What the fuck. Plastic will lose that .0002" tolerance if somebody farts in the same room (especially .0002 over 12 inches!). How do you even measure the location of a hole that size? If you’re trying to nail the position down to .0002 what the fuck is the cylindricity supposed to be? Atomically perfect?
I’m over here thinking about temperature changes. It will be precise within 0.0002” at the ambient temperature on whatever Wednesday at whatever time
Going by a thermal expansion calculator, if the part is steel, then a temp increase by only 20F will cause the length to increase by 0.0048”. Idk what the coefficient of expansion is for plastic, but it also has one and it’s probably going to result in variations larger than 0.0002”
What the fuck. Plastic will lose that .0002" tolerance if somebody farts in the same room (especially .0002 over 12 inches!). How do you even measure the location of a hole that size? If you’re trying to nail the position down to .0002 what the fuck is the cylindricity supposed to be? Atomically perfect?
I’m over here thinking about temperature changes. It will be precise within 0.0002” at the ambient temperature on whatever Wednesday at whatever time
Going by a thermal expansion calculator, if the part is steel, then a temp increase by only 20F will cause the length to increase by 0.0048”. Idk what the coefficient of expansion is for plastic, but it also has one and it’s probably going to result in variations larger than 0.0002”