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Here's what I used to work on when gainfully employed for over 30 years.
When I worked on the assembly floor bringing machines to life, in other words starting up a machine that had been finish assembled and ready to do it's job. You wold go down a list of instructions to check everything out, check that it was with in specs and make sure the oiling system worked and so forth. I worked on the smallest gear cutting machine made at that time. It was called a 102 gear generator. There where two kinds. Once cut straight bevel gears and the other could cut a generated gear, such as goes into the rear end of a car. These small gear cutting machines were originally designed to cut the gears on the Singer Sewing Machines. A later model cut hypoid gears such as the picture below.
This was a gear made for some JA (Junior Achievement) project. Two of these tiny ring gears were glued on ends of pieces of wood that had a coil spring in the center to hold envelops. I still have the one gear. The diameter of this gear is 13/16" Dia.
Here's a comparison with some known objects.
Here's a link to a machine seller that shows some of the machines produced by the company I worked for. I pretty much have run all those machines at least once during my employment.
https://www.machinetools.com/en/for-...ear-generators
I'd love to get a desk top Barber Coleman such as this one to hob helical gears like those that were used on the original Hobbytown drives.
So much for a lesson on gear cutting machines.
Bernd
When I worked on the assembly floor bringing machines to life, in other words starting up a machine that had been finish assembled and ready to do it's job. You wold go down a list of instructions to check everything out, check that it was with in specs and make sure the oiling system worked and so forth. I worked on the smallest gear cutting machine made at that time. It was called a 102 gear generator. There where two kinds. Once cut straight bevel gears and the other could cut a generated gear, such as goes into the rear end of a car. These small gear cutting machines were originally designed to cut the gears on the Singer Sewing Machines. A later model cut hypoid gears such as the picture below.
This was a gear made for some JA (Junior Achievement) project. Two of these tiny ring gears were glued on ends of pieces of wood that had a coil spring in the center to hold envelops. I still have the one gear. The diameter of this gear is 13/16" Dia.
Here's a comparison with some known objects.
Here's a link to a machine seller that shows some of the machines produced by the company I worked for. I pretty much have run all those machines at least once during my employment.
https://www.machinetools.com/en/for-...ear-generators
I'd love to get a desk top Barber Coleman such as this one to hob helical gears like those that were used on the original Hobbytown drives.
So much for a lesson on gear cutting machines.
Bernd
How small can ya go? 
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