Showing posts with label Engineering management. Show all posts
Showing posts with label Engineering management. Show all posts

Wednesday 9 October 2013

Convert Between Different Gear Pitch Types



The following are the basic formulas for convert from diametral pitch, ciurcular pitch and module pitches.

D = Diametral Pitch         C = Circular Pitch            M = Module
You Have
You Need
Rule
Formula
Diametral Pitch
Circular Pitch
Divide Pi (3.1416) by the diametral pitch
C = 3.1416 / D

Module
Divide 25.4 by the diametral pitch
M = 25.4 / D




Circular Pitch
Diametral Pitch
Divide Pi (3.1416) by the circular pitch
D = 3.1416 / C

Module
Multiply the circular pitch by 8.08505
M = C x 8.08505




Module
Diametral Pitch
Module divided by 25.4
D =  25.40 / M

Circular Pitch
Module divided by 8.08505
C = M / 8.08505





Gear Heat Treating

Gear Materials

Friday 4 October 2013

Worm Gears

Bevel / Miter Gears

Herringbone Gears

Herringbone gears resemble two helical gears that have been placed side by side. They are often referred to as "double helicals". One benefit of herringbone gears is that it helps to avoid issues related to side thrust created with the use of helical gears.




Other Topics
 

Helical Gears

 The teeth on helical gears are cut at an angle to the face of the gear. When two teeth on a helical gear system engage, the contact starts at one end of the tooth and gradually spreads as the gears rotate, until the two teeth are in full engagement.

This gradual engagement makes helical gears operate much more smoothly and quietly than spur gears. For this reason, helical gears are used in almost all car transmissions.

Because of the angle of the teeth on helical gears, they create a thrust load on the gear when they mesh. Devices that use helical gears have bearings that can support this thrust load.

One interesting thing about helical gears is that if the angles of the gear teeth are correct, they can be mounted on perpendicular shafts, adjusting the rotation angle by 90 degrees.





Other Topics

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