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Index plate for dividing head

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Published on February 5, 2011

Description

This is an index plate for a dividing head en.wikipedia.org/wiki/Indexing_head, used with subtractive processes on milling machines or lathes. I wanted to see if I could make a plate with different combinations of holes than were available, but still need to check the dimensions of the center hole and total diameter for compatibility.

The rings of holes are primes (13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 52). You can use a geared mechanism to divide a circle into any number of parts. For example, making a N-tooth gear, or cutting M faces on a solid. For an idea of how they work, see atmpage.org/contrib/JSAPP/divide/divhead.html or gearcutting.blogspot.com/2008/02/dividing-head-settings.html.

I haven't published the source file (yet) because I ended up doing this in a way that seems really crude. Once I figure out how to loop the right way the code will be a lot cleaner and easier to understand.

This is the first step in building a simple dividing head.

Instructions

Just a flat cylindrical plate that mounts on an arbor.
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The plate is used with pin type insert to allow you to rotate a part to a specific angle. The plate is mounted to the shaft of the lathe (rear). A spring loaded pin is inserted into a hole in the plate. Machining takes place. Next the plate is rotated (example 30 degrees) and the pin is inserted in the hole. Machining happens and then the process is repeated.....

I have to admit I do not know what this thing does. But mounted on a motor and combined with a strobe light it would be a great method to teach kids about the stroboscopic effect and why rotor blades and spokes seem to stop when they reach a certain speed.

So I think it's a cool thing, without knowing what it is meant to do :)

greetings from germany

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