It is currently 29 Mar 2024, 16:59
Mike G wrote:What's the shape of the inside of the bowl?
If it follows the line of the outside, it will be sloping the wrong way, and could pull off the buttons. Start it up with a long, long broom handle from just outside the workshop door. Make sure you have your camera set to a very fast shutter speed.
Dalboy wrote:That will be fine don't over tighten the jaws and take small/light cuts and everything will be fine.
Mike G wrote:Oh that's a pity. I was hoping to see it enter low earth orbit......
Yeah, you'll be fine with that. In theory, 3 points should be enough to hold it.
Dalboy wrote:That will be fine don't over tighten the jaws and take small/light cuts and everything will be fine.
DaveL wrote:Dalboy wrote:That will be fine don't over tighten the jaws and take small/light cuts and everything will be fine.
Only extra thing I might do is bring up the tail stock with a flat centre while making the first cuts, just in case.
Sharpen your tools just before doing this, and rub the bevel to give a nice smooth cut.
Mike G wrote:Bloody hell, Andy! Are you OK?
Woodbloke wrote:Looking forward to hearing all the grisly details on Sat...I may be able to offer a solution which would have prevented that 'explosion' - Rob
Andyp wrote:Woodbloke wrote:Looking forward to hearing all the grisly details on Sat...I may be able to offer a solution which would have prevented that 'explosion' - Rob
The problem was not the bowl exploding but two of the button jaws coming off the chuck because I had wound them out too far. Even the tail stock couldn't hold it. I did check this and waggled all 4 of them before I switched on but I guess the extra centrifugal forces at speed forced them out and off.
What doesn't kill you can only make you stronger, live and learn eh?
DaveL wrote:Oh I see, the bolts do need to be tight or they will not stay put, I have used spacers under the rubber buttons to bring the grip out to the required position on the work.
Without the bolts being being tight, you stood no chance of turning the bottom of that bowl, as you say lesson learned, you won't do it again.
Deejay wrote:Morning Andy
Glad you're OK. It is a bit scary isn't it.
FWIW, 1000 r.p.m. is a bit too fast in my opinion.
I've used the same technique on small bowls. I put a sheet of kitchen towel on the jaws to stop any scratching and expand the chuck until the piece JUST stops moving within the buttons. Support it with the tailstock and take very light cuts with a sharp tool, as above. I run the lathe at very low speed until the cuts is continuous (i.e. any eccentricity has been turned off ). Turn off as much as you can and then remove the tailstock support, check the tighntess of the buttons and turn of the last bit .
With a small amount to turn off, Is it worth turning at high speed?
Better luck with the next one(s).
Cheers
Dave
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