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 Post subject: Coffee Bag Micarta
PostPosted: Fri Sep 03, 2021 8:24 am 
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Brazilian Rosewood
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This stuff is really cool. I'm building one of my folk art barn wood parlor guitars for a guy now who had a cool vision for aesthetics. It's a burlap composite made from the burlap coffee bags and epoxy resin. He wanted it used as a rosette and for the head plate veneer. Apparently it's real popular for the knife makers who like it for handles. But I think it's going to look great on the guitar. Just thought I'd share.

Here's where I got the stuff: https://www.shadetreecustom.com/shop

It comes in a sheet that's like 12x18 inches or so. I cut that in half and it thinned out nicely in my drum sander.

Image

You can see the burlap and it almost looks like marquetry. The burlap even had inked lettering on it from the original bags.

Image



These users thanked the author jfmckenna for the post: Michaeldc (Fri Sep 03, 2021 8:32 am)
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 Post subject: Re: Coffee Bag Micarta
PostPosted: Fri Sep 03, 2021 9:45 am 
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Interesting to say the least. Post pix of the peghead veneer when you're done.

I bookmarked the website. I like the ruby pattern.
Work for a pickguard, maybe? I see they have scraps for sale...

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 Post subject: Re: Coffee Bag Micarta
PostPosted: Fri Sep 03, 2021 9:48 am 
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Wow, cool! Why does the color change?

Pat

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 Post subject: Re: Coffee Bag Micarta
PostPosted: Fri Sep 03, 2021 10:46 am 
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Very cool! I like the look. Is the surface of the material flat from the epoxy or is it textured?

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 Post subject: Re: Coffee Bag Micarta
PostPosted: Fri Sep 03, 2021 11:00 am 
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Cocobolo
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That looks pretty cool. But....

Pmaj7 wrote:
Wow, cool! Why does the color change?

Pat


Looks blue in the first pics, then darkish brown installed.
What did you do?


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 Post subject: Re: Coffee Bag Micarta
PostPosted: Fri Sep 03, 2021 11:28 am 
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THAT is really nice, tasty.
I would imagine many similar things could be shop made made from jeans, gauze, steel scrubbing pads and other materials - maybe even find a use for old Xmas jumpers.

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The name catgut is confusing. There are two explanations for the mix up.

Catgut is an abbreviation of the word cattle gut. Gut strings are made from sheep or goat intestines, in the past even from horse, mule or donkey intestines.

Otherwise it could be from the word kitgut or kitstring. Kit meant fiddle, not kitten.


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 Post subject: Re: Coffee Bag Micarta
PostPosted: Fri Sep 03, 2021 11:37 am 
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Brazilian Rosewood
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I'll definitely take pics of the headstock when it's done.

The color in the first pic is that way right off the drum sander. When it's inlayed there is a Naptha swipe over it which picked up a lot of the dust and makes it look like what it will look like under the finish. So that is more representative of the true color. You can really see the burlap grain texture in it but it is dead flat. The epoxy just soaks the whole thing up. so it's almost like taking the burlap and sandwiching it between two pieces of glass.


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 Post subject: Re: Coffee Bag Micarta
PostPosted: Fri Sep 03, 2021 12:28 pm 
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Location: Clayton, NY
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I've got quite a few jute coffee bags - I happen to run a coffee roastery, too. I'll have to experiment!


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 Post subject: Re: Coffee Bag Micarta
PostPosted: Fri Sep 03, 2021 3:20 pm 
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Brazilian Rosewood
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Interesting…


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 Post subject: Re: Coffee Bag Micarta
PostPosted: Fri Sep 03, 2021 3:48 pm 
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Very interesting. I should have used some of that on my Harmony Sauvignon, that I re-topped with wine crate panels.
I like the barn wood that you used.


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These users thanked the author guitarjtb for the post (total 2): bcombs510 (Fri Sep 03, 2021 6:09 pm) • TimAllen (Fri Sep 03, 2021 3:52 pm)
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 Post subject: Re: Coffee Bag Micarta
PostPosted: Fri Sep 03, 2021 5:35 pm 
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Brazilian Rosewood
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James! I freakin' love that. Fantastic!!!


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 Post subject: Re: Coffee Bag Micarta
PostPosted: Fri Sep 03, 2021 5:37 pm 
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Brazilian Rosewood
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Chris, I don't see why it would not work for a pick guard. I have not tried to thin it that much but it does seem to be rather homogeneous.



These users thanked the author jfmckenna for the post: Bryan Bear (Fri Sep 03, 2021 8:22 pm)
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 Post subject: Re: Coffee Bag Micarta
PostPosted: Fri Sep 03, 2021 8:10 pm 
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Well, it's essentially a phenolic material. I made plenty of airplane parts and tooling from that nasty old brown stuff made of canvas and resin. Smells horrible when cutting or sanding, but it's nearly indestructible and is unaffected by water or other liquids. I seem to remember Luthiers Mercantile making some high quality black phenolic material for nuts from linen and resin that worked really well. There's no reason this stuff shouldn't work for parts or tools, and it looks nicer to boot. It has promise in my estimation.

It just struck me - pickup rings. Should be dandy. Can be flat or arched, obviously easy to route, drill, and shape. Would look better than injection molded plastic and won't crack or dry out like wood. Bet it will take a finish, too - lacquer, TruOil, shellac, what have you.

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 Post subject: Re: Coffee Bag Micarta
PostPosted: Fri Sep 03, 2021 8:58 pm 
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Brazilian Rosewood
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J. F. ,
Since you are getting into working with epoxy resin you could mold a back and side set out of a pair of Levi's to go with the rosette on the Barn Wood guitar. bliss


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 Post subject: Re: Coffee Bag Micarta
PostPosted: Fri Sep 03, 2021 11:13 pm 
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Grippy, not slippy!

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 Post subject: Re: Coffee Bag Micarta
PostPosted: Sat Sep 04, 2021 9:12 am 
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Brazilian Rosewood
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LOL I like the idea but I did not make that coffee bag sheet. I purchased it.

I think it would definitely work well for pickup rings too. I glued the rosette in with CA but I plan on using epoxy for the head plate veneer. seems to be the right choice to me. I suppose CA would work ok there too.


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 Post subject: Re: Coffee Bag Micarta
PostPosted: Sat Sep 04, 2021 10:06 am 
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Brazilian Rosewood
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jfmckenna wrote:
LOL I like the idea but I did not make that coffee bag sheet. I purchased it.

I think it would definitely work well for pickup rings too. I glued the rosette in with CA but I plan on using epoxy for the head plate veneer. seems to be the right choice to me. I suppose CA would work ok there too.


In one of my boatbuilding books there was a builder who used cloth in place of glass fibre as a layer in a layup of a small dingy. The cloth provided the color and pattern to the outside surface of the boat. I thought it was an interesting idea.



These users thanked the author Clay S. for the post: jfmckenna (Sat Sep 04, 2021 10:30 am)
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 Post subject: Re: Coffee Bag Micarta
PostPosted: Sat Sep 04, 2021 12:30 pm 
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I emailed the owner and a box of scrap is already on its way to my door.

Also, it occurred to me that some name makers have been using high quality phenolic composites for fingerboards.... Gibson uses Richlite (layers of recycled paper in resin) on several upper end guitars. One of my long time clients owns a nice ES-275 with a Richlite board. It looks great, and he has no complaints.

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 Post subject: Re: Coffee Bag Micarta
PostPosted: Sun Sep 05, 2021 2:11 pm 
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Brazilian Rosewood
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Cool! Post up some pics of what ever you make out of the scraps.


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 Post subject: Re: Coffee Bag Micarta
PostPosted: Sat Sep 11, 2021 3:04 pm 
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My box of scraps arrived yesterday - quite the variety of colors and surfaces. Filled that little box to the max - it was heavy. Out to the shop!

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 Post subject: Re: Coffee Bag Micarta
PostPosted: Sat Nov 13, 2021 4:46 pm 
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Brazilian Rosewood
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Follow Up:

Here is what it looks like under some French Polish shellac. The pics don't really give it the depth but it's perfectly flat and has a lot of dimensions to it. Pretty neat stuff in particular for this oak barn wood folk art parlor guitar.

Image

Image

Image



These users thanked the author jfmckenna for the post (total 6): Ernie Kleinman (Tue Nov 16, 2021 11:01 am) • DannyV (Mon Nov 15, 2021 1:11 pm) • joshnothing (Sun Nov 14, 2021 5:36 am) • Chris Pile (Sat Nov 13, 2021 6:21 pm) • J De Rocher (Sat Nov 13, 2021 4:53 pm) • Michaeldc (Sat Nov 13, 2021 4:52 pm)
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 Post subject: Re: Coffee Bag Micarta
PostPosted: Sat Nov 13, 2021 5:31 pm 
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Brazilian Rosewood
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I wonder how well it would hold frets.


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 Post subject: Re: Coffee Bag Micarta
PostPosted: Sat Nov 13, 2021 5:50 pm 
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Brazilian Rosewood
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Clay S. wrote:
I wonder how well it would hold frets.


I can do an experiment with that. My guess is that it will hold them just fine especially if you use CA or probably even HHG to hold them in


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 Post subject: Re: Coffee Bag Micarta
PostPosted: Sat Nov 13, 2021 6:21 pm 
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Agreed - glue them in.

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 Post subject: Re: Coffee Bag Micarta
PostPosted: Sat Nov 13, 2021 8:48 pm 
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That's really cool, nice work!

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