Jet JML-104I turn between centes adjustments?

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DK61

Member
Joined
May 8, 2013
Messages
25
Location
Virginia Beach, VA
I have been turning pens between centers and initially had no issues but recently i have noticed the blanks coming off the lathe slightly out of round. not sure if i inadvertently did something or not? if i put my 60 deg cone in the tailstock and a similar but smaller cone into the headstock and slide them together the points seem to be very slightly off. At first i was getting great results turning my pens between centers but now the alignment seems to be slightly off. is there a way to adjust the head or tailstock so the points line up? Or is there a different issue? i use TBC bushings when i can and use their TBC adapters for kits i do not have TBC bushing for. Again i did not have any issues when i started turning between centers either using TBC bushings or the adapters for regular bushing when i started about a year ago.

Just looking for some help. appreciate any help/advice i can get. thank you
 
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Look at the tips of both live and dead centers to see if any rust or CA or other material is on there cause them to not sit right in the bushings. Also make sure the Morse Tapers are clean both male and female sides. That is the start.
 
Try a test without using the bushings, just "between centers".

The alignment of headstock and tailstock should be irrelevant when the workpiece is only supported at the ends, unless one of the ends is wobbling as it rotates (which could be loose bearings in a live center, a loose tailstock quill, or if you're using bushings, one/both might be loose inside the pen tube, or as JT says there could be crud causing the bushing(s) to not sit tight against the point(s) of the centers.
 
If you would like to adjust your lathe so the centers meet again, trying shimming one of the legs or feet. If your lathe has a bed with flex, this will move the alignment of the points. I had a Laguna Revo 12/16 midi lathe that would flex. It was simply a matter of getting the legs/feet shimmed properly.
 
duncsuss said:
Try a test without using the bushings, just "between centers".

The alignment of headstock and tailstock should be irrelevant when the workpiece is only supported at the ends, unless one of the ends is wobbling as it rotates (which could be loose bearings in a live center, a loose tailstock quill, or if you're using bushings, one/both might be loose inside the pen tube, or as JT says there could be crud causing the bushing(s) to not sit tight against the point(s) of the centers.
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thank you. by test do you mean just put a pen blank between centers to see if there is any wobble? If i do have a loosse bearing in the live center is it fixable or do i need to replace the live center? appreciate the suggestiongs.
 
mdburn_em said:
If you would like to adjust your lathe so the centers meet again, trying shimming one of the legs or feet. If your lathe has a bed with flex, this will move the alignment of the points. I had a Laguna Revo 12/16 midi lathe that would flex. It was simply a matter of getting the legs/feet shimmed properly.
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Thanks. Did not think about this. will look to see if my lathe needs a shim. noticed you live in chesapeake, Va, I am in Va Beach. Appreciate the "local" support.
 
DK61 said:
thank you. by test do you mean just put a pen blank between centers to see if there is any wobble? If i do have a loosse bearing in the live center is it fixable or do i need to replace the live center? appreciate the suggestiongs.
Click to expand...

I was thinking of a pen blank with tube glued in - and the ends squared to the tube (not the outside of the blank, which might or might not be the same thing) such as with a pen mill.

(Just as you said you have been doing it between centers using bushings, but without the bushings.)

If the problem is in the live center - it might be as simple as cranking a locking ring tight, or it might require replacement bearings (which would probably tip me in the direction of buying a new live center, these days I like THIS ONE from Taylor Tools way better than the ones I've had from PennState.)
 
I would triy a 2 inch lenth with nop bushing, turn town to 2 mmm. - check for OOR, if not, then try the same with 2.5 inch, until you get to about 4 inches. That should tell you if you have any meaning misalignment or run-out with your lathe/centers. I have experienced this too. I would start with that - one of many approaches.
 
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