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On Sunday, February 17, 2019 at 11:18:05 PM UTC-5, Roger wrote:
replying to Dennis Turk, Roger wrote:
I have a Dalton Lathe 6 with a 3 jaw chuck marked "The D.E. Whiton
Co." The
number 3 Jaw has three teeth
missing. Where might i get a replacement jaw? ( Chuck is 4" dia. )

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Hello,

From what I can tell, these parts are not generally interchangeable.
I have a Dalton 7" (number 6125) and the three jaw chuck that isn't
running true (after 100 years, no surprise...) and have been looking
around for jaws or chuck to replace it. Nothing I've found fits - even
the 1.25" - 12 spindle thread seems to be bespoke. Let me know if you
find something!

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You buy a blank, unthreaded, chuck backplate and use the lathe to
thread it to fit the spindle. Then you match the front of the
backplate to the back of the new chuck.
http://www.lathes.co.uk/latheparts/page7.html

You could practice threading a pipe fitting before risking the
backplate.