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Faceplate or Independent Chuck?

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JasonB	24/10/2017 13:24:57
25215 forum posts 3105 photos 1 articles	Please reply to the question about ER blocks in this new thread rather than let this one drift.
Neil Wyatt	24/10/2017 15:00:40
19226 forum posts 749 photos 86 articles	Posted by Nigel B on 24/10/2017 07:35:34: If you accept the 'minimum two threads engaged' rule I work to the " jaws fully engaged in the body with no overhang" rule wherever possible - "two threads engaged" is a new one on me & way outside my comfort zone. How would your capacity calculations work out for full jaw engagement, Neil ? Nigel B 6" chuck internal capacity 2" 5" chuck internal capacity 1" 4" chuck internal capacity 1 1/4" Looking at a Bison user manual their 125 and 140mm (5" and nearly 6" chucks both have the same internal capacities of 50mm internal and 125 external (2" - 5". This is regardless of centre hight, which is interesting. The 160mm has external capacity or 160mm but the jaws would definitely hit the bed of a 3 1/2" lathe if you tried that. Clearly some chucks can be extended further than other (the 125 and 160 clearly are both designed to have the jaws sticking out by the length of the first step). So the 'best' chuck for your lathe, if capacity matters most, is presumably going to depend on the design of the jaw securing screws more than it does on chuck diameter. For a 100mm chuck they give 33mm internal and just 83mm external. If you are ever going to use the 4-jaw to hold irregular or offset work the idea of keeping the jaws inside the outer diameter of the chuck is patent nonsense.

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