If a drill bit that was cut out of a single large diamond were made, would it last forever, assuming it was never used to drill through diamond and was never exposed to a laser? Would it ever get dull or break?
Sorry, but that is incorrect. Lasers have only been around for a little over 50 years. Diamond cutting is quite a bit older and remarkably involves only the use of hand-held tools used by trained and highly skilled individuals.Well, I imagine diamonds are usually fashioned with lasers.
Ten feet is wildly larger than the largest diamond ever found.But I also realize that if you were to have a ten foot long drill bit made out of pure diamond, and you encased 5 feet of the bit in cement, and you applied enough torque to the other end, then you would snap the bit in half.
http://en.wikipedia.org/wiki/Diamond#Industrial-grade_diamondsBut I'm wondering what would happen in normal conditions. What if you had a pure diamond drill bit, and did not abuse it. Would it cut holes in granite forever, without ever getting dull?
Your question could be rephrased:So...
Would a pure diamond drill bit, under ideal conditions, ever get dull from drilling through granite?
Your question could be rephrased:
Will the carbon atoms on the surface of a monocrystalline drill bit, continually being used to drill through granite, ever break their bonds with their neighboring carbon atoms?
The carbon-carbon bond has a certain energy.
The likelihod those atoms will remain in that bonded state can be estimated with the boltzmann distribution. http://en.wikipedia.org/wiki/Boltzmann_distribution
Even if you continually cool the drill bit and have a liquid lubricant, statistically over long enough time, one of the carbon bonds will break.
I guess your basic question is if a cutting tool (not necessarily diamond) is harder than the material it cuts, will it last forever?If a drill bit that was cut out of a single large diamond were made, would it last forever, assuming it was never used to drill through diamond and was never exposed to a laser? Would it ever get dull or break?