A FAIR OF COMPARATORS

摘要

In 1997 when I first started writing articles for this magazine, I did all my drawings on an old fashioned board with a rule and pencil. Things have changed somewhat. In 1998, I purchased a new computer at what seems like an exorbitant figure when compared to the prices today and especially when the performance and specifications are compared. What a difference in less than a decade! In those early days I came up with a basic design for a bore comparator but did not proceed to make it for a number of years. It was then dragged out of the CAD archive, (sounds posh) revamped and built. This was some two years ago and has been used regularly since. It was also realised that the general design principle could be translated to a second instrument for measuring outside dimensions. However, as noted later, after constructing the outside device, it was realised that it was not convenient to use and hence a "Mark II" was designed and built.