Measuring Gears

[Flyinfool]

I need to make some gears for a project.
I have the correct cutter and have an indexing head for my mill.
I need the formula to calculate the wire size and measurement over wires.
The gears that I need are 13 and 14 tooth Module 1, metric gears.
I have searched all over the internet looking for this and have not found an answer. The closest that I found was a chart from SDP/SI but it only goes down to 18 teeth.

Or is there another way to determine if I am cutting to the correct depth with out spending major $$$ on a gear checker

Any help would be appreciated.

[HuFlungDung]

Machinery's Handbook has this information. It is too complex to relate on this forum. The old 20th edition has an actual formula, the 25th edition has a bunch of preworked tables.

[Ken_Shea]

Jeff
This may offer some help, all dutch to me though.
http://www.shopswarf.orcon.net.nz/module.html

Ken

[Kiwi]

Gears of module 1 and less than 17 teeth become undercut.
Your cutters may be ground to prevent undercutting.

These figures are for a for 20deg pressure angle and true profile.
Module 1: 13 teeth: Pin dia 1.75mm: 1 pin = 15.217mm: 2pins = 15.335.
Module 1: 14 teeth: Pin dia 1.75mm: 1 pin = 16.22mm: 2pins = 16.44.
Check with existing gear.

This site has a download program.
http://quickgear.bizland.com/index.html

[tobyaxis]

Did you try searching Gleason Works?
They produce machinery and cutters specifically for all kinds of Gears.

You can also try Fellows, Micron, Parker and Barbra Coleman.

A great source may be AGMA. This is the classification of Gears and Tolerancing Classification.(Association of Gear Manufacturing)
Started out working in a Gear House making AGMA 12's and 13's (+-.0002). After this Class Gears have to be Ground AGMA 14's and up.

The Machinery's HandBook #18 is the best for Gears. It explains about Addendums, Dedendums, and Pressure Angles. Way too much info to list in this Thread.

tobyaxis

[Flyinfool]

Thanks to all that answered.
I had started by looking in my Machinery Handbook #23 and did not find what I was looking for.

Kiwi
The link you posted worked out great.
Thanks again.