Sherline 4-Jaw Independent Chuck Model #1073
For Use with Older Sears 6" Lathe,
1/2"-20 Spindle Thread
4-Jaw chucks have four advantages over 3-jaw chucks.
(1) They can be used to hold irregularly shaped parts.
(2) With the use of a dial indicator, they can be used to center parts with a great deal of accuracy.
(3) Four-jaw chucks can be used to deliberately hold a part off-center.
(4) They can clamp stock tighter.
This is a valuable asset when machining cams, crankshafts, and similar parts.
The main disadvantage of the 4-jaw independent chuck is that the jaws must be individually set, adding considerable time to setups.
Like the Sherline 3-jaw chucks, the 4-jaw chucks can be used to clamp either externally or internally.
This 2.5" (63mm) 4-jaw chuck is designed to grip from 3/32" (2mm) up to 1-3/16" (30mm) diameter stock with the jaws in the normal position. For larger diameters, the jaws must be reversed, and can grip up to 2-1/4" (56mm).
The chuck has a .687" (17mm) through hole.
1073 Sherline 1/2in - 20 4-Jaw Chuck Instructions
CA Prop 65 WARNING: Drilling, sawing, sanding or machining wood products can expose you to wood dust, a substance known to the State of California to cause cancer. Avoid inhaling wood dust or use dust mask or other safeguards for personal protection.
I can do all this through him who gives me strength. Philippians 4:13