Difference between Full Depth and Stub Involute (20¦)

[homebrewdude]

I am looking at some data for an existing gear we are using.

It is defined as a standard Stub Tooth gear.
(it currently mates with another stub tooth gear)

Is "stub tooth" considered a standard gear type?
Is the 'stub tooth" utilized to reduce wear on high loads?
Reduce wear due to gear alignment issues (lack of)

I would like to utilize this same gear in a new design using a rack.

Would I specify the rack teeth as "stub tooth" also?

any suggestions?

thanks

 

[diamondjim]

Stub teeth are a standard tooth form
and have shorter addendums and dedendums
than the full depth gear teeth.
If you have enough contact ratio, stub
teeth may be specified. They are stonger
but you do lose contact ratio.
There are two standard stub forms.
The American Standard Stub
and also the Fellows Stub which
has two numbers representing them.
The first number is the actual diametral
pitch and the second number determines
the addendum and dedendum ratios.