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Photos of bad Crashes

Vancbiker

Diamond
Joined
Jan 5, 2014
Location
Vancouver, WA. USA
No picture, but had to repair a Mori AL-2 that you could not open the door because the chuck was wedged up against it. Crash broke all but one of the bolts holding the headstock to the bed. It's what happens when you try to face the end of a 6" diameter steel slug ~14" long on an 6000 rpm 8" chuck machine using softjaws and forget to put a G50 in to limit the spindle speed.
 

Beam Junkie

Plastic
Joined
Feb 9, 2015
I don't have any pics to post, yet. But it's early, and I should have something by 9:00 AM, 10:00 at the latest.
 

gorrilla

Stainless
Joined
May 2, 2007
Location
Central Texas, West and North of Austin
Just ran across this photo, WTF!!


View attachment 150331

No pics, as it occurred long ago in a shop I used to work in, to the previous operator. SL-7 Mori Seiki lathe, knocked the entire chuck off. 21" SMW air chuck. Lathe was located just outside the office of the shop supervisor. I bet that got him on the floor in a hurry, if he wasn't already. Crew said it sounded like it was coming through the wall.
I had a similar experience. Older Fanuc control, same machine. You had to load a "Home" location into the program, to tell the machine where to go to change tools. You had to remember it was a negative Z number. Positive Z took it TOWARD the chuck, not away. Luckily, I was single blocking a setup, saw it take off, hit E stop before it did much. Got one tee nut knocked off the chuck. Plus my underwear took a beating.
 

DMF_TomB

Diamond
Joined
Dec 13, 2008
Location
Rochester, NY, USA
broke tool

not exactly a crash but a long drill that broke and went flying through monitor of machine next to it. long drill caught on tool changer door.
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luckily nobody was standing in front of monitor at the time
 

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DMF_TomB

Diamond
Joined
Dec 13, 2008
Location
Rochester, NY, USA
Well that made me cringe. But... does that strike anybody else as quite a fragile connection for such a crucial machine element? Especially for (what looks like) a Mori?
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many a manual lathe in back gear if tool runs into chuck severe damage can occur even breaking loose head stock connection to lathe bed. even if lead screw shear pin shears parts can jam against one another and heavy part moving inertia can be extremely powerful
 

JustAbout

Aluminum
Joined
Apr 30, 2015
So we had a "programmer/setup" person do this to our brand new ST-30 within the first month of getting it into our shop.
photo.jpg
Needless to say that was a fun day.

JustAbout
 

JustAbout

Aluminum
Joined
Apr 30, 2015
Scroll chuck in a turning centre?

Probably would have ended up that way sooner or later regardless...

Actually no. We use a scroll chuck due our parts being aluminum and usually under 1" thick with an OD anywhere from 3" to 10" in OD size. Sometimes as thin as .250". A standard hydraulic chuck would either crush our parts or never keep it in the jaws with such a light PSI needed. When things are properly taken care of the chucks will last a long time.

5% Rapid Is for pussies!!!

Unfortunately it wasn't a rapid issue. This happened due to the setup person not tightening the part sufficiently and as the part came out of the jaws it sucked the tool holder into the soft jaws.

JustAbout
 








 
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