Re: [lro] Nut's and bolts

From: David Scheidt (dmschei@attglobal.net)
Date: Wed Feb 19 2003 - 13:19:22 EST

  • Next message: Frank Elson: "Re: [lro] Nut's and bolts"

    >On 2/18/03 10:15 PM, "Peter Ogilvie" <roverhi@yahoo.com> wrote:
    >
    >> Believe the 90 and 110's were all
    >> metric. So I guess Britain went metric sometime after
    >> '72 and before '84.
    >
    >My 110 is "mostly" metric. The oddball nut (is that a redundant term?) does
    >jump out once in a while.
    >
    >When I asked an engineer at a company I once worked for why they didn't go
    >all metric with their fasteners, his reply was that it was a lack of special
    >taps and dies in metric sizes that prevented their fully going metric. They
    >needed taps and dies that would account for the added thickness of some hard
    >anodizing procedure. He said it wasn't a fastener issue, more of a tooling
    >issue. That was 12 years back, so I suppose they've overcome that hurdle
    >now.

    You'd be surprised. The stuff often exists, but is much more
    expensive than standard stuff. That added to the cost of making new
    jigs and other assembly tooling (and things like maintenance manuals,
    stocking service parts) make it non-economical to change existing set
    ups.

    >Perhaps LR couldn't re-tool (or just didn't want to) some machines that
    >built gearboxes or whatnot on the production line, leaving them with the
    >oddball measurement standards?

    It's pretty brainless to change the fastener that holds on a fender from
    Whitworth to UNF to metric. For something like a gearbox, which has
    lots of machined parts it's much more costly. It's also not a part
    that's routinely serviced by the end user, which means that a gearbox
    repairer is a specialist. Specialists can be expected to buy odd
    tools and replacement fasteners.
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