On Wed, 17 Dec 2003 01:28:51 -0500, "Jeremy Hopkins"
wrote:
i just received a jet jml-1014 mini-lathe as an early Christmas present, i
have
noticed the pens i have turned are oval and off center. i can feel vibration
on the piece as i turn it, it seems like the shaft is off center, the hand
wheel also is rotating off center. i
have cleaned the taper, tried different mandrels, different live centers. i
do not have a dial indicator yet so i cannot say how far things are off but
i would guess around 1/16-1/32 inch on the right end of the shaft and around
1/8 inch or more on the hand wheel end. anybody have any suggestions as to
what the problem could be? i am going to call jet tomorrow morning but i am
looking for advise before i call.
Is your tailstock staying tight while you turn pens? Check to make
sure that the set screw is engaging the groove on the back side of the
quill.
Have you snugged it up to the mandrel, __but not too tight__? If you
put too much pressure on the pen mandrel, it will cause it to bow, and
make your pens go oval. You only need to tighten it up enough so it
makes the bearings in the live center engage. Also, are you using the
correct bushing for the model of pen you are turning?
To see if the tailstock is out of alignment, push the tailstock up to
the headstock and see if the pins in the drive center and the live
center line up with each other.
Finally, make sure you have the belt on the appropriate wheel, ie. the
one that is directly above and below one another, rather than crossed
over. I suppose it's possible that this could make the motor vibrate.
That's about all I can think of at the moment...give those a try. I'm
going out and turn on mine in a few minutes.
--
Chuck *#:^)
chaz3913(AT)yahoo(DOT)com
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September 11, 2001 - Never Forget
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