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becksmachine
10-22-2013, 04:15 PM
Thought maybe the folks here would enjoy this!

There must be a lot of money in mining gold! :)

Dave

http://www.motioncontroltips.com/2013/10/18/rexnord-manufactures-largest-falk-ring-gear-weight-horsepower/

John Stevenson
10-22-2013, 04:26 PM
Seeing as they don't quote the helical angle I'm guessing 3/4 DP for tooth form.

Weekend_Scientist
10-22-2013, 04:58 PM
Dang! Just look at that big toothy grin! :-P

mc_n_g
10-22-2013, 06:24 PM
A couple of years ago I made one like that on my Sherline but just a few inches shorter!
;)
The tolerance is impressive because they had to maintain set temps for measuring so it wouldn't heat up too much.

bob_s
10-22-2013, 06:49 PM
Isn't. Pd = number of teeth/ pitch diameter

Number teeth = 344

Pitch diameter approximately = 522-3.4= 518.6

Pd = 0.6633

Paul Alciatore
10-23-2013, 02:25 AM
Oops, there's only 343 teeth. Back to the drawing board.