[Spartan]

Welp, had at least 2 hours invested into machining this ~4" bearing hub. Went to do the final parting and the tool snagged and ripped the part right out of the chuck. Broke the tool, and ruined the part in the process.

Lessons learned:

- Make sure the compound angle is actually zeroed (it was on about 1 degree). Oooops.
- Hold more of the part in the chuck when parting. I only had about 5/8" to hold onto with the way I had the setup...certainly not ideal for parting, and I should have considered that.
- I was rushing to get it done. Don't rush.

Expensive mistakes for both me and the customer.

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[smithdoor]

Good news
At least it was not brass.

Dave

Welp, had at least 2 hours invested into machining this ~4" bearing hub. Went to do the final parting and the tool snagged and ripped the part right out of the chuck. Broke the tool, and ruined the part in the process.

Lessons learned:

- Make sure the compound angle is actually zeroed (it was on about 1 degree). Oooops.
- Hold more of the part in the chuck when parting. I only had about 5/8" to hold onto with the way I had the setup...certainly not ideal for parting, and I should have considered that.
- I was rushing to get it done. Don't rush.

Expensive mistakes for both me and the customer.

IMG_2213.jpg

IMG_2214.jpg

IMG_2215.jpg

IMG_2216.jpg

[DavidR8]

Ugh. Been there. Feel your annoyance!


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[noddybrian]

I hate it when that happens - one word of advice - stop parting off with the tool facing up - if you only part off with the tool facing down this almost never happens - I used to have similar disasters & an apprehension over parting - then I made a taller tool post to allow upside down mounting but this meant having to stop & reverse every time which on repetitive stuff gets old so now I've made a rear post - problem solved - I also like the mist coolant rather than flood as it really gets in deep grooves & blasts the chip clear.

[BillE.Dee]

OUCH !! Sorry to read about that, Spartan. A few years ago a friend of mine was working with molybdenum bars. He wasn't watching "everywhere", bumped one of the bars, "it" rolled off the table, bounced on the floor and made many more bars. LOTS of multi syllable words, huge delay and expense.
Again, sorry, but nobody got hurt.