1/100mm? Thought we weren't keen on base-ten flummery.Or, put another way, trying to perfectly mate the underside of a 12 foot fabrication to a 6 foot wedge machined from a solid billet to within 1/100mm... twice!
0.0003 inch, or 4 tenths, much more imperial. Pretty tight tolerance on a 1/2 in ground shaft let alone over 6ft. Can imagine temperature variations caused that 6ft lump to expand and contract well beyond that.
Talking of thous, I once had to show a young apprentice lad what a thou was, so I set up the anvils of a mike to 0.001, held it up to the daylight and said "thats one thou, how many of those do you think there are in an inch?" After pondering the question for a while he replied with "there must be millions"