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Hide Glue and Cocobolo

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Forum topic by shipwright posted 04-25-2011 01:08 AM 1897 views 0 times favorited 10 replies Add to Favorites Watch
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shipwright

5097 posts in 1489 days


04-25-2011 01:08 AM

Anyone have experience with gluing oily woods like Cocobolo with hide glue? I’m sort of late in asking because I’ve already glued up a turning blank and no, I didn’t wipe with acetone or lacquer thinner. I’m probably going to give it a try tomorrow and stand as out of the way as I can, but any experienced advice would be handy to have.

This is the blank. It’s going to be (maybe) the handle / knob for my chevalet here at home.

Any Cocobolo specific turning tips would also be appreciated as I’ve never turned it before. I have turned Lignum Vitae which seems similar.

-- Paul M ..............If God wanted us to have fiberglass boats he would have given us fiberglass trees. http://prmdesigns.com/


10 replies so far

View a1Jim's profile

a1Jim

112335 posts in 2268 days


#1 posted 04-25-2011 03:29 AM

As long as you have your bullet proof vest on and a facesheild and stand 8ft away you should be ok. LOL. Seriously I would keep the speed down low. The other alternative is to heat it because thats the good part about hide glue it comes apart with heat, clean it up with acetone and use a modern glue to reglue.

-- http://artisticwoodstudio.com Custom furniture

View LittlePaw's profile

LittlePaw

1571 posts in 1769 days


#2 posted 04-25-2011 03:42 AM

belli-intelestink in4! I’ll have to keep it on file for when . . .

-- LittlePAW - The sweetest sound in my shop, next to Mozart, is what a hand plane makes slicing a ribbon.

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shipwright

5097 posts in 1489 days


#3 posted 04-25-2011 05:28 AM

Jim, As near as I can figure, there are 63 pieces here, mostly in perfect alinnment with either another piece or with grain so I know you’ll forgive me if I pass on the disassembly option. It would be very much faster and easier to start from scratch again. On top of that most of the “modern” glues are as strong as hide glue so I guess I’ll just be careful and “do some research”. I’ll keep you posted.

-- Paul M ..............If God wanted us to have fiberglass boats he would have given us fiberglass trees. http://prmdesigns.com/

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a1Jim

112335 posts in 2268 days


#4 posted 04-25-2011 05:58 AM

Like you Paul my biggest concern is that you didn’t use acetone to clean off the oil. Just be careful and be ready to move fast . good luck bud.

-- http://artisticwoodstudio.com Custom furniture

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shipwright

5097 posts in 1489 days


#5 posted 04-25-2011 06:59 AM

Keep an eye on this space. If it works out, or if not, I’ll post the results. If I’m in the hospital I won’t.
Just kidding. :-)

-- Paul M ..............If God wanted us to have fiberglass boats he would have given us fiberglass trees. http://prmdesigns.com/

View BritBoxmaker's profile

BritBoxmaker

4401 posts in 1727 days


#6 posted 04-25-2011 12:26 PM

The only tip I can think of is to wipe the pieces down with denatured alcohol prior to gluing to remove surface oil. Oh well hind sight is a marvelous thing.

-- Martyn -- Boxologist, Pattern Juggler and Candyman of the visually challenging. http://www.theartofboxes.com

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Pop

419 posts in 2637 days


#7 posted 04-25-2011 06:19 PM

Hi Paul, I can’t say anymore than has already been said about acetone wiping. My one experience with cocbolo was that it was stringy and tore out on small beads etc.

Pop

-- One who works with his hands is a laborer, his hands & head A craftsman, his hands, head & heart a artist

View reggiek's profile

reggiek

2240 posts in 1961 days


#8 posted 04-25-2011 07:17 PM

I have been turning cocobolo for a while….it can be hard to glue as the wood is brittle, oily and has a tendency to shear easily. It turns well….but the dust can be very irritating to some….It smells almost like cinnamon when cutting. This wood is great and holds details well but it easliy cracks and splits when using screws or other fasteners (pilot holes are required)....

For glueing, I will typically rough up the surface with 60-80 grit paper…..wipe off with acetone….then glue up…I have heard that hide glue does not work well on this wood (though I have not tested this)...I have been using Titebound III and it has worked great….I have also used Polyureathane glues (like gorilla glue) and they also hold well…..Cyano glues like super glue and what have you will not work well with this wood as both are very susceptible to shearing…using these glues will cause the strength of the joint to be dramatically reduced. (I use superglue like double sided tape for this wood….a tap with a mallet and the two pieces shear right off).

In this case I think what happens will depend on the cuts that you do….be careful not to catch the piece as the shearing force will easily tear the joint apart.

-- Woodworking.....My small slice of heaven!

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HorstPeter

117 posts in 1520 days


#9 posted 04-25-2011 09:03 PM

I haven’t glued any cocobolo with hide glue so far, nor seen any cocobolo in real life yet actually. So I can’t help with any info here.

What I would do however, if you have the time and some leftover pieces of cocobolo, is to glue some scrap without wiping it as well and then test breaking it apart and see just how easy/hard it is to do. That should give you a better idea of what to expect when you turn on the lathe, right?

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shipwright

5097 posts in 1489 days


#10 posted 04-26-2011 12:19 AM

One of my favorite expressions is “God hates a coward.” so I gave the turning a try. Bad news: the glue joints wouldn’t withstand the forces of a lathe chisel. The good news: I’m alive, unhurt and the owner of a very nice looking Cocobolo knob. I’ll explain how I did it and show a few more photos on my Chevy II blog.

Thanks for the tips.

-- Paul M ..............If God wanted us to have fiberglass boats he would have given us fiberglass trees. http://prmdesigns.com/

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