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    Re: Cylindrical Slide Rule / tube lengths
    From: Wolfgang Hasper
    Date: 2010 Jan 31, 11:37 +0100

    I did some practical archeological research and
    investigated the (hidden) dimensions of HR/MHR, see
    attached drawing.
    
    (The .dxf can be opened with any CAD software, if you
    do not have any you can download Q-CAD here for free:
    http://www.qcad.org/qcad.html)
    
    Based on the dimensions found I ordered the tubes so we
    will not need to care for the lengths later.
    All those who would like to make a Bygrave, however,
    can cut the tubes, the Bygrave is shorter.
    
    I had an idea on how to make a simple locking
    mechanism, shown in the upper left part of the
    drawing.
    It uses simple materials and can be made with a jigsaw,
    no special parts needed.
    It is based on a number of longitudinal cuts in the end
    of the inner tube, creating a number of segments that
    can be bent outwards by a disc with circular wedges on
    its circumference.
    I will make a sample and see what it is worth.
    
    Thank you Gary for your plug details, this is really
    good to know!
    
    Wolfgang
    
    
    
    
    
    Am Samstag, 30. Januar 2010 19:43 schrieb Tom Sult:
    > I'm in for the whole meal deal!
    >
    > Thomas A. Sult, MD
    > Sent from iPhone
    >
    > On Jan 30, 2010, at 1:48, Gary LaPook
     wrote:
    > > I priced out the components today. The two inch
    > > plugs are $3.90, $7.80 for two. The threaded rod
    > > is $3.59 for 36 inches which I can cut to make
    > > three pieces long to make three locking devices.
    > > A self locking nut is $0.45 and a regular nut is
    > > $0.11. So with sales tax the parts for the locking
    > > mechanism come to $10.40 plus postage. If anybody
    > > is interested let me know.
    > >
    > > gl
    > >
    > > Gary LaPook wrote:
    > >> If you want to use the locking device that I came
    > >> up with and you can't buy the components where
    > >> you are I could purchase them here and ship them
    > >> to you. The plugs cost about five dollars each,
    > >> you need two of them, and I think the threaded
    > >> rod was about the same. I think it would cost
    > >> about twenty dollars for all the components
    > >> including postage if anybody is interested.
    > >>
    > >> gl
    > >>
    > >> Wolfgang Hasper wrote:
    > >>> I received a sample of those laminated paper
    > >>> tubes.
    > >>>
    > >>> The exterior surface is very smooth and even,
    > >>> rather matte than glossy. I am sure it can be
    > >>> used to put on printed scales without further
    > >>> treatment.
    > >>>
    > >>> By the way: I found white adhesive film in A4
    > >>> size that can be used in a laser printer.
    > >>>
    > >>> the interior surface is glossy, due to
    > >>> production on a core tube. (it is a coiling
    > >>> production process. No noticeable seam or other
    > >>> irregularity from the coil end on the outside
    > >>> though.)
    > >>>
    > >>> For ease of transport and to save on cost there
    > >>> the tubes should be cut to length at the
    > >>> manufacturer's. They provide precise cuts to
    > >>> right-angles which I think is a huge benefit and
    > >>> valuable help for our futher work. I will
    > >>> shortly receive information on the cutting cost.
    > >>>
    > >>> As I find only now those lengths are not
    > >>> sufficiently known yet. RvR's paper gives
    > >>> account of the visible:
    > >>>
    > >>> inner tube        something > 230mm with 198 mm
    > >>> of scale intermediate tube    225 mm
    > >>> outer/cursor tube    222 mm (this is reliably
    > >>> the true length of the tube)
    > >>>
    > >>> The intermediate tube will for sure extend into
    > >>> the base and end just before the "upper" cursor
    > >>> cut-out (marked II). (assumed cursor tube on
    > >>> zero stop) So the inner tube is visible there.
    > >>>
    > >>> The inner tube itself will be long enough to be
    > >>> sufficiently stabilised when fully drawn out,
    > >>> yet short enough to leave some space for the
    > >>> locking mechanism down in the base region (when
    > >>> slide rule is fully closed)
    > >>>
    > >>> Assume the black base is a "cup" slipped on the
    > >>> end of the intermediate tube.
    > >>>
    > >>> I will make a sectional drawing to determine the
    > >>> missing lengths and post it for discussion. Any
    > >>> comments welcome. Would you please tell me if
    > >>> anybody wants to have non-HR lengths?
    > >>>
    > >>> Wolfgang
    
    999
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