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    Re: Cylindrical Slide Rule / tube lengths
    From: Tom Sult
    Date: 2010 Jan 30, 12:43 -0600

    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
    >>>
    >>>
    >>>
    >>>
    >>>
    >>
    >>
    >>
    >>
    >>
    >
    >
    >
    >
    
    
    
    

       
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