SHERLINE independent jaw 4-Jaw Chuck

SHERLINE self-centering 4-Jaw Chuck

SHERLINE 4-Jaw Chucks

The Purpose and Use of a 4-Jaw Chuck

There are two types of 4-jaw chucks: independent jaw chucks and self-centering chucks. Sherline offers both.

INDEPENDENT JAW CHUCKS...
4-jaw independent jaw chucks have four advantages over a 3-jaw chuck. 1) They can be used to hold irregular shaped parts. 2) With the use of a dial indicator, they can be used to center parts with a great deal of accuracy. 3) 4-jaw chucks can be used to deliberately hold a part off center; and 4) They can clamp stock in a tighter grip. This is a valuable asset when machining cams, crankshafts and other similar parts. The disadvantage of the 4-jaw chuck is that the jaws must be individually set, adding considerable time to bar stock setups.

Like the Sherline 3-jaw chucks, the 4-jaw chucks can be used to clamp externally or internally. The grip range (size of part that can be held in the chuck) is noted below for each chuck.

Although we recommend the purchase of the 3-jaw chuck to make the Models 4000A, 4400A or 4500A lathe easier to use for standard lathe projects, the 4-jaw chuck could be considered the accessory that could add the most versatility to your machine. However, if you have definite projects in mind where you feel the 4-jaw chuck would be more useful, or if you already own a 3-jaw chuck, the "A package" lathes may be ordered with the 4-jaw substituted for the 3-jaw upon special request.

SELF-CENTERING CHUCKS...

Self-centering chucks are designed to have all the jaws move in unison. The jaws are driven by a spiral scroll when the knurled ring is turned. Self centering chucks will never duplicate the accuracy that can be attained with jaws that are moved independently, but they will usually "get the job done", saving a machinist much time and effort. Its main purpose is to quickly center and hold square or round stock. The disadvantages are that the material must be quite accurately round or square for all four jaws to grip properly, and absolute centering accuracy cannot be achieved because the jaws cannot be individually adjusted. Sherline offers both 2.5" and 3.1" self-centering 4-jaw chucks. These are offered only in a 3/4-16 spindle thread to fit Sherline machines and are not available in metric threads for older Unimat and other brand machines. Click on the appropriate highlighted part name below to view instructions for use of either type of chuck.

Lubrication and maintenance

Clean chips from the jaw slots with a brush and add lubrication periodically to keep the chuck operating smoothly. To prevent rust, keep the surfaces of the chuck lightly oiled. If possible, store wrapped in the waxed paper it came in.

CHUCK INSTRUCTIONS

To see complete instructions on the use of any chuck, click on the highlighted part number below.

INDEPENDENT JAW 4-JAW CHUCKS...

P/N 1030 3.125" (79mm) 4-Jaw Chuck (.html version) or .pdf version

Jaw grip size ranges from 3/32" (2 mm) to 1-1/2" (38 mm) with jaws in standard position and 2-3/4" (70 mm) with jaws reversed. Hole through center is .687" (17 mm). Spindle thread is 3/4-16 for use on Sherline and similar equipment.

P/N 1035 2.5" (63 mm) 4-Jaw Chuck with 14 mm x 1 mm thread

This chuck is the same as the 1044 chuck below but is threaded 14 x 1 mm to fit the Unimat 3 or Cowells lathes

P/N 1044 2.5" (63mm) 4-Jaw Chuck (.html version) or .pdf version

Jaw grip size ranges from 3/32" (2 mm) to 1-3/16" (30 mm) with jaws in standard position and 2-1/4" (56 mm) with jaws reversed. Hole through center is .687" (17 mm). The spindle thread is 3/4-16 for use on Sherline and similar equipment.

P/N 1071 12mm x 1mm 4-Jaw Chuck (2.5" O.D.)

This chuck is the same as the P/N1044 Chuck above but is threaded 12 x 1 mm to fit the Unimat SL1000 lathe.

P/N 1073 1/2-20 4-Jaw Chuck (2.5" O.D.)

This chuck is the same as the P/N1044 Chuck above but has a 1/2-20 thread to fit older 6" Sears lathes.

SELF-CENTERING 4-JAW CHUCKS...

P/N 1075 (2.5") and 1076 (3.1") 4-Jaw Self-Centering Chuck (.html version) or .pdf version

CHUCK DIMENSIONS

To see detailed dimensions of the Sherline 4-jaw independent chucks, CLICK HERE.

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