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David41616 David41616 is offline
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Default How big should a lathe chuck guard be?

Swing does not really have much to do with the issue.

Using the largest chuck, back out the jaws until they have about half
engagement in the scroll or worm and measure that. I would go about 2"
bigger diameter than that for a 1" clearance in the worst case when
holding a large diameter. That measurement may be pretty close to the
face plate diameter.

Personally those splash guards are more trouble then they are worth
unless you are doing a lot of production turning with flood coolant.
But each to his own.