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Tightening a 3-Jaw Chuck - Printable Version

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RE: Tightening a 3-Jaw Chuck - EdK - 01-24-2013

Good discussion. I knew I had read about a master jaw somewhere.

Ed

RE: Tightening a 3-Jaw Chuck - Mayhem - 01-24-2013

I also read about a master jaw and tried on my friends 3 jaw and found that one of the jaws did result is less run out than the others. I can't recall the amount but less is less, which can only be good Big Grin

I marked the jaw and will have to see if it is #1

RE: Tightening a 3-Jaw Chuck - PixMan - 01-24-2013

I have a Pratt-Burnerd Super Precision 3-jaw scroll chuck on my dad's lathe. I got it for $200 from a Harrison lathe distributor who had dropped it and damaged one of the top jaws.

It runs out less than .0005" no matter which of the 3 holes I use. Big Grin

RE: Tightening a 3-Jaw Chuck - Mayhem - 01-24-2013

Well I have zero run out on my 3 jaw, as I currently have to hold it in my 4 jaw!

RE: Tightening a 3-Jaw Chuck - EdK - 01-24-2013

(01-24-2013, 06:39 PM)Mayhem Wrote: Well I have zero run out on my 3 jaw, as I currently have to hold it in my 4 jaw!

Good one! Rotfl

RE: Tightening a 3-Jaw Chuck - Tony Wells - 01-24-2013

One of my 3 jaws has a socket marked with a "O" and it is considered the primary socket. it does seem to yield a better ruout than the other two. Not all chucks are so marked, but it might be worth going through and seeing if there is a consistently better result using one over the others and marking it as primary.

RE: Tightening a 3-Jaw Chuck - Sunset Machine - 01-24-2013

Heavy cuts, I tighten all three.

RE: Tightening a 3-Jaw Chuck - Highpower - 01-24-2013

(01-24-2013, 07:50 PM)Tony Wells Wrote: One of my 3 jaws has a socket marked with a "O" and it is considered the primary socket. it does seem to yield a better ruout than the other two. Not all chucks are so marked, but it might be worth going through and seeing if there is a consistently better result using one over the others and marking it as primary.

Well, I'll be...... Blink

I just went and looked at my chuck. So THAT'S what that means?
All these years and I never knew. Slaphead

[attachment=4322]

RE: Tightening a 3-Jaw Chuck - PixMan - 01-24-2013

Willie,

That poor chuck (and it's holder, the lathe) appear to have never done any serious machining. Get to it man!

Just kidding! Big Grin

RE: Tightening a 3-Jaw Chuck - Highpower - 01-24-2013

The guys that pick up my trash might argue that point Ken. Rotfl

[Image: th_SwarfDrum.jpg]

Besides, you can't see the "zero" mark on the chuck from down here. Big Grin

[Image: th_Chip_Pan.jpg]