http://www.threedollarsquirrel.com/tipped-drill/
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 3pcs 1 4 Diamond tipped drill bit hole $5.99 Time Remaining: 1d 1h 16m Buy It Now for only: $5.99 |
 6 pc SPEAR CARBIDE TIP POINT DRILL BIT GLASS CUT TILE CONCRETE BRICK NEW w CASE $17.50 Time Remaining: 8h 18m Buy It Now for only: $19.95 |
 9 pieces set Diamond tipped coated drill bit hole saw drills 11 to 25mm $13.98 Time Remaining: 14d 21h 12m Buy It Now for only: $13.98 |
 20 pcs 2MM Diamond tipped drill bit HOLE SAW glass core solid bits $9.99 Time Remaining: 22h 55m Buy It Now for only: $9.99 |
 100mm 4 Diamond coated tip drill bit hole saw drills $18.99 Time Remaining: 4d 21h 34m Buy It Now for only: $18.99 |
 50mm 2 inch Diamond tipped coated drill bit hole saw $8.99 Time Remaining: 11d 7h 56m Buy It Now for only: $8.99 |
 30 pieces Diamond tipped coated rotary burrs glass drill bit GRIT 40 $7.99 Time Remaining: 3d 22h 26m Buy It Now for only: $7.99 |
 85mm Diamond tipped drill bit hole saw core glass tile drills $15.00 Time Remaining: 2d 22h 26m Buy It Now for only: $15.00 |
 65mm Diamond coated drill bit bits hole saw tipped tile $5.00 Time Remaining: 12d 7h 27m Buy It Now for only: $5.00 |
 20 x 2MM Diamond tipped drill bit HOLE SAW glass core solid bits drills $9.99 Time Remaining: 5d 21h 57m Buy It Now for only: $9.99 |
 30 Diamond tipped rotary point burrs burr point drills bits TYPE 2 $6.50 Time Remaining: 21h 57m Buy It Now for only: $6.50 |
 5 pcs 8mm Diamond tipped drills bit bits hole saw core $9.18 Time Remaining: 3d 9h 36m Buy It Now for only: $9.18 |
 1 2 diamond tipped drill bit glass bottles blocks $5.75 Time Remaining: 1d 1h 17m Buy It Now for only: $5.75 |
 6 Carbide Tip Glass Ceramic Tile Set for Cordless or Power Drill + Dewalt P2 Bit $22.95 Time Remaining: 13d 13h 50m Buy It Now for only: $22.95 |
 5mm Diamond coated tipped drill bit hole saw 10 pieces $6.20 Time Remaining: 25d 5h 58m Buy It Now for only: $6.20 |
 6 pc SPEAR CARBIDE TIP POINT DRILL BIT GLASS CUT TILE CONCRETE BRICK NEW w CASE $17.50 Time Remaining: 1d 10h 39m Buy It Now for only: $19.95 |
 70mm Diamond tipped hole saw core drill with PILOT BIT $14.00 Time Remaining: 6d 22h 26m Buy It Now for only: $14.00 |
 20 pieces 2MM Diamond coated tipped drill bit HOLE SAW glass drills solid bits $9.99 Time Remaining: 3d 22h 26m Buy It Now for only: $9.99 |
 3 pcs 10mm Diamond coated tipped drill bits hole saw $3.50 Time Remaining: 7h 33m Buy It Now for only: $3.50 |
 5 x 8mm 5 16 Diamond tipped drills bit bits hole saw $5.99 Time Remaining: 2d 22h 55m Buy It Now for only: $5.99 |
 32mm Diameter Sharp Tipped Glass Hole Saw Drilling Tool $4.83 Time Remaining: 25d 20h 31m Buy It Now for only: $4.83 |
 Sharp Tip 5mm Glass Hole Cutting Saw Drilling Tool 2pcs $3.26 Time Remaining: 5d 23h 58m Buy It Now for only: $3.26 |
 3pcs 28mm Diamond tipped coated drill bit hole saw tile $9.50 Time Remaining: 12d 7h 32m Buy It Now for only: $9.50 |
 50mm Diamond coated tipped hole saw drills bit marble $5.00 Time Remaining: 9d 10h 36m Buy It Now for only: $5.00 |
 20 pieces 2MM Diamond tipped drill drills bit HOLE SAW solid core bits $9.99 Time Remaining: 16d 21h 4m Buy It Now for only: $9.99 |
 Glass Tile Drill Bit Set 6 Professional C3 Tungsten Tip f Glasstilesceramics $21.21 Time Remaining: 10d 12h 19m Buy It Now for only: $21.21 |
 110mm Diamond Tipped Drilling Tool Glass Tile Hole Saw $16.76 Time Remaining: 12d 6h 35m Buy It Now for only: $16.76 |
 85mm Diamond coated tipped drill bit hole saw marble $8.30 Time Remaining: 25d 5h 54m Buy It Now for only: $8.30 |
 Glass Plate Cutting 20mm Hole Saw Drilling Tool Tip $3.61 Time Remaining: 23d 17h 16m Buy It Now for only: $3.61 |
 6 pc SPEAR CARBIDE TIP POINT DRILL BIT GLASS CUT TILE CONCRETE BRICK NEW w CASE $17.50 Time Remaining: 4d 4h 19m Buy It Now for only: $19.95 |
 75mm Diamond coated tipped drill bit hole saw for glass $7.50 Time Remaining: 11d 5h 54m Buy It Now for only: $7.50 |
 Tile Marble 18mm Hole Saw Drilling Bit Tip Power Tool $4.25 Time Remaining: 18d 9h 16m Buy It Now for only: $4.25 |
 Glasses Plate Cutting Hole Saw 23mm Drilling Tool Tip $3.67 Time Remaining: 11d 15h 46m Buy It Now for only: $3.67 |
 Sharp Tip 5mm Glass Hole Cutting Saw Drilling Tool 2pcs $2.72 Time Remaining: 20d 14h 53m Buy It Now for only: $2.72 |
 6 pc SPEAR CARBIDE TIP POINT DRILL BIT GLASS CUT TILE CONCRETE BRICK NEW w CASE $19.95 Time Remaining: 12d 7h 36m Buy It Now for only: $19.95 |
 110mm Diamond Tipped Drilling Tool Glass Tile Hole Saw $13.53 Time Remaining: 22d 11h 32m Buy It Now for only: $13.53 |
 32mm Diameter Sharp Tipped Glass Hole Saw Drilling Tool $4.60 Time Remaining: 15d 13h 35m Buy It Now for only: $4.60 |
 Glasses Plate Cutting Hole Saw 23mm Drilling Tool Tip $3.82 Time Remaining: 21d 33m Buy It Now for only: $3.82 |
 Tile Marble 18mm Hole Saw Drilling Bit Tip Power Tool $4.52 Time Remaining: 10d 6h 12m Buy It Now for only: $4.52 |
 70mm Diamond tipped hole saw core drill w PILOT BIT $13.00 Time Remaining: 8d 23h 13m Buy It Now for only: $13.00 |
 32mm Diameter Sharp Tipped Glass Hole Saw Drilling Tool $5.18 Time Remaining: 10d 17h 48m Buy It Now for only: $5.18 |
 110mm Diamond Tipped Drilling Tool Glass Tile Hole Saw $16.74 Time Remaining: 3d 2h 31m Buy It Now for only: $16.74 |
 18mm Diamond Coat Tip Glass Hole Saw 2pcs Drilling Tool $4.17 Time Remaining: 1d 13h 11m Buy It Now for only: $4.17 |
 Tile Marble 18mm Hole Saw Drilling Bit Tip Power Tool $4.34 Time Remaining: 42m |
 Tile Marble 18mm Hole Saw Drilling Bit Tip Power Tool $4.33 Time Remaining: 17d 8h 44m Buy It Now for only: $4.33 |
 32mm Diameter Sharp Tipped Glass Hole Saw Drilling Tool $4.77 Time Remaining: 7d 23h 32m Buy It Now for only: $4.77 |
 Sharp Tip 5mm Glass Hole Cutting Saw Drilling Tool 2pcs $3.24 Time Remaining: 14d 34m Buy It Now for only: $3.24 |
 Glass Plate Cutting 20mm Hole Saw Drilling Tool Tip $3.61 Time Remaining: 3d 11h 11m Buy It Now for only: $3.61 |
 110mm Diamond Tipped Drilling Tool Glass Tile Hole Saw $16.15 Time Remaining: 21d 20h 5m Buy It Now for only: $16.15 |
 18mm Diamond Coat Tip Glass Hole Saw 2pcs Drilling Tool $4.52 Time Remaining: 14d 12h 59m Buy It Now for only: $4.52 |
 Tile Marble 18mm Hole Saw Drilling Bit Tip Power Tool $3.96 Time Remaining: 16d 2h 31m Buy It Now for only: $3.96 |
 110mm Diamond Tipped Drilling Tool Glass Tile Hole Saw $16.15 Time Remaining: 7d 14h 59m Buy It Now for only: $16.15 |
 Glass Plate Cutting 20mm Hole Saw Drilling Tool Tip $3.91 Time Remaining: 11d 11h 55m Buy It Now for only: $3.91 |
 110mm Diamond Tipped Drilling Tool Glass Tile Hole Saw $13.53 Time Remaining: 4d 7h 49m Buy It Now for only: $13.53 |
 Glass Plate Cutting 20mm Hole Saw Drilling Tool Tip $7.31 Time Remaining: 16d 7h 16m Buy It Now for only: $7.31 |
 110mm Diamond Tipped Drilling Tool Glass Tile Hole Saw $16.17 Time Remaining: 9d 12h 54m Buy It Now for only: $16.17 |
How are hardened cutting tools manufactured?
For example, diamond tipped drills or cutters. If diamond is the hardest substance on Earth, what substance can possibly be employed to machine it?
Also, how are hardened lathe/drill bits manufactured?
Diamond tip tools are used in a fashion that grinds like sandpaper. The diamonds are small bits and dust that is on the surface of the substrate (cutting tool). The diamonds are not machined to a specific shape, but are selected by size. There are a few technologies for keeping the diamonds on the surface, but the basic idea is glue. Different substrates and glues are used depending upon what you are cutting.
Another technology for tools is carbide tips. Carbides are salt-like compounds formed from carbon and a metal. Carbides comes in many forms, but the most common for cutting tools is tungsten carbide and titanium carbide. Carbide is almost as hard as diamond, but much cheaper since it can be manufactured instead of mined. Again, the difficulty of using it on cutting tools is how to attach chunks of carbide to the business end of the cutting tool. Carbide can be shaped to fit and brazed in place. See link with picture. You can see the tip of a saw blade shaped and sharpened. The blade tip is bonded to the wheel with brazing.
The oldest technology is high carbon steel. In this case, the entire tool is made of steel with between 0.5% and 1% carbon content. The steel can be made soft through heat treatment process called annealing. The steel is heated to a high temperature and then cooled very slowly over many hours. Once annealed, the steel can be machined and worked to the shaped desired. Afterward, the steel is put through another heat treatment to re-harden by heating the steel and then cooling very quickly by quenching in oil or air. After the hardening, the cutting edge is sharpened and honed to the desired cutting edge.
Nelly - Tip Drill