Main Discussion Area > Bows
a little glue testing
freke:
--- Quote from: superdav95 on October 07, 2022, 12:17:15 am ---
--- Quote from: simk on October 06, 2022, 04:10:08 pm ---thanks for interesting input guys!
maybe Del was right and I should repeat with bowwood scraps :)
I remember your postings making bladder glue dave...did you post pics of the ripped apart woodblocks?
I did once check the data sheet for titebond because I wanted to know temperature resistance. They say its around 100deg.cel. Useful information Eric, thanks!
I had been thinking quite a bit on that same "biggest question" Mark, a while ago. For me there are other factors seem to be more important when it comes to keep reflex. A (reflex)significant creep should be seen or felt on the tips imho. And my friend, using tb3, makes faster bows than I do (-:
yes, Epoxy, BowEd
will break the samples tomorrow.
cheers
--- End quote ---
Simk. No I did not post pics of the test pieces. All 8 but one broke at the wood and not the glue line. The one that failed (sort of) was I believe my fault in clamping. The glue line on that piece was thicker then the others. All pieces were wetted with thinned down glue and grooved as well. All had decent squeeze out but on the one that failed the underside had an air pocket in the glue line and why I believe it failed. Even then it failed taking the majority of the wood with the break. All the others broke on wood only or the glue line with layer of saturated wood with dried glue. I was happy with this test as it was merely testing the 20 Lpi grooves and the homemade glue and sizing. The sturgeon glue seemed to quite good for strength. A proper test for my purposes may have included some grooved horn scraps I suppose. I think there is merit in conducting a test with hide glues, fish bladder glues, ea40 and other wood glues and epoxy. A break test could be set up with a press with a measure scale to compare results in footpounds at the breakpoint. This would test the holding strength of the glue. There is also another test that can be done the reflex return test. This test would show how much reflex creep is returned with each type of epoxy, natural glue or wood glues. This test could be done using a simple single laminated bow limb placed in a vice and measure the amount in inches the reflex immediately returned and then at intervals of each min or 5 mins. To me this would be an invaluable test and I may do this one myself one day as this has been in the back of my mind as well. My gut tells me that ea40 utilizing the hot box and mixing 2 parts a and 1 part B as the can instructs my show the better results. One day we shall see.
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There is also another test that can be done the reflex return test. (-P
simk:
I personally do not believe, that the type of glue change reflex-return behaviour. Many other, more important factors in play here. But I still would be interested in test results. If somebody approaches I would suggest working with xxxxx-glass to eliminate the random factors of wood 😅
superdav95:
What test were you thinking freke???
freke:
--- Quote from: superdav95 on October 07, 2022, 08:31:00 am ---What test were you thinking freke???
--- End quote ---
Na, it was just a reaction to you post, I was actually thinking about it when I come to you post. I think most wood glue test would show pretty similar results and will break in the wood (should do). I am not experienced with lamination but learning, I believe most glue will work if we only ask the question if its strong enough to hold together - but dose some glue perform better, interesting?
superdav95:
Ok gotcha.
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