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post #1 of 8 Old 09-09-2010, 11:36 PM Thread Starter
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More vibration

My vibration problem is just the opposite of thinning a piece. My piec is 18" long 4" square cherry. The vibration was so great that I had to weld the head to the base. I have tried to turn the piece at about 650 rpm and I still get vibration. Any ideas will be appreciated.
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post #2 of 8 Old 09-10-2010, 06:16 AM
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to fast 350 rpm piece out of balance

Old wood workers never die thay just get dry rot
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post #3 of 8 Old 09-10-2010, 07:58 AM
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It's probably just a combination of a light duty lathe and too fast a speed. I don't have any trouble spinning something that size on my 700 lb powermatic but If I go to the Nova Mini (which is still a cast iron well built lathe) I can't go above 500 when it's out or round. After I get it round that lathe will spin it faster. Lesser quality lathes won't let you go anywhere near that fast. I used to chase my cast iron Delta around the room. It just wasn't a high quality lathe.
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post #4 of 8 Old 09-10-2010, 11:18 PM Thread Starter
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Thank you for the info.
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post #5 of 8 Old 09-11-2010, 10:00 AM
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Jerry,
Try cutting off the edges on a bandsaw before turning it. Should look like a long octagon. You can make a simple jig to hold the piece up on edge at 45 degrees and set the fence on the bandsaw for the proper offset. Cut, give it a quarter turn flip and do it again. Four cuts and you're done. It'll be a lot closer to round to start with and it's easier on your tools, too.
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post #6 of 8 Old 09-12-2010, 10:23 AM Thread Starter
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I saw Norm do something like you suggest on his New Yankee Workshop show. The design I was trying to get too used the full thickness of the stock mid way on the shaft. What I was thinking of doing was anchoring the machine to the concrete floor, that would only become a problem for me in the future or drawing a full scale model on a piece of hardboard and drawing it on 4 sides of the blank. Then cut it on the band saw. Do you think that would work.
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post #7 of 8 Old 09-12-2010, 07:28 PM
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Jerry,
trimming the blank up on the bandsaw with the pattern drawn on it would help. Is there any way to slow your lathe down any more below 650? Maybe get a smaller pulley for the motor and slow it down till you have the blank balanced and then speed it back up.
I don't know if I would anchor the lathe to the floor. When the lathe starts to shake, it's telling you to slow down. If you anchor it, it may just try to shake itself apart.
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post #8 of 8 Old 09-12-2010, 09:05 PM Thread Starter
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I will have to take a look at getting a smaller pulley Mike. That is a good idea.
Thank you
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