engineering noob here What does -.012 mean .278-.012 does

>>1128156
i have no idea, but here's a shot: machining tolerances?

>>1128156

Those are poorly done tolerances. On the rim, for example, what it means is +.000 -.012 inches.

It's saying it can't be oversized at all, but can be twelve thousands under sized.

t. mechanical engineer

>>1128156
dont play with guns if you cant engineer them, your going to hurt yourself

>>1128204
so what your saying is
max.278
min .266

You are correct op. Tolerances like that are to ensure it will go into the chamber

>>1128351
https://en.wikipedia.org/wiki/Headspace_%28firearms%29

>>1128204

Those are not poorly done, they convey the information correctly. Poorly done tolerances would be no tolerances, but we're able to understand the limitations from that drawing. They're just not using the convention that you learned and assume to be the only way of doing things.

t. mech engineer

>>1128156
You know that due to a number of issues, you really aren't going to improve the +100 year old 22lr, right? Especially by messing with the chamber.