Facing and Boring with 4-Jaw Chuck

[uv8452]

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’.

[DIYSwede]

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: Repeat Reading Gage - DIYSwede's "Cheap-O-Meter"):
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":


ATB
Johan

[DIYer]

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:

Lathe Boring Using a 4-Jaw Chuck by uv8452

tags: jig, boring

[uv8452]

Now we understand the zero-backlash:

Proof-of-concept "acrylic vise":