go to the page above this one 


Measuring the pressure angle of a gear

What is the pressure angle?

How to measure it

Make a flat piece of plasticine to the thickness of the depth of the teeth on the gear in question. Place it on a flat surface. Roll the gear in it in a straight line.

This will produce the equivalent of a rack which matches this gear. Use a blade to cut through the center of the rack. Since one of the characterisitics of an involute gear is that when the gear is of infinite diameter, ie a rack, the edges of the teeth form straight lines and the angle of these lines to the rack is the same as the pressure angle of thee teeth. It might be necessary to use a microscope to measure this accurately.



Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s

%d bloggers like this: