A: Choosing a drill bit depends mainly on two key factors: the type of material being drilled and the required hole size.

Material type:

Wood: Use a twist drill bit (most common, with a pointed/split tip) or a flat drill/carpenter drill bit (for drilling large holes or thin plates).
Metal: Use a high-speed steel drill bit or a cobalt alloy drill bit. HSS is suitable for general steel and non-ferrous metals (such as aluminum and copper), while cobalt alloy is harder and more resistant to high temperatures, suitable for stainless steel and hard steel.
Masonry/concrete: Carbide drill bits or diamond drill bits must be used. They usually have specially designed carbide tips (such as chisel drill bits need to be used with impact drills/electric hammers).
Tile/glass: Use a special tile drill bit or a diamond-coated/ground drill bit, usually in an arrow or spear point shape, to avoid impact mode.

Hole size: Choose the appropriate drill bit size according to the diameter of the hole you need to drill. The drill bit shaft is usually engraved with a diameter mark.

A: These problems are usually related to operating skills, drill bit status or tool settings:

Slipping/running off:
Positioning: Use a center punch to knock a small dimple in the center of the hole to give the drill an initial positioning point.
Verticality: When starting to drill, make sure the drill bit is perpendicular to the workpiece surface and start at a low speed to apply steady pressure. An auxiliary positioner can be used.
Drill bit sharpness: Blunt drill bits are more likely to slip. Check and replace or sharpen the drill bit.

Stop drilling/get stuck:
Speed ​​and pressure: The harder the material and the larger the drill bit diameter, the lower the speed should be, but the feed pressure should be sufficient and stable. Too fast or insufficient pressure will cause frictional heat and burn the drill bit.
Cooling: When drilling metal, use cutting fluid (such as engine oil, special coolant) or frequently pause to cool down to prevent the drill bit from overheating and annealing and softening.
Chip removal: Regularly withdraw the drill bit to remove debris in the hole to prevent clogging and overheating or jamming. This is especially important for deep holes.
Drill bit selection: Confirm that the drill bit material and type are suitable for the material to be drilled (for example, using a wood drill bit to drill metal will definitely not work).

Tool power: Make sure the electric drill/bench drill has enough power (torque) to cope with the hole diameter and material.

A: Good maintenance can significantly improve the performance and life of the drill bit:

Cleaning: Remove debris (metal chips, wood chips, dust) from the drill bit immediately after use, especially in the groove. It can be cleaned with a brush or compressed air. Avoid the hardening of debris and affect the next use.

Rust prevention: After cleaning, apply a small amount of light engine oil (especially for high-speed steel drill bits) or wrap it with anti-rust paper and store it in a dry place. Humid environments are prone to rust.

Avoid overheating: When drilling, pay attention to controlling speed and pressure, use coolant (metal), and exit and remove chips in time. Overheating is the main reason for the drill bit to become blunt or even annealing failure.

Proper storage: Use drill boxes, holders or rolls to store drill bits to avoid collisions that may cause damage or deformation of the cutting edge. Store by size or type for easy access.

Timely grinding/replacement: When it is found that drilling is laborious, smoke is emitted, the edge of the hole is uneven, and the cutting edge of the drill bit is obviously worn or broken, it should be promptly ground with a drill grinder or replaced with a new drill bit. Forcibly using a blunt drill bit will damage the workpiece and tool.

A: Safety always comes first:

Wear goggles: This is absolutely necessary! The debris (especially metal chips) generated by drilling splashes at high speed and can easily hurt the eyes.

Fix the workpiece: Use tools such as vises, clamps or C-clamps to firmly fix the workpiece on the workbench. Drilling with a handheld workpiece can easily cause the workpiece to rotate or be thrown out due to the bit biting, causing serious injury.

Remove jewelry/be careful of long hair clothing: Take off watches, rings, bracelets, etc., tie up long hair, and prevent loose clothing, gloves or ties from being caught in the rotating drill bit or workpiece.

Check the power supply and tools: Before using power tools, check whether the wire is damaged and the plug is intact. Make sure the electric drill switch is flexible and the chuck (chuck) is not loose when clamping the drill bit.

Concentrate: Pay full attention during operation and do not be distracted. Make sure the work area is well lit, clean and free of tripping hazards.

Follow tool instructions: Understand and follow the operating manual and safety guidelines of the electric drill/bench drill you are using, especially regarding speed settings and impact mode (only masonry drill bits are used on impact drills/electric hammers).

Handle sharp edges: After drilling, the edges of the hole or metal workpiece may be sharp, handle them carefully to avoid cuts