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03-24-2005, 07:09 PM
| #1 |
| Rock Crawler Join Date: Dec 2004 Location: Land of the Free, because of the Brave
Posts: 896
|  CNC mistakes...what's your worst? I just had a good one today. I was making some pretty small parts in the lathe (about 1" sticking out of the collet). After I set my G50's and ran a part, I decided to adjust the offset on the Z axis by .010". Evidently, the number pad on my control panel is a bit worn and it didn't read the first couple of keystrokes and input 1" instead...  . Needless to say, the tool hit the collet, sparks flew and it grinded to a halt. A very expensive turning tool down the crapper. Luckily, the boss was in a good mood and said not to worry about it. Not really my fault, but I should have double-checked the screen to insure that the correct adjustments were made and read by the computer. Oh well. At least it wasn't a boring day as usual...  |
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03-24-2005, 07:31 PM
| #2 |
| 06 Super National Champ   Join Date: Jun 2004 Location: Tennessee
Posts: 10,268
| Worst CNC mistake? Buying manual equipment. |
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03-24-2005, 09:05 PM
| #3 |
| Rock Crawler Join Date: Apr 2004 Location: Longmont, CO
Posts: 905
| About 2 months ago I meant to jog down .001 but the jog was set at 1.000 Made a mess of my three jaw I was using to fixture parts. a couple of weeks ago I busted 3 new carbide endmills in about an hour. 1st just broke cutting parts, not sure why. The other two were stupid mistakes on my part. After the 3rd one I went upstairs and poured some scotch. |
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03-24-2005, 09:21 PM
| #4 |
| RCC Addict Join Date: Jan 2005 Location: Green River Kentucky
Posts: 1,069
| Got one better than that one of the guys in my machine shop class left the big t chuck wrench in the lathe and turned it on and took off his thumb when it came back around. |
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03-24-2005, 09:25 PM
| #5 |
| Rock Crawler Join Date: Dec 2004 Location: Land of the Free, because of the Brave
Posts: 896
| Ace...ouch. Try this one.... About 6 months ago, a former co-worker broke a 1.00"Ø carbide boring bar and then just said "oops". Have you priced one of those lately? Needless to emphasize (but I will anyway)... former Last edited by WRMorrison; 03-25-2005 at 02:59 PM. |
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03-24-2005, 09:27 PM
| #6 | |
| Rock Crawler Join Date: Dec 2004 Location: Land of the Free, because of the Brave
Posts: 896
| Quote:
Damn! | |
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03-24-2005, 09:34 PM
| #7 |
| RCC Addict Join Date: Jan 2005 Location: Green River Kentucky
Posts: 1,069
| It was barley hanging on we tried to get it out with it attached but the lathe was locked up tight it bent the t handle and wouldnt budge.So we had to cut like one or two places to get it out it wasnt saveable anyway it was plum FLAT and MANGLED.He was happy just to be free from the lathe.My teacher also left it in one time chucked it all the way accross the shop thank god noone was in the way. |
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03-24-2005, 09:40 PM
| #8 | |
| 2006 2.2 National Champ  Join Date: Dec 2004 Location: Driving my R/C rototiller
Posts: 7,923
| Quote:
That's just scary, I think you need to find a different school.My worst is probably plowing a set of soft jaws with a 2 inch facemill, believe it or not the alum ripped every seat off the cutter. | |
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03-24-2005, 11:09 PM
| #9 |
| I wanna be Dave Join Date: Jun 2004 Location: Centennial, CO
Posts: 2,144
| Holy nuts. Thats some scary stuff there. My biggest mistake was sending the wrong drawings for my TSC-10 chassis with the link mount holes 1/4 inch off each. I had to remachine all 50 units myself. "D'oh!" |
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03-25-2005, 09:39 AM
| #10 |
| Rock Crawler Join Date: Feb 2004 Location: The Gay NorthWest
Posts: 505
| the biggest mistake ive ever done is had the speed up to high and broke a bit... not really that bad but i thought i share while we were on topic |
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03-25-2005, 02:49 PM
| #11 |
| Rock Crawler Join Date: Apr 2004 Location: Longmont, CO
Posts: 905
| Running a "real" mill with 15 or more horsepower and silly fast rapids would be scary. I have the advantage that if I'm having a bad day or I'm not focused I can just wait till I feel more in to it. Doing it every day as your main job would be tough. |
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03-25-2005, 06:49 PM
| #12 | |
| Est. 2003   Join Date: Jun 2004 Location: On the Boat to Whore Island
Posts: 3,994
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04-26-2005, 12:07 AM
| #13 |
| owner, Holmes Hobbies LLC  Join Date: Nov 2004 Location: Volt up! Gear down!
Posts: 14,854
| my biggest mistake was cancelling the order for my mill two months ago.... |
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04-26-2005, 12:59 AM
| #14 | |
| Pebble Pounder Join Date: Oct 2004 Location: Colorado
Posts: 166
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05-02-2005, 01:09 AM
| #15 |
| Newbie Join Date: Nov 2004
Posts: 9
|  I was working a place that did custom plastis parts & I had like 300 peices to mill flat.I shimmed the peice so wound`t come loose but my boss didn`t like my idea of taking to passes to finish each peice & I sheepishly said I`ve tried to snugg it up but the peices pops out to easily.Well my bosses says I`ll so how you just need to wiggle the small flat peice of aluminium in place.Well he fires up the mill & while the bite spinning to make shure that the everything cleared hes starts pushing/tapping the small flat peice of aluminium with a peice of round stock or what ever we had on hand.Then all of the sudden I hear **TWING** & I all I could see was this sliver flash.The cutting bite caught the small flat peice of aluminium & pulled it right outta the vice & shot if a cross the shop.Nobody was hurt but the cutting bite & the peice of aluminium were toast |
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05-13-2005, 01:27 PM
| #16 |
| Quarry Creeper  Join Date: Mar 2004 Location: VA
Posts: 475
| Not realy my mistake, but I got the a** chewing anyway. I was running a Fanuc milling center with an 8 tool turret and about half way thru a 10min cycle it switched to the third tool and went into rapid traverse on the Z axis and tried to drive the tool thru the bed. Broken tool, tool holder, fixture, and spindle. It ejected most of the tool holder which bounced off the window right in front of me, thankfully it was enclosed. Machine was down for almost a week. |
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06-01-2005, 09:12 PM
| #17 |
| Pebble Pounder Join Date: Dec 2004 Location: Delaware A Place With No Rocks!
Posts: 144
| Couple of days ago i was making some steering links and i left the T wrench in the lathe but luckliy it flew out and no damage was done. It scared the s*%@ out of me though |
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06-01-2005, 11:10 PM
| #18 |
| Quarry Creeper Join Date: May 2005 Location: lost in vintage tamiya land.
Posts: 305
| Well i've never done any cnc machineing but i'd have to say the worst one i've seen is my uncles missing bit of thumb. But i think he actually did that on a lathe. |
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06-02-2005, 02:37 AM
| #19 | |
| 2006 2.2 National Champ Join Date: Dec 2004 Location: Driving my R/C rototiller
Posts: 7,923
| Quote:
NEVER leave the T-handle in the chuck!!  | |
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06-02-2005, 12:49 PM
| #20 |
| Newbie Join Date: Aug 2004
Posts: 3
| i did the smae thing with my drill press except dumbazz me stuck it in there just to se what itwould do...not only did it scareme, it almost tookm thumb off |
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