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Getting a Grip on Four-Jaw Lathe Chucks

How a chuck works
Parts of chuck
Enlarge Image
 
The chuck jaws attach to the jaw
slides with machine screws, allowing
the use of a wide variety of specialized
accessory jaws.

How a chuck works

A chuck consists of a body, jaw slides, and jaws, as shown right. Internal spiral gearing moves all four jaws simultaneously, keeping them equidistant from the center of the chuck body. The jaws operate with twin levers or a single key. Lever action requires either the simultaneous use of both hands, or temporarily locking the lathe spindle to adjust the chuck with one lever. Single-key chucks offer the advantage of one-hand operation without the necessity of locking the lathe spindle. One-hand tightening or loosening leaves the other hand free to control stock when mounting it or a finished piece when removing it from the chuck.


Continued on page 3:  Jaw Design

 



Comments (7)
10548385652
jglenn17515 wrote:

I just discovered the jaws on my 4 jaw chuck are not centered. How do I adjust the jaws so they close simultaniously and are centered?

1/28/2016 03:03:55 PM Report Abuse
brcollectibles wrote:

I think that oneway in Canada made the ist of these. I never did much turning till I got the oneway chuck. There is only so much you can do between centers.

1/28/2016 10:25:52 AM Report Abuse
nelsondefelixy wrote:

I have just bought a 3" 4-jaw chuck, thanks for this article a guide for a beginner like me, by the way i let a machinest make an adapter to fit on the spindle of my lathe, Nelson Defelix-Iloilo City, Philippines,12-3-15, 8:30pm

12/3/2015 06:31:02 AM Report Abuse
rwm50 wrote:

myplace i have the same unit, you need a 1" + 10 tpi thread type chuck

4/3/2013 05:31:05 PM Report Abuse
Stackman wrote:

I have a 4 Jaw chuck ordered at Busy Bee Tools for my Craftsman lathe. 3/4 X 16 TPI tread pattern.

11/27/2011 10:09:28 AM Report Abuse
mcplace wrote:

I need a 4jaw chuck for a Sears Craftsman wood lathe model# 351.217150 where can I find one. Sears says this model is obsolete any brand might as lon as the thread pattern match.Can some one help

4/23/2011 12:50:03 PM Report Abuse
helmich1 wrote:

Very informative! Metalworking 4 jaw chucks work differently, but that is another ballgame.

3/24/2011 10:38:22 AM Report Abuse

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