[time-nuts] He is a Time-Nut Troublemaker....

[Bruce Griffiths]

Chuck

It was a paper written around 1942 detailing the procedures used to
align the sights of mass produced rifles for which it was impractical to
have each rifle individually adjusted on a firing range.
Unfortunately I dont think I have a copy of this any longer, however
I'll keep an eye out for it.
The alignment jig used a mirror attached to a cylindrical plug that was
a close slip fit into the end of the bore.
It wasn't perfect but far better than not adjusting the sights at all.

Bruce


Chuck Harris wrote:
> Could you be more specific, and perhaps provide a reference?
>
> Paul Mauser's group was pretty fussy about sighting through the
> new barrels, and bending them a little here and there to make sure
> their bores were perfectly straight.  The WWII records on the M1 Garand
> talk of using a bore scope to adjust the adjustible iron sights.
> The WWII records on the M1 Carbine talk of the same technique.
>
> -Chuck Harris
>
> Bruce Griffiths wrote:
>   
>> Mark Sims wrote:
>>     
>>> I got to play with a custom .50 BMG that shoots meaningful groups at 1500 meters...  the maker's definition of
>>> "meaningful group" is "smaller than your head".  I managed to put two rounds through pretty much the same hole.
>>> Don't know where most of the other 18 rounds went...  Then there was his .17 cal varmint rifle.  Does wonders for
>>> groundhoggies at 500 yards.  Most gawd awful recoil through.  I was black and blue for a month.  The barrel and all
>>> the hardware in those guns is finished to optical tolerances and maintains it despite having just a little less
>>> energy than a small nuke going off each time you fire.
>>>
>>>
>>>       
>> The fact that the direction in which the last 4" of the barrel largely determines the initial trajectory of the
>> bullet (in absence of crosswind etc) was made use of to assist in alignment of the sights during mass production of
>> infantry rifles during WWII.
>>
>> Bruce
>>
>>     
>