And what country can preserve its liberties if their rulers are not warned from time to time that their people preserve the spirit of resistance? Let them take arms. The remedy is to set them right as to facts, pardon and pacify them. What signify a few lives lost in a century or two? The tree of liberty must be refreshed from time to time with the blood of patriots and tyrants.
A good bit of the heat is leaving with the swarf. My big lathe will generate swarf (the off cuts) that are blue and smoking. The feed stock has a much higer mass so the heat buildup is slower. The carbide cutter cares not. Even HSS (High Speed Steel) cutting bits are designed to not lose strength at very elevated temperatures.
most of the heat leaves in the chip. The reason for coolant is to flush chips away and more importantly to stabilize the temperature of the part you are making. If it gets hot, it grows some and then the cut is deeper and when it cools, the part is undersize. Also, coolant usually makes the chip break off cleaner from the cutter. It the chip gets hot, it acts more like gum, and can also load up the tip of the cutter. Uh, this shit is a pretty serious science....and cutter tech is really important to be competitive.
Carbides and coatings they have developed now is mind blowing. Pretty advanced technology. Can't imagine what SpaceX must use for their secret super hi temp resistant SX400 alloy, they developed for the Raptor 3 engines.
Got one of those cutters. Serious hp. As noted above, 90-95% of the heat goes into the swarf, and of course in the real world this would be running flood coolant as well (this is likely a demo).
If it was generating too much heat wouldn't they be applying cutting fluid?
ReplyDeleteAl_in_Ottawa
whale jooce
DeleteYes. High volume flood. Unlikely to be emulsified lard oil these days - sorry, no whale jooce - as coolants are as highly engineered as the cutters.
DeleteA good bit of the heat is leaving with the swarf. My big lathe will generate swarf (the off cuts) that are blue and smoking. The feed stock has a much higer mass so the heat buildup is slower. The carbide cutter cares not. Even HSS (High Speed Steel) cutting bits are designed to not lose strength at very elevated temperatures.
ReplyDeletemost of the heat leaves in the chip. The reason for coolant is to flush chips away and more importantly to stabilize the temperature of the part you are making. If it gets hot, it grows some and then the cut is deeper and when it cools, the part is undersize. Also, coolant usually makes the chip break off cleaner from the cutter. It the chip gets hot, it acts more like gum, and can also load up the tip of the cutter. Uh, this shit is a pretty serious science....and cutter tech is really important to be competitive.
ReplyDeleteCarbides and coatings they have developed now is mind blowing. Pretty advanced technology. Can't imagine what SpaceX must use for their secret super hi temp resistant SX400 alloy, they developed for the Raptor 3 engines.
DeleteGot one of those cutters. Serious hp. As noted above, 90-95% of the heat goes into the swarf, and of course in the real world this would be running flood coolant as well (this is likely a demo).
ReplyDeleteA tip o' me 'at to my colleagues here.
ReplyDeleteAt the rpms the video plays at not much.
ReplyDeleteI suspect slow motion, in real life, those chips are flying and hot.
DeleteDo not let those chips bounce off your jacket and into a glove.