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Thread: Three or Four jaw self centering

  1. #1
    Join Date
    Feb 2009
    Location
    LaPorte County, Northwest Indiana
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    1,003

    Default Three or Four jaw self centering

    I do not have a three jaw chuck for my old SB 9", but... I have a four jaw independant and a four jaw self centering. Niether are world class, but they both work well. Any real reason to purchase a three jaw chuck? Any advantage (or disadvantage) of having three verses four with self centering feature?

    THX

  2. #2
    Join Date
    Mar 2009
    Location
    Sweden
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    145

    Default

    Easier to hold hex stock and other shapes dividable by 3?

  3. #3
    Join Date
    Dec 2002
    Location
    Friesland, Netherlands
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    1,851

    Default

    Only reasons I can think of ar ethat 3 jaws will always grip, whereas a 4 jaw might be tight on 2 jaws, loose on 2 others. If yours grips round bar ok, then don't worry.

    Also, 3 jaws will hold hex bar, nuts etc - but for the number of times you probably need that, use the independant chuck.
    Ian
    All of the gear, no idea...

  4. #4
    airsmith282 Guest

    Default

    i have only the 3 jaw and i do like it but 4 jaw as it advantages for both the indepentdent and self centering, the 3 jaw chucks are good for round triangle and hex but thats about all they are good for..

  5. #5
    Join Date
    Feb 2009
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    LaPorte County, Northwest Indiana
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    Default

    Have never needed to chuck up a hex shape yet, but hadn't though about that aspect. So far though, it doesn't seem justify a three jaw for me.

    The four jaw seems to hold a round just fine.

  6. #6
    Join Date
    Aug 2009
    Location
    Canada, Bc
    Posts
    7,650

    Default

    garagemark: stick with the 4 jaw, if you have a mill you could make some 60 degree 'v' blocks to hold hex in it without maring the corners.

    Maybe put a 3 jaw on the 'buy if I find a good one for cheap somewhere' list.

    Never seen a 4 jaw self centering, must be kinda nice.

  7. #7
    Join Date
    Sep 2009
    Posts
    262

    Default

    My independent 4 jaw has not left the lathe since they got married. I suppose I might take it off if I had to do a bunch of hex, but for one or two, probably just use the 3 jaw on the RT and make a round nipple on the hex to grab with the 4 jaw. Indy 4 takes seconds to reach the accuracy of a three jaw, seconds more to get almost no runout.

  8. #8

    Default

    Many years ago, when I was learning the machine trade, the lathe I had to work with only had a 4 jaw independant. I believe that was a good thing, because I didn't know any better and I got very comfortable with chucking up most anything with it. Now that I am retired, I have a small 13X36 lathe here at home and I have both the 3 and 4 jaw. However, my favorite is and will always be the independant 4 jaw. I have heard of the self centering 4 jaw, but don't believe I'd ever have the need for one.

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