All Replies on Segment Bowl Explosion

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View John Choponis's profile

Segment Bowl Explosion

by John Choponis
posted 01-09-2013 01:58 AM

16 replies so far

View TCCcabinetmaker's profile


930 posts in 1931 days

#1 posted 01-09-2013 02:02 AM

my guess woulod be a glue joint failure. Maybe something to do with the heat from sanding? Just guessing, but usually when glued pieces fail on the lathe it has something to do with either the wood itself, or the glue.

-- The mark of a good carpenter is not how few mistakes he makes, but rather how well he fixes them.

View Jimbo4's profile


1493 posts in 2340 days

#2 posted 01-09-2013 03:16 AM

What was the RPM while sanding ? I found out the hard way not to exceed 500rpm while sanding – heat buildup will delaminate the glue.

-- BOVILEXIA: The urge to moo at cows from a moving vehicle.

View tamboti's profile


207 posts in 2718 days

#3 posted 01-09-2013 04:59 AM

Glue joint failure, seems from the pictures there is a lot of end grain joints,not good if not sized before glue up. Speed should be 500 or less. You do not say with what grit you were sanding/ The lower the grits more heat and if you were trying to remove tool marks you applied to much pressure. Regards Tamboiti

-- Africa is not for sissies

View rance's profile


4251 posts in 2737 days

#4 posted 01-09-2013 05:17 AM

John, anything I could add would be pure speculation. Please tell us more about RPM’s, glue type, glue process, etc. The more we know, the better we can hypothosize.

-- Backer boards, stop blocks, build oversized, and never buy a hand plane--

View AddeCrom's profile


9 posts in 1579 days

#5 posted 01-09-2013 11:37 AM

John, thank God you’re not hit.
The exact cause is not clear, may be the use of old wood glue, not enough glue, not waited long enough??
Try it for yourself to analyze!

View Knothead62's profile


2581 posts in 2538 days

#6 posted 01-09-2013 06:42 PM

Glad you are OK. I find myself standing off to the side when turning.

View Marcus's profile


1160 posts in 1596 days

#7 posted 01-09-2013 06:47 PM

Yikes. Images like this terrify and have kept me away from lathes to this point. Glad the walls and ceiling took the brunt of the hits and not you.

View MonteCristo's profile


2098 posts in 1765 days

#8 posted 01-09-2013 07:31 PM

My guess is also higher RPMs during sanding, combined with a joint(s) that was ready to let go. It’s happened to me too.

-- Dwight - "Free legal advice available - contact Dewey, Cheetam & Howe""

View SCOTSMAN's profile


5839 posts in 3162 days

#9 posted 01-09-2013 07:35 PM

I nearly lost my thumb when a piece I was sanding after it was turned exploded and whacked right down on my thumb .Ten days in hospital and two operations later all is well but it also took a while for me to work up the nerve to turn again.It is worth it though don’t give up.Just be extra careful. Alistair

-- excuse my typing as I have a form of parkinsons disease

View Kreegan's profile


1452 posts in 1723 days

#10 posted 01-09-2013 07:41 PM

That’s a strong argument in favor of those lathes that have a cage that comes down over the work. If a piece exploded like that on my lathe, I’d have glass raining down on me when it hit the fluorescent lights on the ceiling. Glad you’re ok.

View John Choponis's profile

John Choponis

120 posts in 2270 days

#11 posted 01-10-2013 01:25 AM

Sanding speed was 550-600 rpm. This was glued up as a traditional cutting board, left to dry for a week, cut into angle strips on the table saw and then glued back together, dried for another week, then cut into rings on the scroll saw then glued the rings together. After all of this the bowl set for another month before I got back to it. Tight Bond II is the glue I use.

View ldl's profile


1135 posts in 1942 days

#12 posted 01-10-2013 02:41 AM

Sometimes things just happen with no explanation. Maybe all the cutting and reglueing was a factor.

-- Dewayne in Bainbridge, Ga. - - No one can make you mad. Only you decide when you get mad - -

View Monte Pittman's profile

Monte Pittman

23549 posts in 1915 days

#13 posted 01-10-2013 04:11 AM

Glad you’re not hurt. Always a scary situation.

-- Mother Nature created it, I just assemble it.

View Brandon's profile


4151 posts in 2528 days

#14 posted 01-10-2013 04:23 AM

glad you’re safe! I still think you should finish it, it has a very cool look to it in its broken stage.

-- "hold fast to that which is good"

View rance's profile


4251 posts in 2737 days

#15 posted 01-10-2013 06:12 AM

My guess would be internal wood stress. I’m guessing that less time sitting may have made a difference.

-- Backer boards, stop blocks, build oversized, and never buy a hand plane--

View Marcus's profile


1160 posts in 1596 days

#16 posted 01-10-2013 01:09 PM

Brandon has a point, it actually is a very cool piece as a little candy dish. I could see not wanting to go back to it after it failed like that. I would guess its about as fail proof as can be now though.

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