Superhard Drills

From DIYWiki
Revision as of 23:26, 12 March 2008 by (talk) (monracororla)
Jump to navigation Jump to search

worker compensation lawyer gang latin queens racing post mya sexy impact of video games on children drugs next skating star eric clapton guitar auction craig morgan encyclopedia for kids zodiac mp3 player bbw swingers website free pussy australian artist in paris family dental plan chad pennington handbags replica dansko 38 men in leather recessive sachs tay memorial pet urns ucla arizona football cubase sx 3 crack announcement illinois public service video 35 episode moon sailor beer store canada aircraft crash video clip stroganoff meatballs cyrus electrical equipment repair org chart tools squirting pussy video movies free sex in iraq picture video war notre dame alumni club urinals using pointing finger face lift third grade software engine fits navtech cd peterson gas fireplace logs free adult movie xxx view college grants for single mom nature spirit pictures adobe acrobat download free valentine day plastic canvas pattern aishwarya rai images from the movie shabd fosters home wilt kentucky state fair phantom of the opera busting vegas cartier relojes lerner catalog christian drug rehab center turbocharger honda long vacation weekend long fingernails video special interest wrestling cellulite treatment card deck tarot university of hawaii graduate studies jay leno southport library indianapolis carisoprodol online play casino game ddd size embassy nude celebs arbor decks 2001 lincoln ls amateur free gallery movie porn free resume template u.s marketing and promotion motorola v300 case www embird software free us cellular ringtone for motorola phone lew welch password natural breast bra toy story 2 obesity causes heart disease paris hilton quotes lost in space 2 the movie oberwerk binoculars arvida home page sex personal jarvis street valentine day hate quote free composer ringtone seminyak hotels riemann funeral home gulfport sexy black woman aleve russian woman single bride amish in ohio piercing tattoo clomid infertility delonghi toaster image map code heb store quotes and sayings enabling statutes maysville ledger independent newspaper ppl confuser painting companies 5014 gateway screen saers homeclips password absence of malice movie review gothic teen sex pill reference valium yorkshire terrier puppy picture albanian population in usa washington state waterfront home anal kristal movie summer business card paper glossy online korean translation granny blow job las olas resort panama aaj jane ki zid na karo download skating bails video adenosine warning quadriderm panasonic vcr remote control photographic memory test dingo go carts jobs in recreational therapy spears stolen baby picture commission employment equal opportunity texas teen foot lovers sexy dress amtrak fares lynching videos http quinine sulfate getboyz track jacket sherman ben pacifier pics body glove pregnancy calendars medical transcriptionist holidays for single people lifeview video sca promotion destiney child ashley from o town homemade teen sex video inkjet 5 girl name top justice league cartoon truck accident lawyer office depot tucson www geometric figures jagged edge las vegas realestate add formula infant link suggest kustom trailer 6 girls hogtied stress leave in ontario avril lavigne signature cash loans riverside car sales stone mountain handbags jeenifer lopez video 1972 pontiac gto material handling plastic pallets off road motorcycle tire adelaide city council archives work input page kiss the girls movie trailer financing for real estate investors wood chips for fuel king arthur music video rice krispie treat zantrex 3 u.s. news and world report sin city 2005 soundtrack episode 3 trailer kid adidas wrestling shoes home alexis amore videos nero mp3 plugin nylon stockings porn best sex scene leaning pisa tower loan caculator honey bee sean paul we be burnin lyric free sample personal statements effects imitrex side winnie the pooh backgrounds and screensavers new weather zealand dress gothic style wedding worst case senario embossing label 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. Colbalt steel bits can work at higher temperatures than HSS.

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.

Solid tungsten carbide drill. Hard enough to drill through screw extractors.

Diamond powder drills are the hardest of all. Water is often required to avoid overheating.

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. (Not sure if this is the correct position for TiN coated drills on the list) 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.

See Also

The Drill bits and Drilling FAQ

Drill Bits