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Main Boards => PowWow => Topic started by: Cupcake on May 02, 2008, 10:55:00 PM

Title: Bowyers - Hose Clamp Pressure Change
Post by: Cupcake on May 02, 2008, 10:55:00 PM
I was wondering if any bowyers take into account the increase in clamping pressure when a hose clamp system is put in the heat box?

I have seen that a starting pressure of 70psi is commonly used.  That seems like a lot of pressure to me.  Using the "Ideal Gas Law" if a hose clamp starts at 70psi at room temperature it will reach 80psi at 150F.  Is this too high?  Does anyone account for this?

I am getting ready to -you know what- and want more data.

(I also want more Stone Ruination Pale Ale but the misses will be here any minute)  Is my typing slurred?
Kevin
Title: Re: Bowyers - Hose Clamp Pressure Change
Post by: Holm-Made on May 02, 2008, 11:01:00 PM
I use a starting pressure of 60-65 in my hose.  Some guys start with 70-80.  I don't think it matters much.  I've never had a problem.  Chad
Title: Re: Bowyers - Hose Clamp Pressure Change
Post by: Dan Bonner on May 03, 2008, 01:32:00 AM
I routinely glue up at 100psi. i wouldnt sweat the 80 psi at all.
Title: Re: Bowyers - Hose Clamp Pressure Change
Post by: Glenn Newell on May 03, 2008, 08:06:00 AM
I have always used 60# in my hose...Glenn...
Title: Re: Bowyers - Hose Clamp Pressure Change
Post by: Crooked Stic on May 03, 2008, 10:48:00 AM
I use 70 lbs.The thing that worries me is how long a plywood form will repedatly take these pressures. I plan to make all my straps to go all the way around the form.
Title: Re: Bowyers - Hose Clamp Pressure Change
Post by: M60gunner on May 03, 2008, 02:39:00 PM
Does this mean you will be ready to make the limbs for my "Warf"?
Title: Re: Bowyers - Hose Clamp Pressure Change
Post by: Glenn Newell on May 04, 2008, 12:18:00 AM
I've made over 100 bows on one of my forms and it still looks straight...Glenn...
Title: Re: Bowyers - Hose Clamp Pressure Change
Post by: Cupcake on May 04, 2008, 10:52:00 AM
M60gunner,
I will make limbs for your Warf.  You probably want me to practice a bit on other things so I hope that you are not in a hurry.
Kevin