[gingery_machines] A question - Lathe Chuck Size

 

Hi All,

In looking at 3-jaw, & 4-jaw lathe chucks one sees that the 4-jaw is often sized larger than the 3-jaw. For example, I see a small lathe is sized with a 4" 3-jaw & 5" 4-jaw or 6" 3-jaw & 8" 4-jaw.

Why is this done? Why not use a larger 3-jaw chuck save for the weight?

KInd regards,
DBN

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