Redwood tends to have low surface energy; you need to be careful to always glue to a freshly worked surface. I made I allowed the the two halves of the first redwood top I made on class to sit for a week after planing the joint. We were using a gluing press, which was occupied with another top, and ...
by Alan Carruth
Sun Feb 07, 2021 11:17 am
Forum: Glues and Finishes
Topic: Oil-varnish finish repairability
Replies: 4
Views: 378

Re: Oil-varnish finish repairability

I've always brushed oil-resin varnishes. As with anything, it's a skill that takes a little time to acquire. I don't have a spray rig or a suitable space, so that's out anyway. Because of the way they cure, recoat times are very important with oil varnishes. Ideally you want to put the next coat on ...
by Alan Carruth
Sat Feb 06, 2021 6:55 pm
Forum: Glues and Finishes
Topic: Oil-varnish finish repairability
Replies: 4
Views: 378

Re: Oil-varnish finish repairability

'Varnish' is like 'wood'; it's the name of a class of materials that can differ a great deal from each other. That said, in general, it's harder to do repairs and touch-ups on oil varnish finishes than on things like shellac or regular nitro. Oil-resin varnishes harden through an oxidation reaction ...
by Alan Carruth
Sat Feb 06, 2021 6:43 pm
Forum: Flat-Top Acoustic Guitars and Bass Guitars
Topic: 12 fret 000 / 14 fret body shape
Replies: 7
Views: 511

Re: 12 fret 000 / 14 fret body shape

I've done 12-fret necks on the 14 fret OM shape, but I think that the longer box works better for that. You can do a 14 fret neck on the 12-fret body too. Just my opinion.
by Alan Carruth
Wed Jan 27, 2021 5:16 pm
Forum: Flat-Top Acoustic Guitars and Bass Guitars
Topic: Almost consistently bad glue joints...
Replies: 26
Views: 2287

Re: Almost consistently bad glue joints...

In the beginning I used Titebond for almost everything, and still use if for a number of joints that I think of as 'permanent', such as the back center join and cross grain reinforcement. It also has the advantage there due to a somewhat longer working time than HHG. I use hot hide glue for braces; ...
by Alan Carruth
Mon Jan 25, 2021 2:12 pm
Forum: Flat-Top Acoustic Guitars and Bass Guitars
Topic: Almost consistently bad glue joints...
Replies: 26
Views: 2287

Re: Almost consistently bad glue joints...

I was told several years ago that museum conservators start their day with a pair of anathemas; one on people who use wood screws to 'repair' antiques, and another on those who use Titebond and the ilk. The problems with Titebond are that it's not really soluble in water, and that nothing sticks to ...
by Alan Carruth
Fri Jan 22, 2021 10:57 am
Forum: Tools and Jigs
Topic: Thicknessing Binding.
Replies: 13
Views: 1000

Re: Thicknessing Binding.

I use T3 for gluing purfling and binding. Generally I glue the side line to the binding stock before cutting the strips, so the lines are bent along with the binding. I tape them together tightly with the side lines facing inward toward the middle of the assembly, so that they're supported, and this...
by Alan Carruth
Thu Jan 21, 2021 5:51 pm
Forum: Tools and Jigs
Topic: Thicknessing Binding.
Replies: 13
Views: 1000

Re: Thicknessing Binding.

I only use wood binding, and thickness it with a drill press planer, running the binding on a fence. This leaves a little to scrape off to get them smooth. I've also used that system to make 'no stick strips' from an old cutting board.
by Alan Carruth
Wed Jan 20, 2021 9:31 am
Forum: Tools and Jigs
Topic: Wow! Rulers Are Not the Same! Recommend An Accurate Straight-Edge?
Replies: 22
Views: 1756

Re: Wow! Rulers Are Not the Same! Recommend An Accurate Straight-Edge?

You can, of course, make a straight edge by planing or sanding a piece of wood or plexi. The trick is checking to see whether it's really straight or not, especially if you don't already have a straight edge. If you plane two pieces they could go together perfectly because they have mirror image cur...
by Alan Carruth
Sat Jan 16, 2021 5:40 pm
Forum: Flat-Top Acoustic Guitars and Bass Guitars
Topic: Hemlock tops
Replies: 6
Views: 636

Re: Hemlock tops

I did test out one piece of Eastern hemlock once. It was dense, and not very stiff along the grain for it's density. I would not be surprised if it made a 'quiet' guitar.