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Subject: drill bits

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Al in texas    Posted 12-22-2018 at 12:44:08 [URL] [DELETE]        [Reply] [Email]  
  • drill bits
  • Please help I need a source for hi quality drill bits, tired of replacing bits after 2 or 3 holes in mild steel.
    Thanks in advance Al

    Al    Posted 12-23-2018 at 07:45:20 [URL] [DELETE]        [Reply] [Email]  
  • Re: drill bits
  • Thank you Dan and Tim for the quick response and good advice
    Al

    Farmer Dan    Posted 12-22-2018 at 14:06:46 [URL] [DELETE]        [Reply] [Email]  
  • Re: drill bits
  • its been my experience that all drill bits are made the same. only difference is the steel they are made of. Buy carbide steel bits and a Drill Doctor. The carbide will out last titanium and all the other and when they do get dull you can resharpen them instead of throughing them away. Use 116 degree angle if using a hand drill. 135 if using a drill press or lathe.

    Tim Daley(MI)    Posted 12-22-2018 at 14:46:56 [URL] [DELETE]        [Reply] [No Email]  
  • Re: drill bits
  • Yes, quality cobalt steel is the key to HSS drills. Carbide will be expensive, but not needed on softer material. Titanium is just the coating to provide longer tool life. It was originally used on CNC tools that required the use of coolant like soluble oil when used. They don't make solid titanium drills. The drill point is important for the type of material you are cutting too. For most applications, a standard 118 included angel drill point will work fine. For a more precision hole, carbide is best, and with a 135 included angle point, and when drilling hardened steel. A parabolic carbide drill with a 140 included angel drill point is even more precise, especially for deep holes. Carbide is extremely brittle and less forgiving than HSS. If the tool and the workpiece are not solidly secure, the carbide will chip or break. You should never use carbide in a hand held drill unit. It will almost surely chip or break. Always use carbide in a secure solid setup on a drill press. Sharpening carbide drills requires a different grinding wheel too.

    Tim Daley(MI)

    Tim Daley(MI)    Posted 12-22-2018 at 13:37:42 [URL] [DELETE]        [Reply] [No Email]  
  • Re: drill bits
  • he Industrial Tool supply houses will stock quality tools -try MSC. The bargain house variety, cheena made crap is just that. For most applications in mild steel, non-hardened, HSS, TiN coated will work. The drill point is important too -got a good sharpening device? 118 drill point is standard. For harder materials, use a 135 Parabolic Carbide Drill. Drill/tool failure is caused by four things: 1) the wrong tool/drill itself; 2) the workpiece material; 3) the machine itself; and 4) the setup of the machine. What is your application? Are you hand drilling or using a lathe?

    Tim Daley(MI)

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