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General Workshop Discussion
Wood Turning - Lathes
Chasing down lathe vibrations
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<blockquote data-quote="RichardG" data-source="post: 1398579" data-attributes="member: 28491"><p>Some progress hopefully.</p><p></p><p>The motor runs quiet and smoothly on its own. The vibration also got worse at the faster speeds.</p><p></p><p>I have an engineers stethoscope so I probed round the bearings and the back one sounded noisy. So after much cursing I’ve removed the spindle and rear bearing and ordered a replacement SKF version. The bearing doesn’t feel that bad now it’s off but thought I may as well eliminate it. The cursing was Records policy of putting two grub screws on the pulley, the first to lock onto the spindle then a second one to chew up the head of the first! I guess this is a safety issue but wouldn’t a bit of loctite be OK? I had to taper a hex key slightly so I could get it started and then knock it home!</p><p></p><p>The other thing I noticed was the spindle pulley seemed to have a bit of play in it even through the grub screw was really tight. It was difficult to access in the lathe but I’m sure I could see a tiny movement between the pulley and spindle. Other jobs have now stopped play but I’ll check it out on the bench on Saturday when hopefully the new bearing is here.</p><p></p><p>The front bearing is a tapered phosphor bronze variant and appears to be in excellent condition and well lubricated.</p><p></p><p>I was given the lathe and it has been standing in a unused workshop for many years, the chisel and bare metal parts were all rusty. The rear bearing should have had a rubber bung to seal it in but this was missing so there is a chance that some damp got in.</p></blockquote><p></p>
[QUOTE="RichardG, post: 1398579, member: 28491"] Some progress hopefully. The motor runs quiet and smoothly on its own. The vibration also got worse at the faster speeds. I have an engineers stethoscope so I probed round the bearings and the back one sounded noisy. So after much cursing I’ve removed the spindle and rear bearing and ordered a replacement SKF version. The bearing doesn’t feel that bad now it’s off but thought I may as well eliminate it. The cursing was Records policy of putting two grub screws on the pulley, the first to lock onto the spindle then a second one to chew up the head of the first! I guess this is a safety issue but wouldn’t a bit of loctite be OK? I had to taper a hex key slightly so I could get it started and then knock it home! The other thing I noticed was the spindle pulley seemed to have a bit of play in it even through the grub screw was really tight. It was difficult to access in the lathe but I’m sure I could see a tiny movement between the pulley and spindle. Other jobs have now stopped play but I’ll check it out on the bench on Saturday when hopefully the new bearing is here. The front bearing is a tapered phosphor bronze variant and appears to be in excellent condition and well lubricated. I was given the lathe and it has been standing in a unused workshop for many years, the chisel and bare metal parts were all rusty. The rear bearing should have had a rubber bung to seal it in but this was missing so there is a chance that some damp got in. [/QUOTE]
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General Workshop Discussion
Wood Turning - Lathes
Chasing down lathe vibrations
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