Telescopic bore gauges

[Kiwi BlokeParticipant @kiwibloke62605]

Just being pedantic: repeatability isn't the same as accuracy. How do people describing their technique know that they have got 'good' measurements, i.e. accurate? Really, you need to test your gauges and technique on a range of different-sized standards.

The informative and hilarious 'This Old Tony' has recently put up a video on You Tube showing how to turn a sow's ear into something better by very simple fettling.

[ChrisBParticipant @chrisb35596]

Posted by Kiwi Bloke on 18/04/2020 11:58:15:

Just being pedantic: repeatability isn't the same as accuracy. How do people describing their technique know that they have got 'good' measurements, i.e. accurate? Really, you need to test your gauges and technique on a range of different-sized standard

For a set of bore gauges I believe accuracy cannot be gauged as you're not really measuring. You can only grade the repeatability of the dimension you're taking. The accuracy will come out of the micrometer you use after taking the measurement off the bore gauge…right?

[John HaineParticipant @johnhaine32865]

Years back I got a Starrett at my favourite market tool stall, measures up to 20mm, very nice. Then at an exhibition I was looking for a wider range set, found a really tatty, cracked blue plastic wallet on a surplus stall, had a nearly complete set of Mitutoyo gauges at 25 quid! Worth digging around whenever we might have another show…

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