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I'd bet his hand is still hurting. Makes me think more about what can happen when I go to the shop.
Thanks for sharing
 
If I understand correctly, nothing touched the column, and it was simply high rpm's/centrifugal force that separated the glued joints......?

It looks like he was bringing up the rpm's on a variable speed when this occurred. 1400 rpm isn't that fast for me, but that column is massive.......would make a world of difference!

Thanks for showing us, Mark. It will serve as a reminder of what happens when we aren't paying attention......(something I need to be reminded of sometimes!)

ooc
 
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Excuse me while I go change my shorts! The whole thing didn't look properly put together. The staves came apart = bad glue up. The circular top pieces came off as well, again, bad glue up. Should have been at least a lid with a tenon for glue strength because end grain does not give a good glue joint. I would have preferred a rabbet for the staves to fit into, so there is mechanical as well as glue strength in the joint.

robo hippy
 
First, I wonder if this was staged. Second, the joinery is clearly ill fitting if the glue didn't hold on edge grain. Maybe some joints had no glue at all. Sloppy work like this is not for spinning.

Finally, I think a good safety feature for a lathe would be to have the option to be able to set the lathe to default to a low speed on each start-up when working on large diameter pieces. Obviously you wouldn't want this on small diameter work.
 
Robert Manning said:
Finally, I think a good safety feature for a lathe would be to have the option to be able to set the lathe to default to a low speed on each start-up when working on large diameter pieces. Obviously you wouldn't want this on small diameter work.
Click to expand...

That, Robert, is an EXCELLENT idea.

I have come to the habit of turning the VS speed control down to zero rpm, each and every time I stop the lathe......but, I'm only human, and I forget sometimes. There is one time where this would definitely have helped me out, even though I never turn anything as big as in the video, or as big as some of the other turners who frequent this forum........I once cracked a bowl by simply turning on the lathe. The bowl was mounted in the Mega Jumbo Jaws, and was a bit fragile from the start, since it was a thin wall. For me, that was the "turning point" in my lathe habits.......it's now a rule to always start at slow, or no RPM's....then bring up to speed.

I wish your idea were a reality for me........I hope someone, somewhere, gets this information, because it's such a great idea for turners.

Good one, Robert........😀

ooc
 
That's indeed a scary thing to happen...especially with such large pieces.

I can imagine not gluing up two of the staves, so it could be assembled and glued around a steel column, but from the way it came apart, it looks like none of the staves were glued...except maybe at the very ends. The other thing odd, is that the column appears to have already been turned round...so it held together for a while at least.
 
In the caption it says he thought it was set up for doing the rope twist. If you look at some of the other column videos they turn them at low speed the machine was setup for high speed turning. Look at the other videos it looks like the end caps are just temporarily screwed on to mount it to the lathe. I think it was just a case of not checking the setup not a fake video or poor workmanship as was mentioned the posts are probably made to take apart and installed around a post in the field.
 
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