Hardest Materials vs 60,000 PSI Waterjet

obsidian quartz topaz and a ceramic composite waterjet hardness challenge we have items ranging from the middle of the most scale ish at six all the way to the top the mohs scale is not the guy from the simpsons no if this gets out the next words you say will be muffled by your own butt the mohs skill is a comparative scratch test to determine how hard a material is so it goes from a one to a ten one being talc and ten being diamond and how this works is we have a material topaz that is an eight on the mohs scale and we have quartz which is a 7 on the mohs scale so this topaz can scratch the quartz but not the other way around boom scratched so obsidian is about a 6 quarts is a seven topaz is an eight and this is a ceramic that we don't really know what it is but we know that this ceramic is harder than an eight because the topaz it actually wears off the topaz the scratch is not here and it's wearing a flat spot on the topaz this is from a wear plate on a conveyor that was transporting rock and gravel yeah so this is the hardest thing that we've ever had to cut here as you can see this has already been somewhat cut but more chiseled off by the water jet so for being on the inch thick it took way longer than it should have and what we're gonna do is we're gonna try and go right through the center of a couple of these ceramic nubs cylinders cylinders to see how how hard it actually is obsidian is the softest material that we have so we're going to start with it and we're going to use it as a baseline our water jet doesn't have obsidian as a setting it's got a bunch of granite and then it's got silica which obsidian has a ton of silica in it so we're gonna try that cut the obsidian and then we'll run the water jet at the same speed and same rate over the other three materials and compare how much damage is done to each one and see if we can kind of see that progression the mohs scale is a scratch test and the water jet essentially is just scratching its way through whatever material it's cutting waterjet uses a garnet abrasive to scratch its way through whatever material it's cutting this gets added into the water right before it comes out of the nozzle and that's what actually does the cutting [Music] and that is a perfect cut we had the speed just right that is our baseline so now we're going to throw up all the other materials on here cut them at that same speed and then compare the amount of damage and the cleanliness of the cut [Music] [Music] so in order for the test to be accurate in between each item we changed the thickness to the height of whatever we were cutting but kept it going the same speed which means this was as if it was cutting through an inch and a half of silica this was like three quarters of an inch of silica this was inch and a quarter silica the obsidian is a pretty freaking clean cut the quartz clean curves on there but yeah they're on the right side you can see where the water jet trails behind a little bit and it's a little bit of a rougher cut so on a water jet usually when you cut something too fast the cut quality just diminishes and we can kind of start seeing that there the topaz is way harder and we only got maybe a quarter of an inch into it ceramic we're probably a sixteenth of an inch in now the mohs scale is not a linear scale but it's also not a true logarithmic scale from what we were able to find it is a near logarithmic scale which means each time you go up a number on the scale it gets exponentially harder right uh yeah which would explain why we were able to cut all the way through this one and not even get halfway on topaz which is just one level higher on the scale and then just to be 100 sure in scientific we're going to give this to mitchell's new lick test intern to see if that piece has actually been cut all the way through that was not cut all the way through he's right okay so now that we've learned enough we just want to cut through something that's really hard so we're going to slow it way down and see what exactly it takes to get through [Music] this [Music] so oh it's actually cut finally made it through although the bottom of that cut looks really bad so we started it out at inch and a quarter tungsten which was about uh 0.32 inches a minute but that was way too fast and i had to slow it down to 30 percent of that which came out to about a tenth of an inch per minute and so that would take 10 minutes to cut an inch which lines up about right this was like 14 14 minutes to cut so that is crazy how hard that stuff is but the water jet did it it did it it looks terrible but it didn't and that's what counts so for like good cut quality we probably have to go like even what would that be like ten times slower this would be what we call like worse than a hundred percent cut quality and they go all the way like twenty percent is considered really good twenty percent speed so you'd wanna go twenty percent of this to get a decent cut quality so it would essentially take you five times longer so it would take you 50 minutes to do an inch if you wanted good cut quality but because the material has varying hardnesses at two dollars a minute that bottom side is always going to cost you a hundred dollars per inch at two dollars a minute it would be like a hundred dollars per inch if you flipped it and cut the steel side first then you'd get a clean air on the steel and you'd blow out on the on the on this side but you're already starting to get a bad cut quality there on the ceramic just through the top layer ceramic is hard that's the moral of the story so all the things in the comments that you said were really hard is not as hard as this we are actually going to hand this over to mitchell's new lick test intern can you uh tell us if that's been cut yeah it's cut through no oh no i screwed it up

Channel: Waterjet Channel

Views: 2,898,207

Keywords: waterjet channel, water jet, water jet cutting, waterjet, water cutting, water cutter, cutting with water, cutting, cut, cross section, cross-section, cut in half, inside, interesting, science, fascinating, satisfying videos, hardest materials, sapphire, ceramic hardness, ceramic tests, cutting ceramic, quartz, corundum, obsidian, top 10, 60000 psi waterjet price, topaz

Id: 7eWLnsPZawo

Length: 8min 9sec (489 seconds)

Published: Fri Jul 31 2020