Inspecting turbine gears in the 1940s - photo

General Electric employee inspecting turbine gears, c. 1940.

https://diqn32j8nouaz.cloudfront.net...s_fullsize.jpg


Previously:

https://www.homemadetools.net/forum/...034#post164634
https://www.homemadetools.net/forum/...760#post159742
https://www.homemadetools.net/forum/...755#post174929
https://www.homemadetools.net/forum/...221#post172704
https://www.homemadetools.net/forum/...134#post161016

Looks like kind of a fine-tooth pitch until you realize the size of the gears.

Hes gonna be there for awhile inspecting each tooth

Double-Crossed Helical Gear...

Herringbone Gear

This has been me bugging for a while...
A herringbone gear has no gap between the helices. A double-helical gear has a gap between the helices.