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Mat Roop Senior Member
Joined: 24 Mar 2007 Posts: 911 Location: Wyoming Ontario
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Posted: Tue Mar 27, 2007 11:35 pm Post subject: Broken tip |
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I have a bow with a split tip. I glued it back with fresh hide glue, but when I tried to cut a slit for a reinforcing spline, the tip broke off again. Is it hard to glue brazilwood, or would you suspect it had been tried to be glued with carpenters glue... although I did not notice any residue.
Thanks for any advice!
Mat |
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Leif Luscombe Site Admin
Joined: 19 Mar 2007 Posts: 126 Location: Mount Elgin, Ontario, Canada
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Posted: Wed Mar 28, 2007 7:36 am Post subject: |
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Hi Mat,
The best glue to uise on Pernambucco/Brazilwood is cyanoacrylate (Krazy Glue for wood). Hide glue won't work. _________________ Leif Luscombe
Violin Maker and Dealer
The Violin Forum Moderator |
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Mat Roop Senior Member
Joined: 24 Mar 2007 Posts: 911 Location: Wyoming Ontario
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Posted: Wed Mar 28, 2007 7:24 pm Post subject: |
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Thats what I suspected... is it the waxy/oily nauture of the wood or the density?... although hide glue sticks to glass, so, the porosity and density should not be an issue...
Thanks, Mat |
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DonLeister Moderator
Joined: 29 Mar 2007 Posts: 383 Location: Richmond, VA
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Posted: Mon Apr 16, 2007 5:17 pm Post subject: |
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Mat,
Lynn Hannings recommends Aaron Alpha brand industrial crazy glue which she sells also or you can get it from Wassco online. I forget exactly if its the 201 or 101, 201 I think. It's thinner than water and wicks very well.
Also clean the break with acetone and dry before you glue it.
Don Leister |
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Jack Rushing Member
Joined: 23 Mar 2007 Posts: 170
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Posted: Mon Apr 16, 2007 7:08 pm Post subject: |
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Leif is right. hide glue does not work. I learned the hard way. it fell
apart about an hour after I starting playing. I now use loctite super
glue. So far, it is holding very well. Maybe I should have splined or
pegged it too, but it was a nice clean break. |
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fiddlemaker Junior Member
Joined: 25 Mar 2007 Posts: 5 Location: Virginia
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Posted: Fri May 11, 2007 9:21 am Post subject: |
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I have used Gorilla glue successfully for this repair. Use caution though because it expands and you have to keep it wiped off before it dries or you will have to chisel off the excess. |
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Jack H. Super Member
Joined: 24 Mar 2007 Posts: 346 Location: Israel
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Posted: Fri May 11, 2007 10:19 am Post subject: |
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JacK Rushing wrote: | Leif is right. hide glue does not work. I learned the hard way. it fell
apart about an hour after I starting playing. I now use loctite super
glue. So far, it is holding very well. Maybe I should have splined or
pegged it too, but it was a nice clean break. |
I would spline it. It will come apart at some point!
Jack Havivi |
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Jack H. Super Member
Joined: 24 Mar 2007 Posts: 346 Location: Israel
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Posted: Fri May 11, 2007 10:20 am Post subject: |
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fiddlemaker wrote: | I have used Gorilla glue successfully for this repair. Use caution though because it expands and you have to keep it wiped off before it dries or you will have to chisel off the excess. |
Ya, gorilla glue works well for a lot of things, but with a small gluing surface I would worry about the air bubbles not allowing good contact... but then again it IS gorilla glue... |
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fiddlemaker Junior Member
Joined: 25 Mar 2007 Posts: 5 Location: Virginia
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Posted: Fri May 11, 2007 11:10 am Post subject: |
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Jack H. wrote: | fiddlemaker wrote: | I have used Gorilla glue successfully for this repair. Use caution though because it expands and you have to keep it wiped off before it dries or you will have to chisel off the excess. |
Ya, gorilla glue works well for a lot of things, but with a small gluing surface I would worry about the air bubbles not allowing good contact... but then again it IS gorilla glue... |
When I say I use Gorilla glue I was referring to intalling a spline, not just gluing the tip back on. |
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byacey Member
Joined: 29 Mar 2008 Posts: 105 Location: Edmonton, Alberta
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Posted: Sat Mar 29, 2008 11:51 pm Post subject: |
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For any kind of joint but especially for oily hardwoods, G2 epoxy by Industrial Formulators is THE stuff to use. They laminate wooden aircraft props with this glue. It ain't coming apart. I have used this on broken bow tips, but it's still wise to put a slit on the centerline and laminate in a reinforcing slip of wood. Model aircraft birch plywood can be obtained in very thin pieces and may be stained the same color as the bow. |
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Mat Roop Senior Member
Joined: 24 Mar 2007 Posts: 911 Location: Wyoming Ontario
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Posted: Thu Apr 03, 2008 11:06 pm Post subject: |
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Thanks everyone for all the input... I guess I will try G2 first......Mat |
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M.Lange Member
Joined: 30 Apr 2008 Posts: 81 Location: Germany
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Posted: Thu Jun 26, 2008 1:23 pm Post subject: |
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After rehairing my bow, the tip broke off.
Here is a picture:
It is a clean crack and the glueing surface is pretty big.
Do you think it is sufficient to glue it with cyanoacrylate, or should I spline it?
If so, what kind of wood should be used and how deep should I cut the slit for the spline?
Thanks a lot,
Matthias |
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Jack H. Super Member
Joined: 24 Mar 2007 Posts: 346 Location: Israel
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Posted: Mon Jun 30, 2008 6:08 pm Post subject: |
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M.Lange wrote: | After rehairing my bow, the tip broke off.
Here is a picture:
It is a clean crack and the glueing surface is pretty big.
Do you think it is sufficient to glue it with cyanoacrylate, or should I spline it?
If so, what kind of wood should be used and how deep should I cut the slit for the spline?
Thanks a lot,
Matthias |
Hey,
Use crazy glue and either spline it with Pernambucco ( not stained birch) or you can use a pin, dowel or screw from inside or the outside. |
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Stefano Junior Member
Joined: 29 Jun 2008 Posts: 7 Location: London, Ontario
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Posted: Tue Jul 01, 2008 1:27 am Post subject: |
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At the Banff Vioin Restoration workshop last summer we did a repair of this sort under the supervision of Derek Wilson. We used G2 and Derek. with amazing skill. invisibly pinned the head as well with broken jeweller's saw blades. To do this he used an Archimides hand drill and drilled the hole free hand carefully measuring everything-- and of course looking through a loupe. Not a job for an amateur! (For those of you who don't know, Derek is No. 21 in the Hill catalogue) The repair came out INVISIBLE with some astounding touch up work. Best of luck, and don't rush!
Stefano |
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M.Lange Member
Joined: 30 Apr 2008 Posts: 81 Location: Germany
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Posted: Tue Jul 01, 2008 8:49 am Post subject: |
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Thank You Jack and Stefano.
I don't have any Pernambucco to make the spline, so I will try to pin it.
Stefano, I don't think I really understand your method. Where do you drill the hole? From the underside, as it is done with normal pins? And which diameter should I choose for the holes?
Matthias |
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