dusty wrote:Maybe, since I don't know how the other comparisons were performed, my own observations are to be ignored. But, I compared three heavily used tape measures, (2 Stanley and 1 unknown) and they all agree to within <1/16".
Now I only did external measurements at 48" (using the hook). Why only at 48"? Because I hardly ever measure anything over 48" where precision is necessary.
I think this is a lot of fuss over nothing unless you have money to burn on "precision measuring devices". Call me cheap and practical.
Thanks. Yeah, I agree. I am more interested from an academic curiosity standpoint. Not really looking to purchase a new tape measure at this point...just find it interesting that there can be a good bit of variation on these so it got me wondering how they print the gradations to try to get them close to being accurate. Good to know that you are seeing consistent results across 3 of them to within 1/16" which is reasonable, I think.
Here's a video on how one manufacturer makes tape measures. Since they are using a print plate, I would think it would be fairly accurate for the tape markings (with variation coming from expansion/contraction of print plate). They are only doing a visual inspection at the end, but that should be good enough for 1/16" over the entire length accuracy, I would hope.