Posted by Mike(NEOhio) on November 27, 2018 at 09:39:11 from (75.88.58.118):
In Reply to: gears posted by Ellis Kinney on November 27, 2018 at 07:57:38:
If you can, look at some unworn gears and get used to what the curvature of the tooth should be. Most are an involute curve with either 14-1/2 or 20 degree pressure angle. The 20 degree makes a slightly thicker and stronger tooth but the backlash increases more with wear. I look at the central area of the tooth face and compare it to the tips and roots of the tooth. With a little practice you can usually see the wear pattern there. If one gear is narrower than the other you can see the original tooth form on the wider one. You can draw an involute with a pencil and string. Tie the string to the pencil and wrap it around a can or something similar. With the pencil against the can, unwrap the string and it will draw a spiral. The first little bit of the spiral is the tooth form.
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