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Spindles not round

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Forum topic by hobbsj posted 05-08-2013 01:17 PM 528 views 0 times favorited 7 replies Add to Favorites Watch
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hobbsj

10 posts in 1037 days


05-08-2013 01:17 PM

I have a jet 1014vS that I’ve used for the past couple of years. Its had periods of heavy use and periods where its just sat there for a few months. I got on it to make some rolling pins and noticed that my spindles were not coming out round, but have a bit of an “edge,” for lack of a better word, that runs up and down a good portion of the body. I don’t know what could be causing it. Basically, I just turned it between centers, put some 50 grit sandpaper on a piece of plywood to help get a long length the same diameter and noticed the board kinda hopping. I’m not very mechanically inclined so I don’t know where to start looking for the problem. Any help is appreciated. And before a smart-a says it, I did turn the blank down to a cylinder with a roughing gouge so the edges are not because I have a square mounted :-)


7 replies so far

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Kreegan

1452 posts in 893 days


#1 posted 05-08-2013 01:29 PM

Is your spindle running true? Run it with nothing mounted and see if there’s a noticeable wobble. Check the alignment of the headstock and tailstock. Put centers in both and bring the tailstock up till they’re almost touching to see if they are aligned properly. Those would be the 2 most likely culprits.

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Rick M.

4487 posts in 1126 days


#2 posted 05-08-2013 07:47 PM

It would have to be running off center so I agree with Keegan, see if the centers align.

-- http://thewoodknack.blogspot.com/

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hobbsj

10 posts in 1037 days


#3 posted 05-08-2013 08:02 PM

I just checked. The live center and the point of the spur on the drive side align perfectly. And I didn’t see any wobble in the drive center. I re-roughed out the pin and there was still some flat spots when I sanded it. But, not as bad. Could to much pressure with the sand-papered board I’m using be causing an issue? Or to much pressure on the tail-stock causing some flex in the piece and therefore some distortion?

Thanks.

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PurpLev

8476 posts in 2395 days


#4 posted 05-08-2013 08:12 PM

I have to admit, I’m not quite certain what is the side effect here – is your spindle coming out oval instead of round? or are you having some true-flat areas in the round spindle?

to each end result there is usually a known cause – for example, if your tailstock and spur drive weren’t in line you would end up having a tapered spindle (which doesn’t sound like is what you are getting).

-- ㊍ When in doubt - There is no doubt - Go the safer route.

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Kreegan

1452 posts in 893 days


#5 posted 05-08-2013 08:14 PM

What kind of wood were you turning? I’ve had some kinds of wood, particularly butternut, sand unevenly because it seems as though certain parts are softer than others. Is the grain parallel to the lathe axis or off center any? You could be hitting different grain direction.

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Rick M.

4487 posts in 1126 days


#6 posted 05-08-2013 08:52 PM

Check the tailend of your turning and see if the center hole wallowed out. If the tail center wanders, the turning won’t be round.

-- http://thewoodknack.blogspot.com/

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hobbsj

10 posts in 1037 days


#7 posted 05-09-2013 11:35 AM

The piece isn’t oval, just has some sections that have a bump. Its a laminated blank of cherry, maple and walnut. I think Rick may have hit it. After re-doing it with slightly different results, I think that I put a bit of excess downward pressure when sanding and moved the tail-end a bit. And that likely explain why the defects are closer to the tail-stock and only emerge after sanding. Thanks guys for the tips as I’ll be sure to keep them in mind for future works. I’m just glad it wasn’t the bearing going out or something that would cost $$$.

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