[C320-list] Leak in bilge

[Utility Email]

Bruce

The Society of Women Engineers (SWE) website reference is great.  I have one of their engineering dictionaries that gets a lot of use by the younger engineers in my design office (bought it in college 25 years ago, out of print now).  Thanks for their website reference, there is a lot of good stuff there that I didn't know about!  Thanks.

Dave  



On Jan 22, 2011, at 6:05 PM, "Bruce Heyman" <bruceheyman at cox.net> wrote:

> David,
> Thanks for commenting!  The reason I brought up Archimedes is because he is
> widely credited for figuring out simple machines and as far as I'm concerned
> a bolt and nut are a simple machine.  The threads form the incline plane.
> http://www.swe.org/iac/lp/inclined_03.html
> Best,
> Bruce
> Somerset #671 SoCal
> 
> -----Original Message-----
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> Subject: Re: [C320-list] Leak in bilge
> 
> Well, I'm a structural engineer.  After reading this post, I was confused
> too.  Here are some clarifying remarks by an SE.
> 
> 1.) If you draw a free body diagram, you will see that the keel bolts do in
> fact hold up the keel.  The connection between the keel bolt nut and the top
> of the keel will in fact stretch these large SS bolts as it compresses the
> hull in this area.
> 
> 2.) I would agree with this statement, but adding one important item that
> these bolts do in fact support the keel.
> 
> 3.) True that a threaded bolt and threaded nut transfer rotary gorge into
> vertical movement along the axis of the bolt to hold two surfaces together.
> It is not clear to me what the rest f the statement is getting at,
> especially the remark about Archimedes who ave us th principal of buoyancy.
> 
> 4.) A torque wrench is typically calibrated to take into account the
> friction between the nut and the threads in the, so called, "machine.". The
> torque in the wrench is calibrated to relate to the axial load (or
> pretension) in the bolt.
> 
> 5.). I'm not sure if this is correct.  Preload is not related to material
> strength.  Machine design tables would provide this information.  Preloaded