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What is the "reference circle diameter" of worm (df) and same for wormgear? I am using Machinery's Handbook rev 22 to calculate strength of worm gearing and Df and df (f is subscript) are used in calculation and does not define these variables.

What process is used to cut windshield wiper blades and produce a very sharp edge?

How do I calculate the stress on ring gear? I know stress on planets and sun gear. I want to find out if 7075-T6 will work for ring gear? This is an extremely slow application and very low life is needed (a few hours at rated torque)

How can I calculate the minimum spur gear thickness in the area away from the teeth? This gear is loaded on center with the gear. I would like to thin down the gear leaving a thicker web for teeth. Dp=20 Teeth number = 19/102 (.95/5.1" dia.) Possibly 1055 heat treated material .8 hp @ 7000...

With a through hardened (Rc48) 20 degree stub spur gear running very slow and with a 2 to 10 hour life, does contact safety rating matter? Bending strength safety calculates to over 6 but contact safety is about .75 . Is this OK if some surface damage is acceptable? Hours of use and speed were...

When a pinion spur gear tooth is made thicker to increase bending strength and the mating gear is made thinner, since it is normally stronger, are special cutters needed? Does it depend on how the gears are cut? Hob, shaper... One example might be that I want the pinion tooth to be 10% thicker...

What is the going rate for gear or chaing drive design consulting? Does the rate drop for larger jobs? Tim

I need to coat steel hand tools with a colorful coating that is more durable than paint. -Bright appealing color is very desirable -Temperature range, 0 to 120 F -Weight of parts, 5 to 45 pounds -Rust protection would be nice but not required -Material is 17-4 stainless steel...