Subdeacon Joe Posted May 3, 2019 Share Posted May 3, 2019 Not the shop I work at, thank God. I bet there were lots of soiled pants there. From Facebook, I don't think D & J Precision has it up on Youtube yet. Link to comment Share on other sites More sharing options...
Pat Riot Posted May 3, 2019 Share Posted May 3, 2019 Man! That piece that went through the wall(s) must have been going maybe 1000 FPS. Lucky no one was hurt. Link to comment Share on other sites More sharing options...
G W Wade Posted May 3, 2019 Share Posted May 3, 2019 WOW Link to comment Share on other sites More sharing options...
Sedalia Dave Posted May 3, 2019 Share Posted May 3, 2019 I find it troubling that the machine has such a flimsy containment enclosure. That part would have easily penetrated more than one person had they been in its path. Link to comment Share on other sites More sharing options...
Subdeacon Joe Posted May 3, 2019 Author Share Posted May 3, 2019 27 minutes ago, Sedalia Dave said: I find it troubling that the machine has such a flimsy containment enclosure. That part would have easily penetrated more than one person had they been in its path. 1/16 inch isn't all that flimsy. Did you see the size of the vise that was broken? They can't design again every possible failure. Figure that the jagged chunk of metal that went flying off weighed close to a pound, if not more, moving as fast as a slug from a. 45 ACP. Link to comment Share on other sites More sharing options...
Sedalia Dave Posted May 3, 2019 Share Posted May 3, 2019 1 hour ago, Subdeacon Joe said: 1/16 inch isn't all that flimsy. Did you see the size of the vise that was broken? They can't design again every possible failure. Figure that the jagged chunk of metal that went flying off weighed close to a pound, if not more, moving as fast as a slug from a. 45 ACP. 1/16" won't stop a .22 caliber long rifle. At 11000 rpm the linear velocity assuming a 7.8 inch radius was about 760 fps. The issue was the mass of the object assuming 2 pounds it had about 18000 ft lbs of kinetic energy. ( Note: I am not a rocket scientist and my calculations could be way off but I have reasonable confidence in my numbers. ) I understand that is a tremendous amount of ke but with today's safety standards I would have expected the manufacturer to have provided a containment vessel at least capable of slowing any shrapnel down. There are a lot of light weight composite materials that are not super expensive that while not containing the failure could have slowed the velocity enough that it wouldn't have left the containment enclosure like it had been fired from a cannon. I also wonder why the machine didn't have a safety sensor to detect out of balance loads and shut the machine down rather quickly. Link to comment Share on other sites More sharing options...
Marshal Mo Hare, SASS #45984 Posted May 3, 2019 Share Posted May 3, 2019 It is a good thing that nobody got hurt, else OSHA would be all over that place like ants on a dropped cotton candy. Link to comment Share on other sites More sharing options...
Eyesa Horg Posted May 3, 2019 Share Posted May 3, 2019 WOW & Holy crap, that could of been way worse. Link to comment Share on other sites More sharing options...
The Original Lumpy Gritz Posted May 3, 2019 Share Posted May 3, 2019 Looks like a balance issue and/or the programmed cutter RPM was set to high. OLG Link to comment Share on other sites More sharing options...
Trailrider #896 Posted May 3, 2019 Share Posted May 3, 2019 Hotel Sierra! A really BAD RUD! Link to comment Share on other sites More sharing options...
Subdeacon Joe Posted May 3, 2019 Author Share Posted May 3, 2019 4 hours ago, The Original Lumpy Gritz said: Looks like a balance issue and/or the programmed cutter RPM was set to high. OLG Something like that will usually run at something like 700 RPM to 1000 RPM. MAYBE 1200 or 1300 RPM if you are barely taking any material. Guy said 12,000 RPM. I think maybe either the programmer or the machinist entered one zero too many. Link to comment Share on other sites More sharing options...
The Original Lumpy Gritz Posted May 3, 2019 Share Posted May 3, 2019 3 hours ago, Subdeacon Joe said: Something like that will usually run at something like 700 RPM to 1000 RPM. MAYBE 1200 or 1300 RPM if you are barely taking any material. Guy said 12,000 RPM. I think maybe either the programmer or the machinist entered one zero too many. After I was able to hear the audio. The RPM was the root cause. Plus it 'threw' the counter-balance You can run a fly-cutter well above 1200RPM, when let's say you are 'decking' Alum. Never seen a 1 cuter fly-cutter like they were using. The ones I build were at least 2 it not 3 cutters. I would attach washers to the arms to balance the assembly. That shop, had a full squad of Angels watching over it that day. OLG Link to comment Share on other sites More sharing options...
Subdeacon Joe Posted May 4, 2019 Author Share Posted May 4, 2019 48 minutes ago, The Original Lumpy Gritz said: That shop, had a full squad of Angels watching over it that day. And putting in overtime. Link to comment Share on other sites More sharing options...
Wallaby Jack, SASS #44062 Posted May 4, 2019 Share Posted May 4, 2019 hmmmmmmm ……… things that make you say "oops" ……. Link to comment Share on other sites More sharing options...
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