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A 4-jaw chuck accepts rectangular and circular and odd shaped parts. The 4 jaws can be adjusted individually. That permits many tricks or inventions.
For example:
1. A simple fly cutter of round stock with a small boring bar clamped excentrically to the 4 jaw chuck.
Suitable just for facing.
2. Boring, however, requires a finely adjustable ‚thing’ that can be clamped to the 4 jaw chuck.
The ‚thing’ forgoes a nice but nasty dovetail and shows the usefullness of ‚disc springs’.
Thanks for sharing - excellent drawings in the pdf as well.
Clever and fast use of a disk spring, avoiding dovetail cutting entirely for this makeshift boring head.
Coincidentally I'm into another upcoming metrology project where I'll need a zero backlash differential screw as well
(same solution as in this post: https://www.homemadetools.net/forum/...022#post134042):
Special RH thread M6 x 0,75 mm and standard RH thread M4 x 0,70 mm, will give a LH screw with a 0,05 mm pitch...
Proof-of-concept "acrylic vise":
Attachment 40209
ATB
Johan
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Thanks uv8452! We've added your Lathe Boring Using a 4-Jaw Chuck to our Machining category,
as well as to your builder page: uv8452's Homemade Tools. Your receipt:
<div id="blocks"> <div class="block b1 pngfix"> <div class="bimg"> <div> <a href="https://www.homemadetools.net/homemade-lathe-boring-using-a-4-jaw-chuck"> <img src="/uploads/250127/homemade-lathe-boring-using-a-4-jaw-chuck.jpeg"/> </a> </div> </div> <div class="head pngfix"></div> <div class="left pngfix"></div> <div class="right pngfix"></div> <div class="blockover b1 pngfix"> <div class="title"> <a href="https://www.homemadetools.net/homemade-lathe-boring-using-a-4-jaw-chuck">Lathe Boring Using a 4-Jaw Chuck</a> <span> by <a href="https://www.homemadetools.net/builder/uv8452">uv8452</a></span> </div> <div class="tags">tags: <a href='https://www.homemadetools.net/tag/jig'>jig</a>, <a href='https://www.homemadetools.net/tag/boring'>boring</a> </div> </div> </div> </div>
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Now we understand the zero-backlash:
Proof-of-concept "acrylic vise":
Attachment 40209
