The Three-Jaw Chuck - 5: Removing and Replacing Jaws
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WARNING: Machine tools present a safety hazard. Improper operation can result in severe injury. These topics are for non-laboratory study only and are not to be used in conjunction with the operation of any tool or machine described herein. Never use a machine tool without the supervision of a qualified instructor.
It may be nessecary to change chuck jaws from time to time. This procedure explains how:

Back each jaw out of the slots and note the order they were removed. Each jaw and jaw slot is numbered. This tells you which jaw goes into which slot but it does not tell you in which order they were disassembled. Some chucks disassemble 1,2,3 and reassemble 3,2,1. Other chucks reverse this. Note that after removing the jaws the pattern of teeth is different for each one. This should fortify what you just read about jaw numbers and order. Never put a jaw back in the wrong slot! and always put them back in the right order!

If the first jaw to be reassembled is jaw #1 then locate slot #1, turn the scroll until the scroll thread enters the slot #3 and then back it out until it is not visible.

Continuing with the assumption that jaw #1 is the first to be assembled, drop the jaw into slot #1 and turn the scroll until the scroll thread engages. Wiggle the jaw in and out until you are sure the scroll is engaged.

Repeat the steps for Jaws #2, and #3 in slots #2 and #3. Note the end of this video. It shows the slot number stamped into the chuck next to the appropriate slot and the jaw number stamped into the jaw.

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label: three jaw chuck advaantages, disadvantages, mounting, replace jaws, soft jaws, mounting styles