Spur Gear Selection Advice Needed

[johnoder]

John : He's fifty big, not five. 138/10/2 = 9.9

Thanks for the correction!

 

[EmGo]

Yes, .050 too much

Well, you gotta get backlash somehow If the Martin parts are cut on size, then spreading the centers is a normal way to get backlash. I personally like to try a little tighter but .025" will definitely work.

If the stock parts are just solid plate you could consider lightening them up more like a casting. An antique big gear would be cast with spokes ... kind of a lot of work to create but it'd look period.