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Gear Head

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sparky961:
After about 3 weekends, I finished this little project.  It was my first attempt at machining something quite small and detailed, and I'm extremely happy with the results.

This is a worm drive gear head, similar to those found on guitars.  I have another project that I wanted to make this for in order to test out some theories, not to mention making some chips!

All of these parts were made on a B2229 3-in-one milling machine.  I'm finally beginning to overcome some of the machine's limitations through some forethought and creative setups.  Though I didn't take any pictures during machining, I'd be happy to explain any of the steps if anyone would like to know.

Call it cheating or being clever, but the worm is actually a section of 1/4" or 5/16" (can't recall right now) lag bolt.  I scrapped the first two that I tried because I was clamping on the threads - yes kids, there is a good reason why this is not recommended.  I had success after clamping the head in the chuck, aligning it concentric, and taking VERY LIGHT plunge cuts with a parting tool.

SolidWorks model attached

-Sparky

jamoni:
Nice!  Would the larger project be a dividing head, by any chance?

Blade:
That is cool, you could make a sweet little rotary table like that using some larger screws.

sparky961:
Since I have had a rotary table ever since I've had the mill/lathe, a dividing head has never been one of the MANY, MANY things on my wish list.

The larger project actually uses it to tension a wire in the same fashion as a guitar string is tightened with a gear head.

Not sure if this constitutes hijacking my own thread, but I'll add that if anyone can suggest a very simple way to fasten and put considerable tension on music wire, I would be most appreciative.  So far my ideas have been fairly complex to make, like this one.

Thanks, gents.

-Sparky

Blade:
The rachet pawl is similar to what you have and may not be any easier to make, the other two are simple and available comercially. Found those with a google search.

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