Air bubbles in sinew backing
Hi!
I layed the second layer of sinew yesterday and when I checked today I noticed several air bubbles in the sinew. Please see the attached picture. I had no bubbles in the first layer, so I am wondering what I did wrong. I worked according to the instructions provided by Adam's book. I think I didn't apply enough pressure when laying the bundles.
What is a good way to fix this? Can I heat it slowly and brush with warm water to reliquify the glue and apply finger pressure again?
Daniel
I layed the second layer of sinew yesterday and when I checked today I noticed several air bubbles in the sinew. Please see the attached picture. I had no bubbles in the first layer, so I am wondering what I did wrong. I worked according to the instructions provided by Adam's book. I think I didn't apply enough pressure when laying the bundles.
What is a good way to fix this? Can I heat it slowly and brush with warm water to reliquify the glue and apply finger pressure again?
Daniel
The area you pointed out is just a tiny problem... Where I circled could be a major disaster.... It looks that sinew didn't attach on the core... No matter how many layers you add after that... Once you brace the bow... It may pop off right from the core... Becareful....
The sinew was layed a day before taking the picture. It is thicker in the middle of the arm and in the area that you indicated it was still wet, hence the different color. By now it has the same amber color there too.
But there are two white streaks in this area, probably parts which probably stuck to my glove as I used the finger to flatten the sinew and were lifted. Then it must have lost the glue when I pushed this part back on.
But there are two white streaks in this area, probably parts which probably stuck to my glove as I used the finger to flatten the sinew and were lifted. Then it must have lost the glue when I pushed this part back on.
The way to eliminate bubbles is to ensure that all the components and the glue are at a high enough temperature (without cooking the sinew!) that any gas (water vapour or air) caught in the glue and sinew will contract during cooling. I am not sure that they can be eliminated after cooling/drying. If you are very worried, perhaps you should soak the sinew off and re-glue.
S
S
Maybe dont need so extrem way. Heat slowly bow (both limbs -not only one !) If youhave good small sharp scalpel or somthing like sharp needle, you can open buble . Next use a syringe and put in buble hot glue. Or dont use glue.If you choose one or second step, surely use hot flat iron tool and slowly vith pressure go in this buble.
I am not even sure that it will need to be fixed at all. There will be cracks in the glue anyway.
Stephen, I just noticed that my meat thermometer shows a room temperature of 30?C when it is really 23?C. It must have been damaged after I did the first layer. Probably water got in somewhere where it is not supposed to be. That probably explains it. I was wearing nitrile gloves and thus had no feeling for the temperature.
Dusan, good idea, I will try.
Stephen, I just noticed that my meat thermometer shows a room temperature of 30?C when it is really 23?C. It must have been damaged after I did the first layer. Probably water got in somewhere where it is not supposed to be. That probably explains it. I was wearing nitrile gloves and thus had no feeling for the temperature.
Dusan, good idea, I will try.
I know a little English..sorry..
I am produceing the glue( Turkish-?ega glue,orjinal)...
There isn't the mistake in my production(There isn't the bacterium,no high heat,no decaying..)
There is the micro bubble 1/100(In the dry condition glue) ....
You can't see normal....Magnifying glass It appears and In the strong light ..I added the picture...
Huge bubble weather is surpriseing us...Micro bubble isn't able to get out or a little .... In the watery glue , it always stays or a little...
I tested whole dry glue(hide glue,isinglass,cat-fish glue,?ega.)....... There is the mikro bubble in the dry condition ......
The brush carrys them..You can't see
When the glue become hard....micro bubble adds and they become large..
This problem.. I didn't find the remedy...I did the dust the glue..I did too much watery the glue..I heated 75-80 C....In the watery condition , I slowly mixed(The hours)....I didn't succeed...
They are(mikro bubble) combineing and they are becoming huge later...The wooden-tashin groove, the horn-tashin groove and between the sinew..Under, on,......Did you check these places?
100 brushes become good............Bad glue,bad bow..Good glue,good bow.... problem, micro bubble.
I am produceing the glue( Turkish-?ega glue,orjinal)...
There isn't the mistake in my production(There isn't the bacterium,no high heat,no decaying..)
There is the micro bubble 1/100(In the dry condition glue) ....
You can't see normal....Magnifying glass It appears and In the strong light ..I added the picture...
Huge bubble weather is surpriseing us...Micro bubble isn't able to get out or a little .... In the watery glue , it always stays or a little...
I tested whole dry glue(hide glue,isinglass,cat-fish glue,?ega.)....... There is the mikro bubble in the dry condition ......
The brush carrys them..You can't see
When the glue become hard....micro bubble adds and they become large..
This problem.. I didn't find the remedy...I did the dust the glue..I did too much watery the glue..I heated 75-80 C....In the watery condition , I slowly mixed(The hours)....I didn't succeed...
They are(mikro bubble) combineing and they are becoming huge later...The wooden-tashin groove, the horn-tashin groove and between the sinew..Under, on,......Did you check these places?
100 brushes become good............Bad glue,bad bow..Good glue,good bow.... problem, micro bubble.
I have used my finger nail to press down partially soft sinew and the bubles have disappered.
I do not think this is really needed tough, but I have newer made a horn bow...
I do not think this is really needed tough, but I have newer made a horn bow...
micro bubble
I haevnt this problem vith glue... I use only mi own glue . Cooked myself from sturgeon airbladers, sweat water fishes airbladers, elk and cow sinew, and sturgeon palate glue.
can you use your hand rip/tear the sinew form the bow easy?or your can easy rip/tear the sinew layer? i has use 2KG sinew and glutin/sinewglue/fishskinglue/bladdergule for the test about 4years, if less some step, the sinew layer is a butter engineering, i seen sinew layer and sinew strings on the old hornbow, some of them is matchstick and it's elasticity like the steel wire, some sinew layer elasticity more hard like bamboo, and all of them are one color, the yelow or white, the yellow+white is not a good sinew back ,you can use bamboo or forfex insert to white sinew and all sinew layer can be easy remove