Workshop- Measuring tooth thickness and pitch of a spur gear

  • Thread starter stephen
  • Start date
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Main Question or Discussion Point

Hi all!
I would like to know how, in workshop practice, one would measure the tooth thickness and pitch of a spur gear?
 

Answers and Replies

FredGarvin
Science Advisor
5,050
6
If you can reference a copy of ANSI B92.1 you will get a ton of information on spline/gear measurement techniques.

Are you referring for inspection purposes or just general measurement? If accuracy is not a major issue, an optical comparitor is the easiest way that many places will go. If accuracy is required for the acceptance of a part, then measurement over pins is used in most cases. A drawing for the gear will give data on the gear tooth geometry that will be used in inspection. I attached a portion from a drawing as a reference.
 
Last edited:
Q_Goest
Science Advisor
Homework Helper
Gold Member
2,973
39
As Fred points out, there are inspection methods for gear teeth but there are also simple identification methods. I've seen gear gauges used before, they are simply a small piece of metal with gear teeth cut into them. They generally come in sets. You take out each coupon and try to match it to a gear. The one that matches gives you the pressure angle and gear tooth size. Its not meant for inspection, but they're good for identifying a specific gear. If you want to purchase one, they cost about $40 to $120 from McMaster Carr. Type in "gear gauge" and search their catalog.
 
FredGarvin
Science Advisor
5,050
6
Ahhhh...darn it. I knew I forgot the easiest method. They are identical to the thread gauges.
 

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