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SAN OU 3 JAW VS. 6 JAW

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1mondo

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#1
JUST WONDERING IF ANYONE WOULD HAVE ANY INPUT ON THE 6" SAN OU CHUCKS I.E. ARE THE 6 JAW TYPES THAT MUCH BETTER re RUN OUT AFTER DISASSEMBLY, CLEANING, DEBURRING, LUBING AND REASSEMBLY?
I SAW A QUESTION POSTED ABOUT WHERE TO GET A "TRUE" TEST BAR. HYDRAULIC REPAIR FACILITIES A LOT OF THE TIME WILL HAVE OLD HYDRAULIC SHAFTS LAYING AROUND AND WOULD BE WILLING TO SELL OR MAYBE GIVE THEM AWAY. THEY COME IN VARIOUS DIAMETERS AND LENGTHS!! THEY ARE CHROME, HARD AS A DIAMOND AND STRAIGHT AS CAN BE!!
ANY INPUT AS ALWAYS WOULD BE APPRECIATED!!
THANKS
RAY P
 

Ulma Doctor

Infinitely Curious
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#2
Hi 1mondo,
i use a similar method, i have some 20mm ground and chrome shafting that i use as my test bar
the test bar indicated in at .0005""so i figured it is plenty good enough
 

benmychree

John York
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#3
Six jaw chucks are best for such as thin walled work, but just imagine having to turn all those jaws around! I doubt that there is much difference as to runout, but there is less lobed deflection when turning unsupported work.
 
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