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[4]

Four Jaw Self Centering Chuck

January Project of the Month [3]
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Rockytime

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#1
I have been toying with using ER-16 collets on my Sherline lathe unsuccessfully due to an inadequate collet holder. It was suggested I get a Beall collet holder ad use me ER-32 collets which I did. The Beall hangs so far over the bed it looks ridiculous as I have a short bed. It would be OK except that the TIR at the end of the holder was .004, possibly due to the long overhang. I am able to cause deflection by pressing lightly on the Beall, perhaps a little play in the head stock bearings. So I mounted a self centering 4-jaw chuck and checked the runout. I was amazed! TIR .002. My 3-jaw is out .004.
 

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mikey

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#2
I have been toying with using ER-16 collets on my Sherline lathe unsuccessfully due to an inadequate collet holder. It was suggested I get a Beall collet holder ad use me ER-32 collets which I did. The Beall hangs so far over the bed it looks ridiculous as I have a short bed. It would be OK except that the TIR at the end of the holder was .004, possibly due to the long overhang. I am able to cause deflection by pressing lightly on the Beall, perhaps a little play in the head stock bearings. So I mounted a self centering 4-jaw chuck and checked the runout. I was amazed! TIR .002. My 3-jaw is out .004.
Interesting. I get 0.0002" TIR with my Beall chuck but I'm using Techniks collets and a Rego-Fix nut.

I do like Sherline chucks - very low run out for what they are.
 
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