A flavorful tip for glue ups

[benush26]

When I first read this I also thought about sand, however the one thing that salt and sugar might do where sand would not, is crush to a smaller size by the force of the wood coming together.

I do remember an old friend who would take some of the powder below the grinder and sprinkle it on a glue surface, however I thought it was to darken the glue, not prevent slippage.

Would fine saw dust (maybe like that from MDF) help increase the friction without wicking away too much of the glue moisture? Especially since MDF contains so much glue??

Just a thought.

Be well,
Ben

[beeg]

Sand would be better, I'd agree. But none is available anywhere close.

Don't have sandpaper around?

[Gene Howe]

Sand would be better, I'd agree. But none is available anywhere close.

Don't have sandpaper around?

I'm frugal as well as lazy. A few grains of salt costs less than a sheet of sand paper and the salt easier to use.
I was actually referring to the fine sand someone else suggested.

[charlese]

Thinking it would be a good idea to throw in some information from the U.S.D.A.'s "Wood Handbook"-- Here is a small paragraph from the chapter titled "Adhesives with wood Materials" - - Also, at the end of this post a link to that entire chapter.

"Adhesion involves both mechanical and chemical factors
that control the adhesive’s ability to hold together two wood
surfaces. Because wood is porous, one mechanism of adhesion
is mechanical interlocking. Effective mechanical interlocking
takes place when an adhesive penetrates beyond
the surface debris and damaged fibers into sound wood two
to six cells deep. Further penetration into the cell wall microstructure
increases the mechanical interlocking and the surface area for adhesive contact with the wood. With many
adhesives, the most durable, water-resistant bonds develop
when the adhesive flows deeply into cell cavities and infiltrates
inside the cell walls. The standard for excellent bonds
is that the wood breaks away from the adhesive joint and
that the bond strength is equal to the strength of the solid
wood."

Chapter 10: http://www.fpl.fs.fed.us/documnts/fplgt ... ter_10.pdf

[Mike907]

I just came across Nick's take on this -

http://www.shopsmithacademy.com/Tips_Ar ... ue_Tip.htm

Mike

[BuckeyeDennis]

I just came across Nick's take on this -

http://www.shopsmithacademy.com/Tips_Ar ... ue_Tip.htm

Mike

That's a neat trick. But personally, I don't think I'd use it on any workpiece where the glue joint is going to be sawn, routed, jointed, planed, etc. Those 60-grit abrasive particles can't be good for the cutting edges. Which I guess leaves you with abrasive processes, if the glue joint needs to be shaped further.

[beeg]

I just came across Nick's take on this -

http://www.shopsmithacademy.com/Tips_Ar ... ue_Tip.htm

Mike

That's a neat trick. But personally, I don't think I'd use it on any workpiece where the glue joint is going to be sawn, routed, jointed, planed, etc. Those 60-grit abrasive particles can't be good for the cutting edges. Which I guess leaves you with abrasive processes, if the glue joint needs to be shaped further.

Your knot putting very much grit on the glue up. I wood think that you woodn't even notice ANY dullness caused by the grit.

[Sterling]

Sorry to chime in on such an inactive thread but I've done this, recently. I've glued up about 15 cutting boards using this technique, and all I have to say, if it survives salt corrosion, this is a winner. All it takes is a very few grains, maybe 15 or less per joint. On the cutting boards I only put salt at the very ends.

I even glued up several triangular shaped chunks of wood, with minimal slippage, so on the order of a 1/32"

It works great. Hope it lasts.

Sterling Skouson

[Sterling]

Make sure to use table salt, with the small grains. Kosher salt grains are just too big.

Sterling Skouson

[ChrisNeilan]

Seven years ago i made a segmented banjo rim. (I have yet to finish the banjo!) i used salt between the rings to keep them from slipping when clamping. Not a lot, just a little sprinkle. No failure yet, doubt it will ever fail. Finishing the project? That's for another day!