chip tournament???

I've seen that mark in various writings in many languages both old and new.

Bob Jewett said:

Well, 2.25 inches is 57.15mm exactly. 57.2mm is 2 thousandths of an inch large which is still with spec. But you're right, both units should be given with sufficient accuracy.

snip

Click to expand...

It's still wrong. If you re-made your EDM go/no-go gauge today based off the 57.20mm as the nominal, rather than 57.15mm exact, the gauge would be worthless.

btw, I found the Wikipedia article. It was worse than I remembered. The metric and inch units with tolerances result in two completely different ball sizes. Something like this can easily creep into a spec, if the person doing it is not very careful (or knowledgeable on the subject), as this wikipedia illustrates.


Link: https://en.wikipedia.org/wiki/Pool_(cue_sports)

Price drop bump will drop price to 350. Plus shipping