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Posted by Bill Schwab on May 4, 2008, 8:46 am
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Jim,
>> So far, I have turned a little Al tubing, and noted that the 3-jaw chuck
>> (the only one I have used so far) was not running true.
>> Bill
>
> 3-jaw chucks don't center the work perfectly anyway, and they get
> worse as they wear. Their advantage is convenience. Use a 4-jaw for
> accuracy and also when you need to tighten the jaws hard.
> Jim Wilkins
Understood. The runout on 3-jaw chucks can be pretty large, but I am
not trying to re-chuck anything yet, just learning how to get a good
finish and getting a feel for the machine. However, this was not a dial
indicator decision: one could see the chuck wobble from across the room.
One of the pin holes was quite gritty, and my hunch is that they
install the pin by feel: bottom out and then back off a certain number
of turns, so the gritty hole ended up bottoming out early and the pin
was "long" as a result - at least that would explain what happened. I
might still have some work to do, but it is a lot happier than it was,
simply by cleaning, re-inserting, and backing off one turn at a time
until the cams worked nicely.
The 4-jaw chuck will get a workout as I learn my way around the machine.
So far, I have been getting a feel for the gears. The feed levers
were particularly stubborn. The right (numbered) lever is easy enough
to move by turning the spindle. The left (lettered) feed lever was
tougher to move. The only easy way I have found to move it is to
manually turn the feed shaft. I have not tried threading yet, so I
assume one might have to turn the screw when it is engaged.
For those who might jump in with saged advice, it is an Enco 12x36
geared head lathe.
Bill
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> (the only one I have used so far) was not running true. =A0
> Bill