Mensaje por lueger » 13 Feb 2009 12:30
Bueno, pues ppngo una parte de un articulo americano de surplusrifle.
An additional portion of their examination of these two rifles concerns the steel used in the
construction of the 1893 pattern receivers of these rifles. The Spanish steel was of an
inferior grade (as compared to the original German produced models). Unfortunately, this
was a common practice of Spanish arsenal made rifles. Apparently they had a propensity
for disregarding generally accepted principals of metallurgy. The hardness of the two
receivers was determined through the use of a low tech, but thoroughly reliable device
called a Scleroscope. This simple, but reliable device has been in use in numerous types
machining and manufacturing industries for many years. It consists of a glass cylinder
marked with a Rockwell "C" scale, and a ¼ inch alloy ball of known hardness. The cylinder
is placed over the receiver, and the ball released. The level to which the ball rebounds to
is noted on the scale. Upon comparing the level to which the ball rebounded when
compared to dropping the ball on a piece of hardened tool steel it is readily determined
that the steel used in the manufacture of these two rifles is of an inferior (softer) grade as
opposed to rifles manufactured by German or Belgium companies.
An additional attribute of the Scleroscope lies in the fact that this device does not
penetrate the surface of the weapon being evaluated. Other devices penetrate the
surface, and therefore will mar the finish on the rifle being evaluated. These other devices,
while undoubtedly more definitive, are more cumbersome to use, and substantially more
costly. The Scleroscope is simple to use for the average person, is very portable, and
requires no batteries or sophisticated knowledge for its use.
The combination of a two-lug bolt system, a soft steel receiver, and a rifle chambered and
rebarreled for a cartridge that generates substantially higher chamber pressures than what
the original design was meant for can be a prescription for disaster.
Bueno, pues ppngo una parte de un articulo americano de surplusrifle.
[color=blue]An additional portion of their examination of these two rifles concerns the steel used in the
construction of the 1893 pattern receivers of these rifles. The Spanish steel was of an
inferior grade (as compared to the original German produced models). Unfortunately, this
was a common practice of Spanish arsenal made rifles. Apparently they had a propensity
for disregarding generally accepted principals of metallurgy. The hardness of the two
receivers was determined through the use of a low tech, but thoroughly reliable device
called a Scleroscope. This simple, but reliable device has been in use in numerous types
machining and manufacturing industries for many years. It consists of a glass cylinder
marked with a Rockwell "C" scale, and a ¼ inch alloy ball of known hardness. The cylinder
is placed over the receiver, and the ball released. The level to which the ball rebounds to
is noted on the scale. Upon comparing the level to which the ball rebounded when
compared to dropping the ball on a piece of hardened tool steel it is readily determined
that the steel used in the manufacture of these two rifles is of an inferior (softer) grade as
opposed to rifles manufactured by German or Belgium companies.
An additional attribute of the Scleroscope lies in the fact that this device does not
penetrate the surface of the weapon being evaluated. Other devices penetrate the
surface, and therefore will mar the finish on the rifle being evaluated. These other devices,
while undoubtedly more definitive, are more cumbersome to use, and substantially more
costly. The Scleroscope is simple to use for the average person, is very portable, and
requires no batteries or sophisticated knowledge for its use.
The combination of a two-lug bolt system, a soft steel receiver, and a rifle chambered and
rebarreled for a cartridge that generates substantially higher chamber pressures than what
the original design was meant for can be a prescription for disaster.[/color]