Search found 132 matches

by Dennis Duross
Tue May 22, 2012 6:43 pm
Forum: Archtop Guitars and Bass Guitars
Topic: Deflection testing
Replies: 19
Views: 11570

Re: Deflection testing

Typo. My top deflects .06" under 40 lbs, not .04".
by Dennis Duross
Tue May 22, 2012 4:17 pm
Forum: Archtop Guitars and Bass Guitars
Topic: Deflection testing
Replies: 19
Views: 11570

Deflection testing

Anybody deflection test their finished tops under anything similar to string-tension downward force?

My top deflects .04 under 40 lbs of weight, with .625" high x .3125" wide x-braces (60 degree intersection of the braces).
by Dennis Duross
Tue May 15, 2012 6:49 am
Forum: Archtop Guitars and Bass Guitars
Topic: Steam bending Tops & Backs
Replies: 31
Views: 22929

Re: Steam bending Tops & Backs

Great info, Graham. I hope you do decide to contribute more in the future.
by Dennis Duross
Sun May 06, 2012 9:13 am
Forum: Archtop Guitars and Bass Guitars
Topic: Steam bending Tops & Backs
Replies: 31
Views: 22929

Re: Steam bending Tops & Backs

Thanks, Bob. Your success may help push me back in that direction. Notice I never did throw out the mold, and it would certainly be easy enough to lower the arch just by attaching some thin plywood all around the perimeter.
by Dennis Duross
Sat May 05, 2012 9:02 am
Forum: Archtop Guitars and Bass Guitars
Topic: Steam bending Tops & Backs
Replies: 31
Views: 22929

Re: Steam bending Tops & Backs

I was actually getting a pretty consistent .75" arch, but after seeing your process I'm guessing that the reason (given that my mold was so much higher than yours) was that my soundboards were not as thoroughly pliable as yours to begin with (your well-reasoned 20-minute spa treatment in the steam b...
by Dennis Duross
Thu May 03, 2012 7:11 pm
Forum: Archtop Guitars and Bass Guitars
Topic: Steam bending Tops & Backs
Replies: 31
Views: 22929

Re: Steam bending Tops & Backs

Here's a picture of the mold I made some time ago. It's made from 2 x 4's, and is 1.375" high under the bridge. Like I said earlier, I didn't have enough positive experiences with it to continue...
by Dennis Duross
Wed Apr 25, 2012 7:06 am
Forum: Archtop Guitars and Bass Guitars
Topic: Steam bending Tops & Backs
Replies: 31
Views: 22929

Re: Steam bending Tops & Backs

I've tried this before, but never got past the trial-and-error stage. Couldn't get what I felt were consistent results. Obviously you've worked out those problems and have ended up with a very nice guitar. Well done, old bean. It's no small feat. I hope you don't mind some questions? You must have a...
by Dennis Duross
Mon Feb 27, 2012 8:55 pm
Forum: Glues and Finishes
Topic: An art conservator's paper on the strength of hot vs liquid hide glues
Replies: 14
Views: 9042

Re: An art conservator's paper on the strength of hot vs liquid hide glues

I got ahold of William Patrick Edwards today, the maker of Old Brown Glue (OBG), and he very graciously responded to a number of questions. I'll present the entire text of our two emails below. His responses follow my questions (in red type). [Here's the first email exchange] Patrick: I’ve read thro...
by Dennis Duross
Mon Feb 27, 2012 8:22 am
Forum: Glues and Finishes
Topic: An art conservator's paper on the strength of hot vs liquid hide glues
Replies: 14
Views: 9042

Re: An art conservator's paper on the strength of hot vs liquid hide glues

I think it's (obviously) reasonable to expect that a test like this would be between two "fresh" products---but whereas fresh hot hide glue means just that, "fresh" liquid hide glue could mean just about anything short of the expiration date. One would assume the product would be a long way from its...
by Dennis Duross
Sun Feb 26, 2012 1:51 pm
Forum: Glues and Finishes
Topic: An art conservator's paper on the strength of hot vs liquid hide glues
Replies: 14
Views: 9042

Re: An art conservator's paper on the strength of hot vs liquid hide glues

All true. But even if newer formulations (since 1990) were weaker by half what they were in 1990 (which doesn't seem likely), they'd still be many times stronger than the forces applied by a 12-string guitar, wouldn't they? I mean, apply 1,200 PSI of force to a guitar and tell me how great it is tha...
by Dennis Duross
Sun Feb 26, 2012 10:12 am
Forum: Glues and Finishes
Topic: An art conservator's paper on the strength of hot vs liquid hide glues
Replies: 14
Views: 9042

An art conservator's paper on the strength of hot vs liquid hide glues

This morning I found a paper titled "A Study of The Properties of Commercial Liquid Hide Glue and Traditional Hot Hide Glue in Response to Changes in Relative Humidity and Temperature" at the following link: http://cool.conservation-us.org/coolaic/sg/wag/1990/WAG_90_buck.pdf If I read the paper's co...
by Dennis Duross
Mon Jan 30, 2012 9:55 pm
Forum: Wood and Materials Q&A
Topic: Arnt Rian's Norway Spruce processing
Replies: 15
Views: 9594

Re: Arnt Rian's Norway Spruce processing

So you don't have to paint the ends if you process the wood quickly? Do you just do that to the logs and the quartered wood if you can't get it all processed quickly?