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Re: Post a picture of what's on your bench?
In The Masters Bench, the book from the National Music Museum on the work of John D'Angelico, Jimmy D'Aquisto and Paul Gudelsky, there is a sketch by D'Aquisto of an idea for an Avant Garde model mandolin which was never made. Here is an in-progress of a mandolin inspired by that sketch and some of D'Aquisto's other design ideas. Spruce and maple with a burl walnut head overlay, an ebont fretboard and tortoise celluloid binding.
Attachment 193391
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Re: Post a picture of what's on your bench?
Graham: who is building that mandolin?
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Re: Post a picture of what's on your bench?
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Re: Post a picture of what's on your bench?
Very avant garde design, Graham, and beautifully executed by you.
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Re: Post a picture of what's on your bench?
Quote:
Originally Posted by
Graham McDonald
...a sketch by D'Aquisto of an idea for an Avant Garde model mandolin...
Something about the design/aesthetic sense of Jimmy DaQuisto has always made an impression on me. I've looked a photos of his work and been impressed, but I've also stood and looked at his actual guitars. Great lines and contours, deceivingly simple shapes that convey complex ideas...
Sometimes the longer I look the more I see; things that I probably would have missed if I wasn't a builder myself. He was a luthier's luthier. I too have drawn inspiration from the work of Jimmy D'Auisto.
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Re: Post a picture of what's on your bench?
Graham: Very cool!
The old sketch story is interesting. I've been through that collection in the NMM and never saw that one. I always laughed when I first saw the two point pattern in the MET collection that has Paul Simon's old phone number penciled in on the side.
I remember being a young kid and calling up Jimmy on the telephone to chat about guitars.....
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Re: Post a picture of what's on your bench?
Hey you Mando Nerds . . . Back to what's on the bench now!
Attachment 193402
Steve
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Re: Post a picture of what's on your bench?
'Love that design Steve.
Every time I look at it, I try to pinpoint the inspiration: 1940 Packard? The Cadillac for that period and Auburn are also close. Car nerding is a nice break from mandolin nerding....
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Re: Post a picture of what's on your bench?
1930s Pontiacs were the starting place, but she quickly became her own woman.
Steve
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Re: Post a picture of what's on your bench?
I was making room in my basement for a new planer and found a box from when we moved here in 2009. Inside was a flamed maple back. I joined it before the move but didn't use it because I was worried that the hide glue mix was too thick. I remember using the recipe the can had printed on it. I was thinking it was thicker than I thought it should be. I called the company and found out the instructions were printed wrong. Way too much hide glue to water. I am now wondering if I should take a chance with using it. I seem to remember hide glue that is too thick can be brittle. What would you do? Attachment 193410Attachment 193411Attachment 193412
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Re: Post a picture of what's on your bench?
If I was the least bit unsure about the integrity of the joint I would rip it out and do it over.
How does the joint look? Can you easily see a glue line? Did you try taking a plane shaving across the joint and try breaking it at the joint? All of those are ways to evaluate the joint and it might be fine as is.
Here is a shaving that I kept because it shows the glue joint. I was "hogging" maple with a gauge after drilling guide holes. Using a gouge means no chip breaker, and we can cut as deep as we have strength to cut. The glue joint held up fine. If you can do this your joint should hold up fine.
Attachment 193413
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Re: Post a picture of what's on your bench?
I have sharp gouges and will give this a try tomorrow. It was my first attempt at a rubbed joint and that along with the mix issue made me wary. The joint looks good to me and there is no noticeable glue line. Looking at the grain is the only way I can see the actual joint.
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Re: Post a picture of what's on your bench?
Quote:
Originally Posted by
John Bertotti
I was making room in my basement for a new planer and found a box from when we moved here in 2009. Inside was a flamed maple back. I joined it before the move but didn't use it because I was worried that the hide glue mix was too thick. I remember using the recipe the can had printed on it. I was thinking it was thicker than I thought it should be. I called the company and found out the instructions were printed wrong. Way too much hide glue to water. I am now wondering if I should take a chance with using it. I seem to remember hide glue that is too thick can be brittle. What would you do?
Were the glue too thick it would gel prematurely and you probably wouldn't be able to clamp it without visible glue line and rubbed joint would also be hard to do. As John says if the joint is invisible (no glue line) and you are sure there was enough glue in the joint it is most likely good. On maple slpitting the joint on cutoff will often break at the glue line but if the force required was high and you can see tiny fibers torn it is OK.
BTW, what was the wrong recipe? And what brand (and bloom strength) of glue?
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Re: Post a picture of what's on your bench?
Thanks! It was a can of Behlen Master Dry Ground Hide Glue, the can called for equal parts of dry ground to water. I vaguely remember adding more water to get a consistency I thought was more appropriate but it was early in my hide glue days and I was second-guessing myself after mixing it. I did contact them and was told those instructions were wrong and it should have read 1 part dry ground to 1.9 parts water. I know I used more water than the can said but had no idea if I used as much as 1.9 to 1. I was probably closer to 1.5 to 1 but it was 12+ years ago so I can not say with full certainty. I did make a 10 string out of it as well that played great but got ruined when my 1-year-old decided to let it sit in the tub with the water running. The top and back separated from the soaking at the tail block for about 2 inches from the rim. Warped discolored and I have not had the desire to ever fix it. It just sits on the stand reminding me of the need to keep toddlers away from builds and to drill my tuner holes by hand, the little drill press I had had too much run-out so the holes were not perfectly aligned. That alone drives me nuts. I don't know if an almost 2-1 mix would have been too thin or correct but what I mixed to at the time was nowhere near as thick as honey and the 1-1 mix was very close to honey to the consistency of honey to start with. Thanks!
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Re: Post a picture of what's on your bench?
That sounds like it was 190gram strength glue. The higher strength glues require more water. It's easier to err on side of making the glue too thin and get starved joint especially on curly maple. It looks like good tight jont but it is weak because most of glue got absorbed by the wood, especially if the wood was warmed. If you apply thicker glue you risk quick gelling and/or thick visible glue line but hardly a starved joint.
BTW, I don't weigh glue anymore. I've been working with the same glue for 2 decades and some of the water evaporates anyway so you sometimes have to add unknown amount and only can judge the viscosity as it pours off the brush...
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The can doesn't actually say what gram strength it is. And having no clue as to what the viscosity should be I shot for less than honey. I have no idea if that was correct. It was about 100F in the area I was working that day. I remember it being quite hot.
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I used a very small hand plane and got a shaving off. I couldn't find the joint and when I tried to break it, there was no way it broke along a glue joint more like it followed the natural grain of the wood. I am more than pleased with this outcome thanks for the help!
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Re: Post a picture of what's on your bench?
Well. I think Ive been doing it right. Tested the product for dry time and strength. I guess patients is key. I am working on a trapeze tailpiece that belongs to a 1911 Gibson style U.
Started as.
Attachment 193440
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Then to a mold from the original.
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Made a sample piece. Checking for strength and what dyes to use.
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Then onto making the actual piece
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Then to this.
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I think it might work.
Let me know what you think. Thanks for looking.
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Re: Post a picture of what's on your bench?
OK, personally I would add a few layers of woven fiberglass in the middle of the pour. It will be invisible, but will keep it from failing catastrophically, which could be dangerous. The metal does most of the work, but... I don't know, I've seen how pure epoxy/resin fails on impact, and it can be un-pretty. But if you're done, I guess just give it a shot and see what happens. I'd wait a good week before stringing it up, these things take time to cure fully.
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Re: Post a picture of what's on your bench?
#8-18 sitting on the bench. 11 at once is quite the undertaking, not sure I’ll build that many at the same time again.
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Re: Post a picture of what's on your bench?
Quote:
Originally Posted by
Marty Jacobson
OK, personally I would add a few layers of woven fiberglass in the middle of the pour. It will be invisible, but will keep it from failing catastrophically, which could be dangerous. The metal does most of the work, but... I don't know, I've seen how pure epoxy/resin fails on impact, and it can be un-pretty. But if you're done, I guess just give it a shot and see what happens. I'd wait a good week before stringing it up, these things take time to cure fully.
Thank you for the info actually a good idea. Im in no rush to get this done. I have no problem in re doing this either. What ever makes it safe and functional. The original was just celluloid with no weeving in the mix. I have plenty of products for different types of load tests. I just Wish I had more tailpieces for trial and error. Im sure theres a few out there from non repairable harp guitars.
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11 Mandolins at once?! I hope you keep good track of who's on what step!
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Re: Post a picture of what's on your bench?
Quote:
Originally Posted by
Reywas
11 Mandolins at once?! I hope you keep good track of who's on what step!
Back in my #8 through #18 days I would have had 11 multiples of several mistakes.
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Re: Post a picture of what's on your bench?
Quote:
Originally Posted by
Jacob Hagerty
#8-18 sitting on the bench. 11 at once is quite the undertaking, not sure I’ll build that many at the same time again.
Dont mind me asking. What kind of a time frame to just get one finished? Thats quite a undertaking with whats on your bench. Nice.
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Re: Post a picture of what's on your bench?
a teardrop, Sitka spruce and bigleaf maple, leather case padded and lined, still have to fit the bridge
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