Primitive Archer
Main Discussion Area => Bows => Topic started by: ajooter on March 10, 2016, 06:20:34 pm
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Got me a couple inner tubed and wanted to laminate some woods together to make some levers. Do you guys split the inner tube in half or just use it as is in the round?
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Depending on the size of the tube you'll get more from it if you at least split it in half etc. It's easier to handle when just a single thickness.
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Road bike tubes I cut into 2 strips. Wideish tubes (ie mountain bike tubes) I usually cut into 3 strips.
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You can also cut it in 1/2" wide bands if you have a caul(http://i623.photobucket.com/albums/tt320/bubncheryl/Mobile%20Uploads/20160221_165826_HDR_zpsclekcllm.jpg) (http://s623.photobucket.com/user/bubncheryl/media/Mobile%20Uploads/20160221_165826_HDR_zpsclekcllm.jpg.html)
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That is why I love this place....ty gentlemen
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You can also cut it in 1/2" wide bands if you have a caul(http://i623.photobucket.com/albums/tt320/bubncheryl/Mobile%20Uploads/20160221_165826_HDR_zpsclekcllm.jpg) (http://s623.photobucket.com/user/bubncheryl/media/Mobile%20Uploads/20160221_165826_HDR_zpsclekcllm.jpg.html)
Keep sayin' to self, "Gotta make one of those peg/band cauls!"
What type tubes do ya usually use and what's distance rom pegs to caul's top surface?
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I go to the bike shop and get what they are throwing away, mostly mountain bike tires for the bands and the narrow tubes i cut in strips. The pegs are an inch down on the caul Mike and I use a screwdriver to get the bands on, a little leverage never hurt right😉
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Thanks knoll for posting that.
I'm about to make a caul and that design is way better suited for me than the way I was gonna go. Plus there's no need for a compressor or pump, and leaks aren't an issue at all. It will also find a use for all those rejected dowels/ non- arrows I've accumulated. Good stuff all around.
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I see said the blind man. Thanks for turning on the light bulb for me. John
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I took a car tire innertube and there are lines on it to cut around it nice and evenly.I cut mine about an inch and a quarter wide.That way when I wrap it on as hard as I can it is about 1/2" wide.That's just my way.It's overlapped to cover every square inch.There are other benefits of using black inner tubes with the quick curing of smooth on epoxy if it's warm and sunny enough outside.
(http://i920.photobucket.com/albums/ad41/Beadman1/DSCN1156_zpsoc9c0eap.jpg) (http://s920.photobucket.com/user/Beadman1/media/DSCN1156_zpsoc9c0eap.jpg.html)
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I have a load of off cuts of rubber roofing sheet which I use, cut into about 1" wide strips. It is V handy to have some cut shorter and thinner, this allows you to get something strapped in place before you start heaving on the bigger straps.
It's a damn good work out wrapping bows.
IMO it's good to get at least 2 layers of strapping. It will be hard to wrap too hard and squeeze out all the glue, it's much less harsh than rigid clamps and it distributes the pressure better.
Del
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Same.i have a roll of rubber roofing membrane that I cut into 7/8" x 6' long that work well.
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Really one of the main things for a nice thin glue line is to have or know of someone that has a drum or thickness sander.Innertubes will make the glue line almost invisible and that's what I want.Of course without starving or dry jointing it and innertubes won't do that too quick.Handy and useful thing to have around.
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I've gotten my best glue lines using inter tube bands to clamp glue ups. Any bicycle shop will give you used tubes if you ask. I cut the section with the valve stem out then cut the remainder lengthwise into 2 strips and I use 1 to wrap each limb. After its wrapped it can be formed on a caul for the intended profile.
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I have heard the thing to watch out for when using inner tubes is the cupping effect that is gives to thin backings such as bamboo. Has anyone experienced this?
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I do use a pressure strip above the backing for even pressure along and across both limbs. I don't do boo backing anymore so boo backing methods are irrelevant for me. However, you can make backing strips that mate up well with a boo backing.
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I have heard the thing to watch out for when using inner tubes is the cupping effect that is gives to thin backings such as bamboo. Has anyone experienced this?
On flat backings a rubber strip can theoretically apply more force along the edges than the centre especially with a wide backing.
The standard solution to this problem is a thin strip of card/thin wood etc running down the center of the backing to add some pressure along the middle.
Bamboo backing are slightly curved so don't suffer from this problem in my limited experience.
Del
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Del is spot on in my opinion, the flat backing is the one that needs a strip in the center not boo
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I have heard the thing to watch out for when using inner tubes is the cupping effect that is gives to thin backings such as bamboo. Has anyone experienced this?
I had cupping once in a small area and it was remedied, that was because the width varied. If the piece you are gluing on is wider you will run into sloppy workmanship. And I have done it both ways having straight limbs and tapered width. :) Hence the lam has to be tapered. What Del said makes sense something to keep in mind.
I basically do it the same as Beadman. Open form.
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