How to Choose a Milling Gear Cutter & Buy One - Milling a Gear 3

own shop.
In this video we go through these parameters in detail so you can find an involute cutter for

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Involute Gear Cutter Chart & the Gear Cutter Size Guide:

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Use this link to find our calculators to aid in gear design and measurement:

Chapters
0:00 Intro
0:11 The Answer
0:35 Gear Cutter Chart
0:57 Gear Cutter set of 8 Compared
1:59 Disc Cutter Markings Decoded
2:38 Comparison of Disc Cutter to a Hob
3:00 Science Diagram of Cutter Nomenclature
4:01 Pressure Angle
5:14 Gear Gages and Reverse Engineering
6:07 Milling a Gear with a Bridgeport and an Ellis Dividing Head
6:33 Depth of Cut
6:57 Buying a Gear Cutter
7:55 Hob and Cutter Manufacturers
8:22 Undercut
9:09 Milling a Gear with a CNC Haas and a 5C Indexer

Depth of Cut
Use our calculator for Gear Dimensions to get all the critical dimensions for your gear
Here is the output from the calculator as an example
* Inputs
* Number of Teeth: 66
* Diametral Pitch: 16
* Pressure Angle: 14.5 degrees
* Gear Type: External

* Outputs
* OD Reference: 107.9500 mm 4.2500 in
* Pitch Diameter: 104.7750 mm 4.1250 in
* Root Diameter: 100.8062 mm 3.9688 in

* Addendum: 1.5875 mm 0.0625 in
* Dedendum: 1.9844 mm 0.0781 in
* Working Depth: 3.1750 mm 0.1250 in (Depth of cut is greater than this)
* Whole Depth: 3.5719 mm 0.1406 in (Depth of cut is EQ or less than this)
* Circular Pitch: 4.9873 mm 0.1963 in
* © 2021 Evolvent Design, 20-Mar-2022

The devil is in the details. Machineries Definitions
D = Working Depth
f = Clearance
D+f = Depth of Cut
But different manufacturers can define clearance differently. Use what is marked on the tool, if not available revert to asking the OEM or using Whole Depth

We are rooted in the internationally used standards set by AGMA. For this work we used
AGMA ANSI/AGMA 1012-G05

To check your gear when it is done, use the Measurement over Pins (Wires) calculator to make sure you have the pitch circle and tooth thickness you want.

References and Credit:
Stephen P. Radzevich, 2017, "Gear Cutting Tools - Science and Engineering", 2nd edition
CRC Press
This is a very comprehensive book and dives into the math behind gear cutting tools. A technical joy, plan on rolling up your sleeves.

Music: "Loso Solo"
Jonathon McEuen
His excellent guitar mastery is honed over many years. He wrote this just for the channel along with a few others. I am blessed to have friends with many different talents, and Jonathon definitely knows his craft which gets right to the essence of the channel. Sharing the skill & craft.

The history of gears is surprisingly interesting - the process of milling and hobbing gears plus the transmission of torque and movement all find a place here. We will open the "Secret Gear Case" to YT as well through this channel - a personal mission.

To learn about lubricants for your machines

Disclaimer:

[union]

Excellent video, my only criticism is what you refer to as the shoulder is actually the addendum.

[EverettsWorkshop]

Been reading an engineering book on gear designs, and it would seem like gear making is a seriously deep rabbit hole, lol! It is interesting to see how, as you show, the 14.5 vs 20 degree pressure angles are a generally geographic thing, but also interesting to see how each has its pros and cons. Thanks for sharing!

[charleskutrufis]

Late to the show but I'm certainly glad I ran across your channel. I have successfully cut a few gears but a rank amateur would best describe my expertise. I'm looking forward to watching and learning. Thank you for time and effort.

[TheKnacklersWorkshop]

Hello Andrew,
Excellent video, packed with lots of useful information, thank you.
Take care.
Paul, ,

[OldIronShops]

Always informative Andrew thanks for the video.

[AlmostMachining]

This is fantastic! Thank you for sharing.

[maquinasproductivass.der.l]

the pressure angle is a topic that few teachers teach in universities, unless you show to your teachers, a high brain, to get all.

[ClownWhisper]

There are like 50 different sets of gear cutters out there how do you choose the right one for the tooth size that you're looking for there's no information on that. I know how to calculate diametral pitch pressure angle as it applies to making the gear within the set that you're working with I know how to apply all the math but how do you find the proper set???

For example for my life I choose to buy a set that is a 16 diametro pitch 14.5 pressure angle there are eight cutters in that set I know how to cut any gear on my legs based on that set they are all fairly small tooth gears is they're all interactable between each other but if I wanna make something with large gear teeth for extremely high torque how do I find out that information I can't find out that information anywhere

[OfficialRGMChannel]

Hello,

Question: On some gear hob cutters, I've noticed that the cutter will display a DP such as 8-10 or 20/26. What do the numbers mean and why is it written in this method?

[ishaqbaba]

Sir how we know a gear is Module or DP system

[jayantagoswami]

OD=133
TEETH=40
DEPTH OF CUT=7mmm
which cutter should i prefer for cutting spur gear