I found a walnut log

 

Halved it

 Made an octagon

 

Mounted it

 

 Rounder r' up and was happily making a bowl with nice thin walls a slight recurve at the top and  what I thought were nice lines.

 

 

 

Then BANG

 

 

 

 

 

GOSH  and GOLLY

 

Well  I didn't actually  use such harsh language.

 

 

 

 

 

Here's the catch that did it

 

 

 

 

 

At about 1350 rpm you can imagine it was a dramatic instant.

Have you changed your undershorts??

Oops, that'll make you soil your britches.

Cliff, we are just glad that the only thing that broke was your bowl - have heard some nasty stories about bowls coming apart and taking fingers, arms, etc.

I'm pretty sure if it happened to me I wouldn't have said "gosh and golly", sure glad none of the flying pieces caused you harm. It's good for me (wanna be turner) to see such pics to show what can go wrong.

And I thought I was the only one could that, I had 4 pieces. the next one was 3 but I am not doing bowls anymore to get to no pieces.,

Nothing a little glue wont fix...

 

When I was 13 and in shop class I got to see one really blow up...

Our class was divided in half that day. Some of us was in the shop

class room and the others was out in the shop. I was in class. The 

room was only separated by windows. The people in class could 

watch the others doing there work. A 20" bowl split in half and one

half came through the windows into our class room and the other 

half stayed on the lathe. The machine was jumping all over the floor.

Shop teacher ran out into the shop and turned off the lathe. No one

was hurt. Sure was funny watching that machine jumping all around.

I never had one bust on me, but I had an 8" metal lathe chuck come

off a metal lathe at high speed. Again no one got hurt.

5 minutes ago, Kevin Beitz said:

Again no one got hurt.

Yeah that is a miracle.  Something like that, heavy chunk of metal.  No good can come of that. 

1 hour ago, Kevin Beitz said:

 

I never had one bust on me, but I had an 8" metal lathe chuck come

off a metal lathe at high speed. Again no one got hurt.

Not a swami but just wait we all get at least one . The thing is when it happens , just like a TS accident, it is so fast you will saying "What happened" or " i knew better than to do that".

      Yes I have had a couple and one hit my face shield . I think that was a bad bark inclusion I did not know it went all the way thru. By the way slow is better if in any doubt.

Edited January 25, 20206 yr by Gerald

How much dynamite did you use?  Looks catastrophic.  Glad there are no injuries.

I did have some rings come apart when making ring bowels.

They are so light they do no harm.

Cliff

First, I'm glad you weren't hurt! I have to ask what diameter is it? The reason is, accepted rule of thumb is rpm X diameter should be 6-9,000 rim speed depending on wood, defects, inclusions etc. Of course, a catch always has the potential for disaster as well. At 1350rpm you bowl would have had to be 6.5" diameter or less to stay in the "safe" zone, looks much larger than that.

 

Steve

 

 

Edited January 25, 20206 yr by Steve Krumanaker

On 1/25/2020 at 7:07 AM, Steve Krumanaker said:

ask what diameter is it? T

maybe 11"

 

surface  feet per minute is probably the best way to think  about  RPMs on the lathe

Diameter  X RPM X 3.14159 / 12 = sfm

Aim for some where  near 2500 SFM  or less as a general range