Twist drill bits are a hand tool accessories used for drilling material like masonry, wood and sheet metal to create holes. Twist Drill bits are used in conjunction with a power drill and are readily available in various shapes and sizes depending on the material being drilled.
Types of Twist Drill Bits
Jobber drill bit
Long drill bit
Short drill bit
Stub drill bit
Morse Taper drill bit
Self-centring drill bit
What material can they cut?
They can cut through many forms of material, it’s a question of having the correct drill bit, however typical materials include;
Wood
Plastics
Aluminium
Brass
Cast iron
Mild steel
How do they work?
Insert the drill bit into a corded or cordless power drill at the chuck, tighten until it’s held in place then select the required torque setting. Hold the power drill with both hands securely, apply some pressure then start drilling,
How do you know which type of Twist Drill Bits to use?
It is important to have the correct drill bit when cutting holes. When making a considered purchase there a few things you need to consider; the material being cut, the material & coating of the drill plus the geometry.
Drill point angle
There are 2 general types; 118 ° that drill mild steel aluminum and other soft metals or 135 ° that drills hard steel and tough materials.
What are their strengths?
HSS drill bits are basic, inexpensive and easy to re-sharpen
HSS drill bits with Cobalt are an improvement on HSS, offer greater resistance to heat and wear but is also easy to re-sharpen
Carbide drill bits are the most expensive, usually, give the best heat resistance and last the longest.
When should I sharpen my drill?
As a rule, if your holes are in tolerance and wear & chipping are below 0.5 mm it’s typically ok to keep using your drill, anything after that you need to consider replacing or sharpening.
Popular Coating
Bright finish
Black oxide
Titanium Nitride (TiN)
Titanium Carbon-Nitride (TiCN)
Titanium Aluminum Nitride (TiAIN)
Safety
Proper eye protection must be worn at all times
Only use drills bits made for power tools
Keep hands away from drills bits during application
Applications Information
Twist drill bits are used in Industrial construction, servicing & maintenance applications.
