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| Back graft & go-bar woes http://www-.luthiersforum.com/forum/viewtopic.php?f=10102&t=11042 |
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| Author: | nathan c [ Wed Feb 21, 2007 1:05 pm ] |
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Just a slight rant and a simpmle question. I had a heck of a time trying to get the back graft to stay in place when trying to use the bars. I have to use a go-bar for this because I don't have clamps, cams or otherwise, to do this. I'm using LMI white glue and I tried my darnedest to wipe off the excess but as you can see in the pic I couldn't get close to the corner. Do any of you have similar problems? 
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| Author: | peterm [ Wed Feb 21, 2007 1:09 pm ] |
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I clamp a straight edge along the backgraft so I have a reference point. Then I apply the glue on the backgraft and lean it againg the edge and give it a few seconds until the glue starts to "grab" then I place the go bars carefully are use the edge as a guide. It works great! |
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| Author: | nathan c [ Wed Feb 21, 2007 1:11 pm ] |
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Doesn't the squeeze out glue the brace to the straight edge? Even if it is metal. |
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| Author: | peterm [ Wed Feb 21, 2007 1:18 pm ] |
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[QUOTE=nathan c] Doesn't the squeeze out glue the brace to the straight edge? Even if it is metal.[/QUOTE] Well, right after the go bars are in place I remove the straight edge....and clean it well! 
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| Author: | peterm [ Wed Feb 21, 2007 1:19 pm ] |
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One more thing, I place a strip of hard board on top on the backgraft so the go bars don't dent the soft spruce. |
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| Author: | nathan c [ Wed Feb 21, 2007 1:19 pm ] |
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Great idea Hesh. I like the radius idea. I could have done that with the clamps I have. Since the radius in the middle didn't need a clamp. |
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| Author: | nathan c [ Wed Feb 21, 2007 1:20 pm ] |
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Peter, not too worried about denting. I'm using hard maple. I posted a couple of months ago whether or not to use hard maple and the consensus was to go for it 
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| Author: | John How [ Wed Feb 21, 2007 1:27 pm ] |
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[QUOTE=nathan c] Doesn't the squeeze out glue the brace to the straight edge? Even if it is metal.[/QUOTE] Like Peter, I put is a stick right down the center next to where the back graft goes, clamoing it in with a couple goes sticks. Put in the graft using some short cawls to keep from nicking it up with the go bar stick and as soon as the glue grabs (just a couple minutes) I take the guide stick out and clean any squeezout. Everything is clean and perfectly aligned. |
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| Author: | peterm [ Wed Feb 21, 2007 2:01 pm ] |
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[QUOTE=John How] Put in the graft using some short cawls to keep from nicking it up with the go bar stick and as soon as the glue grabs (just a couple minutes) I take the guide stick out and clean any squeezout. Everything is clean and perfectly aligned.[/QUOTE] Johnny....thats exactly how I do it!
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| Author: | Dave White [ Wed Feb 21, 2007 6:57 pm ] |
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I use the low tech method - I use the brown tape I use for binding stretched across in 4 or 5 places and then one that goes the length stretched and secured on the top and back. Then when the glue is dry I scrape the grafy flush. |
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| Author: | Martin Turner [ Wed Feb 21, 2007 10:02 pm ] |
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[QUOTE=nathan c] Doesn't the squeeze out glue the brace to the straight edge? Even if it is metal.[/QUOTE] Waxpaper around the straight edge should prevent the glue sticking. |
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| Author: | Dave White [ Wed Feb 21, 2007 10:09 pm ] |
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Sorry - I was thinking about the tail wedge when I posted. But I still use brown tape and hhg. I put the back graft in as pieces after the bracing is in and carved. |
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| Author: | Dave Anderson [ Wed Feb 21, 2007 11:48 pm ] |
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[QUOTE=nathan c] I'm using LMI white glue and I tried my darnedest to wipe off the excess but as you can see in the pic I couldn't get close to the corner. Do any of you have similar problems? [/QUOTE]
I use my little 6" ruler to get the glue cleaned up close to the strip,then a damp cloth. 
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| Author: | Mattia Valente [ Thu Feb 22, 2007 1:18 am ] |
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I hate wax paper for preventing stickage; don't trust the lack of silicone, for one thing. Best stuff: clear packing tape. Apply to anything, and even superglue doesn't stick to most. |
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| Author: | Dave Rector [ Thu Feb 22, 2007 1:54 am ] |
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I do it the same as Peter and John do. Don't worry about the straightedge sticking, you have plenty of time to pull it out and clean it up. I also don't use anything protective on the top of the graft, since I plane it down and round it over after it is glued in. |
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| Author: | Dale R. Kirby [ Thu Feb 22, 2007 2:40 am ] |
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I have been using plastic bags from the big box stores for a glue barrier then scraping with a soft plastic scraper made for spreading spakling to clean the squeeze out. Seems to work good so far. I make sure the printing is on the side away from the glue. Don't ask how i learned this.  Kirby |
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| Author: | Chris Ide [ Thu Feb 22, 2007 2:59 am ] |
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I use a straight edge to position the graft, clamp it with no glue and run blue painters masking tape alone each side tight to graft, remove the bars and the graft apply glue and reclamp. The tape keeps the graft in place. After the glue tacks up remove the tape and clean up any squeeze, not much since the tape catches most of it. |
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| Author: | Chris Ide [ Thu Feb 22, 2007 2:59 am ] |
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I use a straight edge to position the graft, clamp it with no glue and run blue painters masking tape alone each side tight to graft, remove the bars and the graft apply glue and reclamp. The tape keeps the graft in place. After the glue tacks up remove the tape and clean up any squeeze out, not much since the tape catches most of it. |
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| Author: | nathan c [ Thu Feb 22, 2007 3:18 am ] |
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Thanks for all the responses! The remaining 2 pieces of the graft will definately be much easier to glue
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| Author: | Philip Perdue [ Thu Feb 22, 2007 4:07 am ] |
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Nathan, Try a straw to help with glue cleanup. Take a straw (McDonalds are strong) and cut a section of 3 or 4 inches off at a 45 degree angle. You can then run the point right along the glued joint to pick up excess glue. Philip |
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| Author: | Irwin R [ Thu Feb 22, 2007 4:49 am ] |
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Great idea Phillip!!...Kids..we're going out for supper Everyone grab a handful of straws and don't ask questions... |
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| Author: | peterm [ Thu Feb 22, 2007 12:47 pm ] |
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I would skip the straws and use a good ol' razor blade or a chisel...
but a big Mac would definitely help! 
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| Author: | Martin Turner [ Thu Feb 22, 2007 12:47 pm ] |
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[QUOTE=konacat] Nathan, Try a straw to help with glue cleanup. Take a straw (McDonalds are strong) and cut a section of 3 or 4 inches off at a 45 degree angle. You can then run the point right along the glued joint to pick up excess glue. Philip[/QUOTE] Not a bad idea....sucking up the glue with a straw. Titebond probably tastes about as bad as a Big Mac anyway
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