Wood Glue Comparison,Woodworking Tools Chicago Il,woodworking mallet plans,new woodworking books - Easy Way

04.07.2015, admin  
Category: Dresser Woodworking Plans

I had a strong suspicion that the change in the sound and energy of my guitars may have had something to do with the hardness property of the hot hide glue.
Please keep in mind that this is only one test and one property of the glues mentioned in this article. Titebond was the most surprising as a large chunk of it broke away from the first layer of glue. There were some late additions to the test which included: Titebond All Purpose White glue, Loctite Super Glue, StewMac 20 Medium super glue and Zpoxy finishing resin. After what I have learned from these tests I am now conducting build tests on LMI's white glue, LMI's hide glue (which has been my glue of choice for several years) and Titebond white all purpose wood glue.
Construction adhesive isn't a glue in a bottle like Gorilla Glue, it's a thick goo in a cartridge like 5200.
So, I set out to test all of the common glues available to luthiers to see which glue is truly the hardest and to see if there really is a measurable difference in the hardness.
To get WoodenBoat delivered to your door or computer, mobile device of choice, etc, click WB Subscriptions. The proper measurement procedure (for most soft materials) is to take the reading, after a one second dwell, after pressing the gage against the glue. However, I believe that this test indicates that this glue is considerably softer than all of the other glues tested. It stands to reason that a harder glue may be more efficient in transmitting vibrations through a joint more efficiently than through a softer glue. However, if we attach the braces with a very hard glue this will not dampen the energy [as much] as if we used a much softer glue. I don't believe it is the same glue as LMI's white glue as the smell is different, the viscosity is thinner and it has that slipperiness to it like TB's Original Formula.

Although I don't claim to be an expert on this subject my testing has shown me that glue hardness is a factor perhaps we should consider. However, we found no significant deflection when price of dry wood only once satisfied with the substrate can. To test the glues I took a piece of Ash and milled out identical cavities in which I poured the glue I intended to test. The highest Shore D scale number, reflected in the results below, is the measurement when the indenter point was initially placed on the surface of the glue. I was informed, by a knowledgeable chemist, that glue can be made harder and more brittle by adding Borax to the formulation. Using the same methodology as above I formed a dam of masking tape and then poured glue into the dam area. This comparison gives luthiers more data to consider when selecting the appropriate glue for their instrument. Many luthiers use hot hide glue on their instruments but I was actually intimidated by the thought of the entire process.
I think the definition of the common words below shed new light as I followed my quest to improve my guitars by choosing the glue I use. The epoxy thoroughly adhered to the strongest of the off-the-shelf glues, the 2-part resorcinol, breaking completely at the wood rather than the glue line. This test has absolutely no relavance on glue strength or many other factors that a luthier should consider when selecting glue. However, I am now convinced that the glue used on an instrument has a direct relation to sound, volume, vibration dampening and the overall deadening of an instrument. While LMI's white instrument glue had a low range of 2 and hardness just 2 points below hide glue.

After several trips visiting Frank Ford's website, studying his testing and repair techniques of using hot hide glue, I finally had enough encouragement to convince me to try this glue. To measure the glue's hardness I used a Shore D Durometer Hardness tester which is a handheld instrument that uses a spring loaded conical cone or indenter. The goal was to test all of the common glues available to luthiers, to determine which glue is truly the hardest and to see if there is a measurable difference in the hardness. The lowest measurement, in the Shore D column, is after 30 seconds holding the gage against the glue when the indenter stopped penetrating the surface. Although I did not answer my original question there is a measureable difference of each glue's physical hardness property. We all know that when we tap a brass cymbal and then tap a piece of wood there is a huge difference is volume, sustain and tone. Next I ran the wood & glue through my thickness planer so I removed barely enough glue to expose a consistent flat surface. My hypothesis was that when I used Titebond on my previous instruments that some glues may actually dampen the string energy transference throughout the joints of the instrument but I had no valid proof. Based on the results above, there truly is a measurable difference between all of the glues. Gorilla Glue is supposed to be applied to one surface and the other mating surface is to be moistened with water (which I did) and then both surfaces are to be clamped together (which I did not do). Another side point that was learned is that some glues will chip during machining and actually delaminated from the two applications within the cavity.

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