The Shop > Tools
Any idea why this lathe is chattering? Spindle bearings?
loply:
By the way the depth of cut in the video is 0.06mm, that's all it can manage, any more and I think it's dangerous (sounds like it might rip the part out).
For RPM, tried everything from about 150 with HSS up to about 800 with carbide, and everything in between. Couldn't find a sweet spot anywhere.
awemawson:
I wonder if the bearing adjustment isn't working quite as you think? If you are swinging on an 8" spanner I'd expect some noticeable friction and them running warm. Indeed in the past I've adjusted head stocks so that there is just a bit of noticeable friction, then backed them off a tad. Leave them running while having your tea, and if they are not warm when you return they are too loose. If you can't keep your hand on them they are too hot and need a slight slackening.
Crude. But it works.
philf:
Loply,
Is there a sleeve over the spindle between the inner races of the taper rollers?
If there is you might just be tightening up against the sleeve and no amount of effort on the spanner will make any difference.
Phil.
loply:
Hi Phil,
Nope, no sleeve. I know what you mean. It's just a simple bearing-spindle-bearing arrangement though.
Awemason, I am a bit perplexed as to why tightening the bearings so much isn't increasing the drag noticeably. I literally can't tighten them any more and they're only just dragging. I know the way it's built inside out though and there's nothing complicated about it. The only thing I could think is that the rear bearing is stuck on a ding on the spindle so won't move, but I gave it that much force I don't think that's likely.
Just been out and checked something, it's actually about 0.07mm up or down I can deflect the bar by, and I notice the chuck also moves - by about 0.03mm up or down.
I'll check whether the spindle nose itself can be deflected tomorrow, too late to start taking it apart now though.
DavidA:
Loply,
...Hi Phil,
Nope, no sleeve. I know what you mean. It's just a simple bearing-spindle-bearing arrangement though.
Are you quite sure about this ?
I have in front of me the machine manual for the 280 Synchro, which also has two taper roller bearings on the spindle at the chuck end of the headstock.
There does appear to be a spacer in between the two outer rings.
Dave.
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