On Sun, 23 Nov 2014, Kees van Eeten wrote to Roy Witt:

 KvE>>  I remember one from my own past. Engeneering drawings were to 
 KvE>> be in metrics. A hole of 6mm was needed. The designer checked 
 KvE>> the conversion table and put 6.0452 mm  as the size of the hole. 
 KvE>> In the workshop the conversion table was used again and it was 
 KvE>> found that the hole had to drilled with a size B drill.

 RW> I don't suppose that you or anyone else in Europe has ever seen a 
 RW> B drill, let alone know what size it is.

 RW> I have several in my drill indexes. They all measure 6.04mm...

 KvE>  You could read before you answer. And your assumptions are 
 KvE> wrong. Your drills are worn, they should measure 6.0452mm

perhaps his micrometer only goes to two decimal places instead of four or more?
;)

i see the same thing being run into when folks are building their own
spherometers for use in telescope mirror making... they tend to grab a cheap
micrometer or two from harbour freight or some place similar and then find they
are limited to only two decimal places when they really need at least four...

)\/(ark