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| Builders and Repair Discussions for those with an interest in the construction and repair of mandolin family instruments. |
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#1 |
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Formerly: Summit33
Join Date: Nov 2007
Location: Lawrence, KS
Posts: 259
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My perfectionism maybe showing through here, but at lest I'm willing to admit it, and that's the first step right.
![]() Anyway...I guess I didn't get this joint as perfect as I thought I did before I glued it up. After rough carving it It seams as if the joint was better on the edges than the middle. I now have a hair-line seam between the pieces. It's cut to shape with a little play room and I have the outside arch carved, but NOT the inside. My question is: Should I try to heat the joint to seperate the seam and re-glue it? Or should I just leave it alone? The seam was glued together with regular tightbond. Anyone have experience doing this rework? Thanks in advance! |
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#2 |
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Registered User
Join Date: Nov 2003
Location: Virginia
Posts: 7,560
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Good pictures!
I believe I'd redo that one if there's enough wood. I would rip it apart, though, rather than trying to heat the glue joint, but I have a thin kerf blade. You might be able to heat it apart without too much warping, but I don't know. Did you start with wedge shaped pieces? If you were jointing and clamping wedge shaped pieces, that can lead to the joint opening on the angled (not the flat) side of the piece, and the joint will be loose in the center after carving. If you redo it with it already cut to shape, it will be even more difficult to get a good joint, so work carefully! This might be a good time to get some scrap wood, some hide glue, and learn to do rubbed joints before you do that back over. |
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#3 |
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Registered User
Join Date: Aug 2008
Posts: 32
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I agree with John, re do it.
If there is any doubt in your mind, re do it, and make a note of it so next time not to make that same mistake again. Its easy enough to fix now, much harder down the track. Best, Tony |
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#4 |
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Formerly: Summit33
Join Date: Nov 2007
Location: Lawrence, KS
Posts: 259
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Any suggestions on what to use to get them apart if I don't have a thin kerf blade?
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#5 |
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Registered User
Join Date: Nov 2003
Location: Virginia
Posts: 7,560
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How much wood do you have to spare? Do you have a good bandsaw that you can set up for a precise cut with a small blade?
If you have plenty of wood you can rip it with a table saw with a regular, not thin kerf, blade. Double stick tape or hot melt it to a piece of plywood or lumber so you can use the saw fence. You'll lose a little more than 1/8" doing it that way, and perhaps a little less than 1/8" with a good bandsaw. |
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#6 |
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Registered User
Join Date: Apr 2009
Location: Spring Branch, Texas
Posts: 374
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I too suggest recutting the joint. If the grain is reasonably straight and you have at least 0.25 inch margin, just take a heavy chisel and split along that joint. Then run both pieces through your jointer and reglue. Based on bitter experience, never attempt this type of fix with maple or walnut backboards, always saw them apart.
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#7 |
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Formerly: Summit33
Join Date: Nov 2007
Location: Lawrence, KS
Posts: 259
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Since this is a quilted maple board, you suggest that I saw it then? I don't have a table saw so I'll have to work slowly with my bandsaw. Wish me luck!
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#8 |
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Registered User
Join Date: Nov 2003
Location: Virginia
Posts: 7,560
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Use a fence on the bandsaw. All you need is a straight board clamped to the table and a board or piece of plywood with a straight edge to fasten the back to. Be sure the center seam is exactly parallel to the edge of your board and set your fence so that the blade tracks right down the center of your glue joint. After you've ripped the halves apart, then joint them again.
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#9 |
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Formerly: Summit33
Join Date: Nov 2007
Location: Lawrence, KS
Posts: 259
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John...Thanks for the tip about attaching it to a board first. It worked like a dream. I've got the seam apart and smoothed back up and it won't be too small. I still had some room (at lest a skosh or more). I think that i'll look a lot better this time.
Now I just got to work on that hide glue rubbed joint. Practice, practice practice.... |
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