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    Re: Manufacture new Bygraves?
    From: Brad Morris
    Date: 2009 Jul 9, 15:01 -0400

    Hi Gary
    
    I would dearly loved to have extended the resolution and scale lengths, added 
    in those second scales alluded to in the Bygrave patent and etcetera, but I 
    believe the consensus now to be 'copies of the MHR-1'.  Note that this is NOT 
    a copy of Bygraves original manufacture.  That device suffers from the 
    in-ability to lock the reference of the tubes to each other.  Why promulgate 
    that design, when the subsequent MHR-1 was clearly superior in manipulation.
    
    There is almost no doubt in my mind that what you have described for pipe 
    sealing is very similar to what I will find inside the MHR-1.  That is what I 
    meant by a cam.  By rotating the locking handle, it rotates cams out to 
    contact with the inside of the pipe.
    
    Best Regards
    Brad
    
    
    
    
    -----Original Message-----
    From: NavList@fer3.com [mailto:NavList@fer3.com] On Behalf Of glapook---.net
    Sent: Thursday, July 09, 2009 2:26 PM
    To: NavList
    Subject: [NavList 9045] Re: Manufacture new Bygraves?
    
    
    If you go to a plumbing supply house you can buy a device for capping
    off pipes that consists of a cap with an extension that protrudes
    inside the pipe. Turning a screw in the center of the cap causes this
    extension to expand and lock itself firmly inside the pipe thereby
    sealing the pipe. I was pondering if this "off the shelf' item could
    be adapted to hold the two scales immobile like the mechanism in the
    HR1.
    
    That said, the reproductions I have made by forming a plastic tube
    containing the cosine scale out of page protector sheets do not
    exhibit any such problem, they fit together tightly enough so that
    friction is quite sufficient to keep the scales in alignment.
    
    gl
    
    On Jul 9, 6:23 am, Brad Morris  wrote:
    > Hi Bill
    >
    > I certainly can send you photos of my MHR-1.
    >
    > The locking mechanism is internal to the tubes and I believe to be a cam 
    mechanism, but have NOT opened up the tubes to see the inside.  In order to 
    replicate the device, we would have to take it to pieces and have a 
    Mechanical Engineer create a drawing package.  I do have on one staff who I 
    would trust to perform this work.
    >
    > My view is that since it was put together, I can probably take it apart and 
    put it back together.  This would naturally be a high risk activity, so I 
    want to be sure that we are going to proceed all the way to fruition.
    >
    > Best Regards
    > Brad
    >
    > -----Original Message-----
    > From: NavList@fer3.com [mailto:NavList@fer3.com] On Behalf Of engin...{at}clear.net.nz
    > Sent: Thursday, July 09, 2009 1:55 AM
    > To: NavList@fer3.com
    > Subject: [NavList 9039] Re: Manufacture new Bygraves?
    >
    > Brad and others
    >
    > There certainly seems to be some interest.
    >
    > What I had in mind was a small consortium to make a few replicas of the 
    Bygrave position line slide rule. Gary LaPook has shown that it is possible 
    to produce the scales, something that works like one and much more. I was 
    thinking of producing something that looks like an original Bygrave, made 
    from similar or same materials (with the possible exception of the scales). I 
    was not thinking of marketing and manufacturing for profit (much), but rather 
    at cost just for those members who wanted one.
    >
    > Do you think, Brad, you could send me some dimensioned sketches of your 
    genuine Bygrave, off list if you prefer, with notes about what you think the 
    materials might be? A close up picture of part of the scales would be useful 
    too, for those who want to think about making the scales with the same fonts. 
    I could then perhaps put together  a materials list and see what people could 
    do and where.
    >
    > Bill Morris
    > Pukenui
    > New Zealand
    >
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