I've been at it for 35+ years.
- Vote on answer
- posted
17 years ago
I've been at it for 35+ years.
Not the chuck, just the workpiece. ;-)
But you're right. A tabletop lathe won't have a chuck big enough to roll through the wall if it comes off.
Later,
Charlie
I caught a half of a brick in the windshield thrown by a group of kids once. Luckily, it caught part of the top of the cab. We got sprayed by a little broken glass, but the brick didn't come through. If I coulda got to those kids It wouldn't have been pretty. I filled out a police report. Cops said it happens all the time.
Unlikely even the work piece since a bench top lathe likely doesn't run fast enough to launch a part well. A snapped tool bit embedded in the sheetrock is a possibility.
Pete C.
Sounds like a start to a country song...
"I got squished by a squash, Squarely on the Shoulder; You were always on my mind. Now my Pumpkin's puking pie crust all down my side, like a vegetable slip and slide ...
Hmm, don't reckon I'll give up the night job.
tschus pyotr
-- pyotr filipivich Typos, Grammos and da kind are the result of ragin hormones Fortesque Consulting: Teaching Pigs to Sing since 1968.
Okay, so I'm late and catching up, but "Robin S." wrote on Sun, 28 May 2006 14:11:18 -0400 in alt.machines.cnc :
Here, here. I'll take the time to lay out work, raw stock here, empty box for complete parts, all set so I don't have to go far once I open the door (I make small parts, a lot of times, loading the part is the longest segment of the cycle). Yeah, I'm a little slower getting started, but once that's taken care of, my cycle times shorter, and I can get it all done.
As my first boss told us all, "If you haven't time to do it right, when will you find time to do it over?"
tschus pyotr
Some kids I knew in high school went out throwing eggs from cars on Halloween once. 1:00 AM on a foggy night they threw an egg at a guy on a bike, and it hit him square in the spine without breaking on impact. Moments later they noticed that they had entered a culdesack (sp?) without noticing because of the fog, and there was no way out other than the way they came.
By the time they got to where the bicyclist had been, they were going about 70 mph, and he threw a rock slightly larger than a softball from hiding in the bushes at least 40 feet away from the road, and hit their truck square in the middle of the windshield. The whole windshield broke, of course, but the rock did not go through. I was glad that I had the sense to stay home when I was invited to attend.
Having already had your first crash, you are entitled to join the alt.machines.cnc "Frappr"
Okay, so I'm late and catching up, but "Girly" wrote on Tue, 30 May 2006 01:20:03 -0400 in alt.machines.cnc :
Sounds like one of several things possible: 1) wrong Tool Length offset (I got confused, once, and put the short value where the longer tool was. When it made a rapid move to 1 inch over the part, it thought the tool was 4 inches short than it was. Fortunately, that was still short of the tool holder and it was a 3/8 drill already spun up to speed. Fastest hole I ever drilled! I now write TLOs and CRC/CLC* down, _in order_. and then enter them.) 2) Reset button hit. The machine 'thinks' the tool is farther from the part than it is, then rapids to where it thinks is clear space. 2a) "jumping" down a program to 'pick up' where you left off, and not resuming on a 'safe" line, and the machine does what you told it, which isn't what you meant, and rapids the tool into the vice. NFG. [Not Fery Good!] 3_) rapid move vs "normal" movements. It is done before you (the carbon based control) realize it. 4) you have one co-ordinate set and you move to G28 Z0 ('rapid home')in the wrong co-ordinate system, and rather than move up, it moved down. (Missed the fixture by that much. Fortunately, I take care of bodily process before I go to work, so I don't have to worry about messing my britches. :-) ) 5) Gremlins / Menehunis / Elves, Alien Space Bats. Day Shift! When all else fails, blame day shift. Or Congress.
tschus pyotr
-- pyotr filipivich Typos, Grammos and da kind are the result of ragin hormones Fortesque Consulting: Teaching Pigs to Sing since 1968.
we were setting the offsets, and they worked fine, then they didn't... its a good test piece now...haha
Girly:
We call them "Set-up" parts, in our shop. LOL
Wow
This stuff is mind blowing to me
Out right night marish....................
Its pretty hard to crash a CNC with your eyes open.
Wow
Joe788 wrote:
Really? What's the max programmable feedrate on the machines you run? What's the rapid rate? Get one going 900 IPM or more, and you won't have time to close your eyes before the turret indexes the part right out of the chuck and destroys the safety glass you've got your nose pressed against. Damn, but that guy was glad it was a good window.
Later,
Charlie
Right Charlie, my Yang gang tool that you saw has 1,181 IPM rapid. I never have crashed it since I bought it new in 1997. But you would NOT be fast enough to stop it. I'm very careful setting it up at rapid on 25% .
Best thing about a CNC, it does exactly what you tell it to. Worst thing about a CNC, it does exactly what you tell it to.
Tom
MSI wrote:
x?}TÁnÛ0½ë+xÚZÀóîkQ`+,?nZ gY¦m²?ITïëGÊMËr0$ç?||´1æáqK"ÆæÖ?ù?i¹}ïï?÷ó3Cæ2 ?ÙǺ@?#0??¿?ä?!Öçl?ÏSûßÅ;?O?ÂdS¯]²y÷_ïañ
Ha-Ha. Maybe some day controls will look at the code & flash a warning on the screen. "your going to CRASH dumb ass".
Don't laugh too soon...
Likely it's already entirely possible to do this with parameter input limits and via laser inferometry--though appears nobody's doing this so far.
( wanna share the patent )
Why wrote in news: snipped-for-privacy@4ax.com:
Exactly the same situation on a Mazak Squirt. 1181 IPM rapid. You don't have time to even think before bad things can happen. Add in robotics..and it can get ugly in a hurry.
PolyTech Forum website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.