Difference between revisions of "Superhard Drills"
Jump to navigation
Jump to search
(monracororla) |
|||
| (7 intermediate revisions by 2 users not shown) | |||
| Line 1: | Line 1: | ||
| − | |||
Harder drill bits than the usual HSS are needed for drilling high hardness workpieces. These include: | Harder drill bits than the usual HSS are needed for drilling high hardness workpieces. These include: | ||
* Stainless steel | * Stainless steel | ||
| Line 12: | Line 11: | ||
'''HSS''' Standard drill bits are HSS. | '''HSS''' Standard drill bits are HSS. | ||
| − | '''Cobalt''' drill bits. These can be used for drilling out broken HSS drill bits. They are also used for drilling stainless steel, but stainless is liable to blunt them. | + | '''Cobalt''' drill bits. These can be used for drilling out broken HSS drill bits. They are also used for drilling stainless steel, but stainless is liable to blunt them. Cobalt steel bits can work at higher temperatures than HSS. Cobalt bits are not all equally effective. |
'''C 1150''' with short flutes and long shank. | '''C 1150''' with short flutes and long shank. | ||
| Line 18: | Line 17: | ||
'''D 200''' twist drills look like ordinary HSS drills, but are hard enough for reliable service with stainless steel. | '''D 200''' twist drills look like ordinary HSS drills, but are hard enough for reliable service with stainless steel. | ||
| − | ''' | + | '''Tungsten carbide tipped''' drill, sold as multi-material bits for wood, steel & masonry. Not to be confused with masonry bits, which have geometry no use for wood or steel. |
| − | |||
| − | |||
| + | '''Solid tungsten carbide''' drill. Hard enough to drill through screw extractors. [http://groups.google.com/group/sci.electronics.design/browse_frm/thread/c421007ec79a7cfb# Experience] with them. | ||
=Coated Bits= | =Coated Bits= | ||
Coated bits have the advantage of a tough cutting edge without the increasing brittleness that comes with harder materials. The drawback is that once resharpened, the advantage of the hard coating is lost. | Coated bits have the advantage of a tough cutting edge without the increasing brittleness that comes with harder materials. The drawback is that once resharpened, the advantage of the hard coating is lost. | ||
| − | '''Titanium Nitride''' or TiN. A gold coloured coating applied to HSS bits. | + | '''Titanium Nitride''' or TiN. A gold coloured coating applied to HSS bits. Good for drilling aluminium, which sticks to HSS. |
'''Titanium Aluminium Nitride''' or TiAlN is harder than TiN. | '''Titanium Aluminium Nitride''' or TiAlN is harder than TiN. | ||
| Line 32: | Line 30: | ||
'''Zirconium Nitride''' has also been used as a coating for HSS bits. | '''Zirconium Nitride''' has also been used as a coating for HSS bits. | ||
| + | '''Diamond''' powder drills are the hardest of all. Water is often required to avoid overheating. Diamond bits are also around that have very little diamond on them. | ||
=See Also= | =See Also= | ||
| − | + | * [[Special:Allpages|Wiki Contents]] | |
| − | [http://www.diyfaq.org.uk/powertools/drillfaq.htm The Drill bits and Drilling FAQ] | + | * [[Special:Categories|Wiki Subject Categories]] |
| − | + | * [http://www.diyfaq.org.uk/powertools/drillfaq.htm The Drill bits and Drilling FAQ] | |
| − | [[Drill Bits]] | + | * [[Drill Bits]] |
[[Category:Tools]] | [[Category:Tools]] | ||
[[Category:Metal]] | [[Category:Metal]] | ||
Latest revision as of 13:45, 30 January 2019
Harder drill bits than the usual HSS are needed for drilling high hardness workpieces. These include:
- Stainless steel
- Hardened steel
- etc
Presented in order of increasing hardness, and inevitably increasing brittleness:
Solid Material Bits
HSS Standard drill bits are HSS.
Cobalt drill bits. These can be used for drilling out broken HSS drill bits. They are also used for drilling stainless steel, but stainless is liable to blunt them. Cobalt steel bits can work at higher temperatures than HSS. Cobalt bits are not all equally effective.
C 1150 with short flutes and long shank.
D 200 twist drills look like ordinary HSS drills, but are hard enough for reliable service with stainless steel.
Tungsten carbide tipped drill, sold as multi-material bits for wood, steel & masonry. Not to be confused with masonry bits, which have geometry no use for wood or steel.
Solid tungsten carbide drill. Hard enough to drill through screw extractors. Experience with them.
Coated Bits
Coated bits have the advantage of a tough cutting edge without the increasing brittleness that comes with harder materials. The drawback is that once resharpened, the advantage of the hard coating is lost.
Titanium Nitride or TiN. A gold coloured coating applied to HSS bits. Good for drilling aluminium, which sticks to HSS.
Titanium Aluminium Nitride or TiAlN is harder than TiN.
Zirconium Nitride has also been used as a coating for HSS bits.
Diamond powder drills are the hardest of all. Water is often required to avoid overheating. Diamond bits are also around that have very little diamond on them.