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Spindle Bar Grips
Spindle “Tommy” bars can be hard on your fingers when tightening or loosening a chuck, or removing a tool from the spindle. These molded rubber end caps give a more comfortable and secure grip. They also prevent spindle bars from rolling off your bench. Spindle bars and rubber covers can also be purchased as a pair as P/N 4059.
Related products
- For those who have jobs where speed and ease of use are more important than maximum accuracy and want a chuck that is loose right from the start (No extra charge). Add the note “loose jaws” to the comments box below
- Soft (not hardened or machined) steel jaws are also available when you build your own chuck.
- Ductile plating with columnar structure
- Harder than any other nickel-based coating
- Coating uniformity that eliminates post-plate grinding (or burnishing)
- Wear properties overall superior to hard chromium
- Hardness (68-72 Rc)
- Low coefficient of friction (.044) Teflon™ is .04
- Uniform coating thickness up to .004”
- Accepts dry film lubricants
- For those who have jobs where speed and ease of use are more important than maximum accuracy and want a chuck that is loose right from the start (No extra charge). Add the note “loose jaws” to the comments box below
- Soft (not hardened or machined) steel jaws are also available when you build your own chuck.
3.1″ 4-Jaw Chuck
This chuck combines the ease-of-use advantages of the 3-jaw chuck with some of the advantages of a 4-jaw chuck. It will automatically center square or round stock. (The stock must be accurately shaped for all four jaws to grip.) It will also grip thin-wall tubing in four places rather than three, which spreads out the load and allows more grip without crushing the tubing.
Turning the knurled portion of the outer diameter of the chuck scrolls all four jaws in unison. Included with the chuck are two Tommy bars for tightening and loosening the chuck.
Centering accuracy on self-centering chucks is to within a few thousandths of an inch. If perfect centering accuracy is required, see the section on 4-jaw independent jaw chucks.
This chuck will hold parts from 3/32" in diameter up to 1-1/2" with jaws in the normal position and up to 2-3/4" with the jaws reversed. A smaller 2.5" diameter chuck is also available.
Chucks for Sherline and Other LathesThe chuck is available in several spindle threads for use on Sherline (3/4-16) and other machines, such as old Unimat lathes (14 mm x 1 mm). *Please note that chucks with a thread size other than 3/4″ x 16 are made to order and have a lead time of 5-7 business days.
Jaw Options
3.1″ 4-Jaw Chuck – Electroless Nickel Coated
This chuck is identical to P/N 1076 except for an Electroless Nickel coating that has been applied to help prevent wear and corrosion. This special coating has been applied to all external and internal surfaces of the chuck (except for chuck jaws), significantly improving the life of the chuck. This chuck also opens and closes more smoothly due to the lubrication properties of Nickel-Teflon.
Some of our customers have been wondering how to tell the difference between our standard chucks and those that have the Electroless Nickel coating. Standard chucks have darker markings than the coated chucks (See Figure 1. Click on photo to view a larger image).
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Figure 1—Examples: (Left) 1040 3-Jaw Chuck (3.1″), (Right) 1040C Electroless Nickel Coated 3-Jaw Chuck (3.1″).[/caption]
Here, at Sherline Products, each of our chucks is laser engraved with a company mark, chuck size, and jaw location. During the laser marking process the laser removes a bit of the surface and darkens the material below (Figure 1, left). When chucks are sent out to receive the Nickel-Teflon finish the coating process changes the dark engraved markings to a noticeably lighter finish (Figure 1, right).
There is also a subtle change in the color of the chuck, but in the absence of being able to compare them side by side, the most evident way to tell whether you have a coated chuck, or not, is to check the color of the laser markings.
Spindle “Tommy” Bar
Spindle Bar Set with Grips
This set includes two spindle bars and two rubber grips. Spindle “Tommy” Bars are use to aid in the operation of opening and closing scrolling chucks.
“Tommy” bars can be hard on your fingers when tightening or loosening a chuck or removing a tool from the spindle. These molded rubber end caps (see picture below) give a more comfortable and secure grip. They also prevent spindle bars from rolling off your bench. These covers are sold separately as P/N 4058.