Search found 195 matches

by Craig Bumgarner
Wed Aug 19, 2015 11:24 pm
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Lutz Top Tap test Results
Replies: 11
Views: 13235

Re: Lutz Top Tap test Results

I've been using Lutz from the same source on a half dozen guitars over the last year. I've tapped each set, but mostly just one half. I'd comment on the FRC shots if I could see them. I can't seem to bring the JPG up separately, how is that done?
by Craig Bumgarner
Wed Aug 19, 2015 10:00 pm
Forum: Instrument Builders Forum
Topic: Another wood ID?
Replies: 23
Views: 21231

Re: Another wood ID?

Looking at that back is making me dizzy :shock: Yeah, it is mesmerizing. If you look at it for a bit it takes on a 3D quality. Curly, I can see why you say it looks man-made, but taking a close look at it now, I don't think so, no evidence at all of glue lines which are readily seen in even modern ...
by Craig Bumgarner
Wed Aug 19, 2015 5:22 am
Forum: Instrument Builders Forum
Topic: Another wood ID?
Replies: 23
Views: 21231

Re: Another wood ID?

Another:
by Craig Bumgarner
Wed Aug 19, 2015 5:21 am
Forum: Instrument Builders Forum
Topic: Another wood ID?
Replies: 23
Views: 21231

Re: Another wood ID?

Another pic (yeah the side is cracked all the way across at the waist, crudely repaired, but solid)
by Craig Bumgarner
Wed Aug 19, 2015 5:19 am
Forum: Instrument Builders Forum
Topic: Another wood ID?
Replies: 23
Views: 21231

Another wood ID?

Anyone know what in the world this might be? The guitar is 70 years old, built in Paris. The rumor is it came from an Island in the Pacific Northeast, ala British Columbia (US East Coasters call this the Pacific Northwest) The finish on the back and sides are probably newer, no stain apparent. The b...
by Craig Bumgarner
Tue May 19, 2015 11:57 pm
Forum: Instrument Builders Forum
Topic: Hard shellac revisited
Replies: 19
Views: 17778

Re: Hard shellac revisited

Still interested if anyone has a comparison between U-Beaut and Royal Lac.
by Craig Bumgarner
Tue May 19, 2015 10:55 pm
Forum: Instrument Builders Forum
Topic: Hard shellac revisited
Replies: 19
Views: 17778

Re: Hard shellac revisited

Oh, I see. Of course. I just assumed that since we were talking shellacs, that you were talking about putting traditional shellac over the U-Beaut. Thanks for straightening me out.
by Craig Bumgarner
Tue May 19, 2015 1:12 am
Forum: Instrument Builders Forum
Topic: Hard shellac revisited
Replies: 19
Views: 17778

Re: Hard shellac revisited

I use it often and there is at least some on everything I build, but not necessarily as a top coat. Why is that? For me the only real fault with traditional shellac is that high humidity and perspiration seem to tear it up quickly. Royal Lac seems to be more resistant in this regard. I would think,...
by Craig Bumgarner
Mon May 18, 2015 9:52 pm
Forum: Instrument Builders Forum
Topic: Hard shellac revisited
Replies: 19
Views: 17778

Re: Hard shellac revisited

Not that cost is everything, but Royal Lac is half the price of U-Beaut Hard Shellac here in the US. $23 vs. $47.
by Craig Bumgarner
Mon May 18, 2015 9:27 pm
Forum: Instrument Builders Forum
Topic: Hard shellac revisited
Replies: 19
Views: 17778

Re: Hard shellac revisited

Thanks Martin. I figure it out and was in the process of editing when you posted the link. You guys seem to like U-Beaut. I've been using Royal Lac which I gather is similar but have not tried U-Beaut so don't really know. Royal Lac seems pretty good stuff, been using it in the standard French polis...
by Craig Bumgarner
Mon May 18, 2015 9:10 pm
Forum: Instrument Builders Forum
Topic: Hard shellac revisited
Replies: 19
Views: 17778

Re: Hard shellac revisited

Hard shellac is U-Beaut, yes? I've been using Royal Lac which I gather is a polymerizing shellac for about 9 months now. Is U-Beaut Hard Shellac the same?
by Craig Bumgarner
Sat May 09, 2015 4:38 am
Forum: Instrument Builders Forum
Topic: Torrefied wood
Replies: 22
Views: 25688

Re: Torrefied wood

Received the torrified sitka spruce top from Stewmac. Color is very nice, old looking. Color seems even all through. I'm no big expert on judging tops, but have been using the target thickness procedure from Trevor Gore's design book (4-60) for about a year now. This top compares well with the best ...
by Craig Bumgarner
Wed May 06, 2015 10:02 pm
Forum: Instrument Builders Forum
Topic: Torrefied wood
Replies: 22
Views: 25688

Re: Torrefied wood

I ordered one from Stewmac, I'll report back, should have it tomorrow.
by Craig Bumgarner
Tue May 05, 2015 11:26 pm
Forum: Instrument Builders Forum
Topic: Torrefied wood
Replies: 22
Views: 25688

Re: Torrefied wood

I think of the process as aging the wood, but this isn't the same as breaking in is it? I think of breaking in requiring vibration and playing. Still, the idea is interesting and I'll probably give it a try. They talk about the color and I wonder if that goes all the way through.
by Craig Bumgarner
Thu Apr 23, 2015 2:28 am
Forum: Instrument Builders Forum
Topic: Epoxy fill top before shellac?
Replies: 5
Views: 5432

Re: Epoxy fill top before shellac?

What kind of low spots? Small individual spots in the soft grain. Can't be more than a few hundredths of a millimeter. Probably dig out from initial heavier sanding and scraping. In spite of careful sanding with progressive grits to 1000, very hard to see until the first couple coats of shellac are...
by Craig Bumgarner
Wed Apr 22, 2015 10:44 pm
Forum: Instrument Builders Forum
Topic: Epoxy fill top before shellac?
Replies: 5
Views: 5432

Epoxy fill top before shellac?

Need a reality check. Would it be crazy to epoxy fill a spruce top before French polish? I'm using Lutz and this is my fifth guitar with it. Love it, but the soft grain is so soft that no matter the amount of sanding, I seem to end up with some low spots. If I start with shellac, it is a long road t...
by Craig Bumgarner
Tue Mar 17, 2015 6:57 am
Forum: Instrument Builders Forum
Topic: Binding Jig discussion
Replies: 29
Views: 25742

Re: Binding Jig discussion

It may be in the thread somewhere already, I just skimmed it, but wood works good for go-bars. I use oak. Mine are rectangular in section. Play around with a couple until you get the stiffness right. If they are too stiff, they are hard to bend in. If not stiff enough, they fall out as others are ad...
by Craig Bumgarner
Sat Mar 14, 2015 2:34 am
Forum: The Gallery
Topic: Corasón after Joseph DiMauro the elder
Replies: 10
Views: 11266

Re: Corasón after Joseph DiMauro the elder

Thanks! The finish is French polish with Royal Lac shellac. Epoxy filled the back and sides first. Maple is a closed grain wood, but the birdseye maple has lots of small grain pulls which would have made pumice filling tedious. Sealed the top with regular shellac, then mixed aniline dyes with Royal ...
by Craig Bumgarner
Thu Mar 12, 2015 11:53 pm
Forum: The Gallery
Topic: Corasón after Joseph DiMauro the elder
Replies: 10
Views: 11266

Re: Corazón after Joseph DiMauro the elder

My buddy from Uruguay says that regardless of how it is pronounced, it is spelled with a Z. Searches on the web turn up many more Corazón than Corasón, so I'm changing it now before getting it to deep. Now less an authority than Carlos Santana has a CD called Corazón and he pronounces it Chorus-zone...
by Craig Bumgarner
Thu Mar 12, 2015 11:11 pm
Forum: The Gallery
Topic: Corasón after Joseph DiMauro the elder
Replies: 10
Views: 11266

Re: Corasón after Joseph DiMauro the elder

I've seen it both ways. I'm told that in the Spanish version, the Z is pronounced "th", Corathon. I'm used to saying it with the S sound which I am told is the South American pronunciation and that spelling Corasón with an S implies this South American pronunciation. Course what do I know, I could b...
by Craig Bumgarner
Wed Mar 11, 2015 11:30 pm
Forum: The Gallery
Topic: Corasón after Joseph DiMauro the elder
Replies: 10
Views: 11266

Re: Corasón after Joseph DiMauro the elder

Thanks guys! I hope to have video next week some time. I'll post a link here when I do.
by Craig Bumgarner
Wed Mar 11, 2015 6:23 am
Forum: The Gallery
Topic: Corasón after Joseph DiMauro the elder
Replies: 10
Views: 11266

Corasón after Joseph DiMauro the elder

I don't put up much of my work here, but I've learned so much from reading this forum, I thought in appreciation I might post this, my new model Corasón, a replica of the elder Joseph DiMauro's manouche guitar with a heart shaped sound hole from the 1940s. More pictures and details here: https://cra...
by Craig Bumgarner
Thu Feb 19, 2015 4:20 am
Forum: Instrument Builders Forum
Topic: What to use to clearly mark dark brown wood???
Replies: 13
Views: 12871

Re: What to use to clearly mark dark brown wood???

I use welder's chalk, which I think is actually soapstone. Sharpens and removes easily.
by Craig Bumgarner
Tue Jan 20, 2015 8:58 am
Forum: Instrument Builders Forum
Topic: Dye questions
Replies: 6
Views: 7339

Re: Dye questions

I tried some ColorTone dyes in 1 pound cut shellac. Spray it with many thin coats. Coats dry immediately, I mean instantly, so I can just keep spraying. I stopped only because I wanted to adjust the hue a little, too yellow right now, but not dense enough yet, so plenty of room to adjust. Seems to w...
by Craig Bumgarner
Tue Jan 20, 2015 2:42 am
Forum: Instrument Builders Forum
Topic: Dye questions
Replies: 6
Views: 7339

Re: Dye questions

Peter, This is timely as I am trying to decide how to tint a guitar. Historically, I've done nothing more than use the finish itself to color the wood. In some cases, I have used amber shellac. But, now I have a project which requires a darker finish that resembles an aged vintage finish. Here is a ...