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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...@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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