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Thread: Lathe chuck sizing
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4th July 2018, 10:40 PM #1Most Valued Member
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Lathe chuck sizing
Hi all,
I have a universal divding head with various pieces missing/damaged. I'm keen to bring it up to speed (to some extent) since it came with my mill. I has a Pratt (England) 3 jaw chuck with a set of outward facing jaws. I'm keen to find a corresponding set of inward (standard) facing jaws. The question is, how do I know what to look for? Maybe a stupid question but how are chucks measured? My lathe has a 150mm 3 jaw and a 200mm 4 jaw which I have always assumed is measured across it's diameter however this Pratt chuck measures 190mm across which seems a strange size. It's definately imperial.
Thete are numerous S/H chuck jaws on offer on eBay but how would you know what fits? Is there an easy way to determine what size chuck jaws that I am yet to learn?
Cheers,
Simon
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