Vibrating lathe

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tbinggeli
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Joined: Tue Sep 08, 2009 11:44 pm

Post by tbinggeli »

greitz wrote:If you push against the end grain with the back end of the tool handle, does it vibrate? It shouldn't. If it does, then something's wrong with the way the wood's inserted into the chuck, the way the chuck is attached to the spindle, or the spindle is slipping on its teeth somehow.

What chisel are you using? If you're trying to hollow end grain with the same roughing gouge you use to round the outside, I don't think it's "pointy" enough to hollow without catching the tool's "wings". Try a smaller spindle gouge, preferably with a fingernail grind. Or another tool specifically meant for hollowing.

A picture of your chisel and setup might help.

Gary
If I push against the end grain it does not vibrate, only when scraping or touching the sides.

I will get some pics posted when I get home from work.
roy_okc
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Post by roy_okc »

tbinggeli wrote:There is no play wiggling toward or away from the headstock, just side to side and up and down.
Do you have play between the chuck and adapter?

I experienced the same problem as you with my PSI chuck and adapter. Replacing the single bearing quill with double bearing helped a bit, but the biggest problem turned out to be excess play between adapter and chuck. I got rid of most of the vibration by putting a 1" rubber washer on the adapter and also wrapping several turns of teflon tape around the threads. Still not perfect, but far better than it was.

Roy
tbinggeli
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Posts: 11
Joined: Tue Sep 08, 2009 11:44 pm

Post by tbinggeli »

roy_okc wrote:Do you have play between the chuck and adapter?

I experienced the same problem as you with my PSI chuck and adapter. Replacing the single bearing quill with double bearing helped a bit, but the biggest problem turned out to be excess play between adapter and chuck. I got rid of most of the vibration by putting a 1" rubber washer on the adapter and also wrapping several turns of teflon tape around the threads. Still not perfect, but far better than it was.

Roy

There is no play between the chuck and adapter. I have that cranked down tightly and there is the locking nut on the side of the chuck that hold it firmly in place. I will double check this when I get home though. I think it may be the play in a single bearing quill vs. the double bearing quill.

This dang thing is costing me a fortune... one thing after another. Oh well, it gives me something to do.:)
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mickyd
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Post by mickyd »

tbinggeli wrote:There is no play between the chuck and adapter. ......I think it may be the play in a single bearing quill vs. the double bearing quill.
I would doubt that it is an issue with a single vs. double bearing quill assuming the bearing(s) are in good shape. It easy enough to inspect the bearing(s) following the sawdust session in my previous post. (assuming you don't have issues getting the set screw backed off). Since your getting quill movement when wiggling the quill from the front of the machine to the back, and NOT when moving toward / away from the headstock, it's the best place to start since you confident your setup and locks are in order.

Quill is simple and bearing(s) cheap. You don't even need special tools to replace.
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Mike
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