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Author Topic: Inner tube clamping method
monterey
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That 1/8" allowance at the stops Is a great idea. Also like the pinning of the lams to the riser.

I'm going to look into plexiglass as a pressure strips with the rope down the centerline as well. I've never worked with plexiglass so it could turn out to be a bad idea!

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JamesV
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There is long learning curve when using a rubber band form. I use a one piece band cut from a tractor inter-tube, spiral cut into one long piece. I clamp the riser and use the rubber band on the limbs. The trick to getting perfect glue lines is the pressure strip used. It has to be fairly stiff but bendable or you will get waves in the limbs and thickness variations in the glue lines. Forms are cheap to build and worth the effort if you build a lot of different bow designs.

James

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Dazzad
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Hey everyone, thanks for this excellent compilation of practical wisdom regarding the rubber band technique!
Like some of you guys, I'm heavily challenged by a lack of access to workshop machinery and equipment. Producing a top 'n' bottom airhose form is a bit out of reach, whereas I know I can make a combination rubber band/clamp form with what I have at my disposal.
Thanks again- I'm looking forward to being able to contribute my own photos and practical experiences to this thread when I have something to offer!
Darren

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Carson81
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I use heavy duty exercise bands. Not as cheap as inner tubes but I like the strength of them. I have never banded to a form, just wrap each limb then clamp to a board using blocks placed at intervals for desired profile. It gives you a lot of flexibility in creating different profiles.

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kenneth butler
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The rope goes under the pressure strip to increase pressure down the center line correct?thanks.Ken
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Bvas
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quote:
Originally posted by kenneth butler:
The rope goes under the pressure strip to increase pressure down the center line correct?thanks.Ken

No. The rope goes on top of the pressure strip.

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Bvas
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By adding rope, cord, or whatever..... you are creating a convex profile for your pressure strip. If not, the bands will pull more tension on the edges, and not evenly across the width of the limb.

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arachnid
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quote:
Originally posted by Bvas:
quote:
Originally posted by kenneth butler:
The rope goes under the pressure strip to increase pressure down the center line correct?thanks.Ken

No. The rope goes on top of the pressure strip.
I also thought that it gos on the bottom side. My pressure strip is a piece on thin wood and the bottom side is covered with rubber, so I glued a strip of narrow rubber along the middle of the bottom side.
Guess I'll change that now...

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Gundog68
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I did all ways. Innertube, Hoses , clamps.
Clamps are the savest. The work all the time in every condition. But the need the most time. Pressure hoses are fine, but i had to learn a lot because the first try the pressure leaks and that makes you hurry.. after fixing all the weak points this works fine.
Innertubes are the easiest way. But be aware of to much heat in a heat box. They make the innertubes weak.
One way is to use the inner tube method and put the hose above it. Just secure the hose with a rope. This methoth allows you to do the layout proper. Nothing will move when the pressure starts. You also do not need a top half of the form for those who will change some details in the layout.
You can also use the inner tubes and extra packing tape (for packing parcels) in difficult places. THis can be stretched too.
Currently i have the form so small it has about 3" parallel height to the contour of the bow. So i can wrap what i want. But this does not work with the air-hose ... it will crash the form.

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arachnid
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quote:
Originally posted by Gundog68:

One way is to use the inner tube method and put the hose above it. Just secure the hose with a rope. This methoth allows you to do the layout proper. Nothing will move when the pressure starts. You also do not need a top half of the form for those who will change some details in the layout.

That's a very good idea... Anyone else tried it?
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kenneth butler
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Thanks guys. I did understand that backwards. Ken
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Gundog68
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It was not my intention.. but it works fine.
Posts: 107 | From: Germany | Registered: Mar 2010  |  IP: Logged | Report this post to a Moderator
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