One wonders why dimensions change with each lot?
Weird.
thorn
Let me try to answer that question with a simple explanation:
It really boils down to what is called ?
Tolerance stacking? As you may know when building parts, it?s almost impossible to mass produce those parts to an ?exact? dimension??.hence the design engineers allow for Tolerances either + or - .
For instance a parts length might be spec. at .023 inches +/- .003 ? That simply means the part can be no longer than .026 inches or any shorter than .020 or any measurement in between.
Now when building a complex machine, where many of these parts will co-mingle and rely on each other to function ??? that?s when tolerance stacking can occur. Some parts will be bigger than the exact measurement. or + and others may be smaller than the exact measurement [ but within the specified tolerances ]. It is RARE .but sometimes these tolerances will cancel themselves to zero ??? but more often than not ,the machine will show ?tolerance stacking? in the POSITIVE or NEGATIVE .
So when dealing with critical parts that must move together design engineers have to be concerned about this ?stacking? and design parts that can control and minimize those effects. In the Walther pistol ??.. the different sized Striker assemblies are used to account for the variance that occurs when dimension stacking of the tolerances presents itself.
This does not mean that Walther is sloppy in their manufacturer process ?.it is simply a result of ?
mass production? where dies wear down as they punch out parts etc. etc. AND drill bits get duller as they work and therefore cut holes a bit differently.
Hope this helps answer the question???
JF.