No matter what brand of dividing head you have, here is the technique and charts for the most commonly found 40:1 and 90:1 devices. In this video we use the Ellis Dividing Head(40:1) on our Bridgeport Mill. Charts for both 40:1 and 90:1 devices can https://bit.ly/3c8qEmd
Timestamps
0:00 Intro
2:07 Charts
3:45 Indexing
5:46 Assembly
7:47 History
8:15 Plates
9:40 Milling a Gear
Practical
The universal dividing head (also called indexing head) adds many new capabilities to a machine tool like a Bridgeport Mill, or even a drill press if it has a sufficiently large table. With some math and creative setups, the complexity of parts you can make with your conventional mill is significantly expanded.
History
Jesse Ramsden built one of the first high quality dividing engines in the 1700s to accurately divide circles for marking instruments. Even though this was created in Great Britain, it is housed in the Smithsonian. It represents one of the most critial tools for marking astronomical instruments and measuring angles. But deep in the heart of the machine is the process used to create it-hobbing. A skill carried through the centuries of mechanical inventors that we know as hobbing today.
We walk through the Ellis Dividing Head, how to use it, and as we cut an external spur gear.
See our blogposts on the Ellis Dividing head and many other Mechanical, Historical and How-To topics here; http://bit.ly/2LjzCCB
BTW Free downloadable charts are in this article, and below:
Charts: https://bit.ly/3c8qEmd
USED on eBay or at your local used machine tool dealer
A used Dividing head. Search phrases for eBay
Dividing Head Used
Dividing Head Universal
Dividing Head Mill
USED There are many manufacturers for these devices, expect high quality from some of the finest American Machine Tool Makers:
Brown & Sharpe
Kearney & Trecker
Hardinge
Cincinnati
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Products that are hard to find that just need a shout out. These are not found on Amazon. Small companies that have a good product:
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Lapping Tools for the ID of holes. I get a huge amount of value from this specific set
SET-2-TH
Cleaning all those small tapered holes and getting them to have a good finish and fit with the pin - PERFECT
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Cant go wrong with this stuff. Clean rigorously after for any sliding ways then oil.
NLGI #2 Grease
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Love this product. It was used on the cam to lock the main anvil. Makes it slide nicely where it counts and otherwise lock on a separate surface. Your operator will appreciate it.
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To learn about Lubricants for your machines
https://oilviscositychart.com
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.
https://www.instagram.com/villagehobber/
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