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Provided parts were fitted to each other, would there be any need to measure more accurately than the 64ths divisions of a rule? Until recently the only way I would have been able to set the lengths of those axles would have been with a surface gauge and a 4R rule Just because we can buy instruments graduated to 0.001mm doesn't mean we have to (or that the measurement will be that accurate). I spent a large part of my career explaining to engineers that specifying unnecessarily tight tolerances wastes time and generates an excess of either scrap products or concession notes, adding to the co...

Posted by Tony Pratt 1 on 18/01/2021 13:40:09: 'This Old Tony' on Youtube did a video on improving a set of telescopic bore gauges, it might be useful having a look to inform your buying decision. I wouldn't personally buy this sort of thing for less than £20, it would end in tears. The Kennedy ones look OK & you can always get a refund if they are a load of rubbish but as they are mainly an industrial supplier you should be alright. Tony Here you go, I was just finding it when you posted your reply; from a couple of minutes in Bill

Unless you are looking at something like a Moore & Wright inside micrometer set 903 or similar a lot of bore gauges work on the principle of set something up to contact the bore surface and measure it. The measuring being done with a micrometer. This is how the expanding ball and cheaper telescopic types work. The ones with a clock on an extended arm can have a mechanical clock that is metric or imperial and can often be swapped to give either system as required. They are often set to zero in a micrometer and used as a comparator to get the bore to required size. The electronic one is probabl...