Poor man's bore gauge?

[Phil Yearout]

Brian, my only problem with those is that unless you want to pay a pretty good chunk the ones I've looked at say accuracy is around +/- .01. I didn't think that was good enough. Maybe I just wasn't looking at high enough quality ones?

[edgarspencer]

Originally Posted by Phil Yearout

Brian, my only problem with those is that unless you want to pay a pretty good chunk the ones I've looked at say accuracy is around +/- .01. I didn't think that was good enough. Maybe I just wasn't looking at high enough quality ones?

Are you sure about that number, Phil? Even the Chinese junque at Harbor Freight states, and is, more accurate than that.

I prefer mechanical gauges over digitals, and as Rick says, keep (a pack) of batteries handy; they eat them.
Mechanical gauges with a telltale make meaningful measurements easier. Digitals have a zero function, but when you zero, your previous measurement is lost.
When we were certifying to ISO 9001, digital gauges, on almost every measuring instrument was considered a secondary measuring tool.

[Bill Murphy]

Phil, are you sure of your measurement? .01 is one hundredth of an inch. A good machinist with a scale can identify .01. We are talking about cheap micrometers that will measure one thousandth of an inch.

[B. Dudley]

Originally Posted by Bill Murphy

Phil, are you sure of your measurement? .01 is one hundredth of an inch. A good machinist with a scale can identify .01. We are talking about cheap micrometers that will measure one thousandth of an inch.

I was wondering the same thing. I think he means .001.
In that case, that would be plenty accurate for measuring choke and bore diameter.