When I was packing the micrometers to ship out to you I saw those documents and thought you'd get a chuckle, so I shipped them out with the tool.
I'd seen the Starrett flyer before, it was the drawing of the SKF bearing outer race that I found most curious. Note how it's just the "roughing" drawing, and it would still be finish ground. I can imagine it would be using 5mm balls when assembled. The detail in the upper right shows .0042" for finish grind on the face, probable they wanted about the same on to O.D. I can just imagine those things being spit out by the thousands on a Brown & Sharpe No.2 screw machine, or more likely, a Davenport or Acme multi-spindle.
I'll try to get a photo of the Prazision Falke and the 175-200mm Starrett micrometers and post in the for sale section soon. It's been tough to get it done while still light out.
I'd seen the Starrett flyer before, it was the drawing of the SKF bearing outer race that I found most curious. Note how it's just the "roughing" drawing, and it would still be finish ground. I can imagine it would be using 5mm balls when assembled. The detail in the upper right shows .0042" for finish grind on the face, probable they wanted about the same on to O.D. I can just imagine those things being spit out by the thousands on a Brown & Sharpe No.2 screw machine, or more likely, a Davenport or Acme multi-spindle.
I'll try to get a photo of the Prazision Falke and the 175-200mm Starrett micrometers and post in the for sale section soon. It's been tough to get it done while still light out.