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7/13/2025, 5:15:40 PM
>>63978103
Tolerance stacking is just the layman term for what happens when multiple manufacturers are not using the same spec. You know it's not an accurate engineering term but you understand what it means to normies.
>We would see wider, more disparate issues if everything was just mildly out of spec
Not true, though. You can see that in the AR market and how "tolerance stacking" became widespread as a term. Basically most combinations of parts are functionally OK, but they're not accurately within milspec. Depending on how widely these parts deviate from the standard you can have off spec parts that happen to function well with each other or ARs that seem to malfunction more often but not enough for the hobbyist to really care about it.
The fact that people are using 3d printed frames and lowers and they're *mostly* reliable despite being squirted plastic and finished by hand indicates that deviating from the original spec tolerances isn't immediately catastrophic.
Look at for example picrel. That striker safety tab is three degrees off. Is it gonna lead to instant UD? Probably not. It may work right 9999 times out of 10,000. Instead of home builders mixing AR parts and risking off spec parts getting in the build, it's SIG getting shit components from their subcontractors overseas. The other striker safety tabs with an 89º, 91º and 92º angles have an even lower failure rate. You're only gonna get the UD when the stars align. That's how you can have a widespread problem result in isolated UD incidents.
Tolerance stacking is just the layman term for what happens when multiple manufacturers are not using the same spec. You know it's not an accurate engineering term but you understand what it means to normies.
>We would see wider, more disparate issues if everything was just mildly out of spec
Not true, though. You can see that in the AR market and how "tolerance stacking" became widespread as a term. Basically most combinations of parts are functionally OK, but they're not accurately within milspec. Depending on how widely these parts deviate from the standard you can have off spec parts that happen to function well with each other or ARs that seem to malfunction more often but not enough for the hobbyist to really care about it.
The fact that people are using 3d printed frames and lowers and they're *mostly* reliable despite being squirted plastic and finished by hand indicates that deviating from the original spec tolerances isn't immediately catastrophic.
Look at for example picrel. That striker safety tab is three degrees off. Is it gonna lead to instant UD? Probably not. It may work right 9999 times out of 10,000. Instead of home builders mixing AR parts and risking off spec parts getting in the build, it's SIG getting shit components from their subcontractors overseas. The other striker safety tabs with an 89º, 91º and 92º angles have an even lower failure rate. You're only gonna get the UD when the stars align. That's how you can have a widespread problem result in isolated UD incidents.
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