Symptoms
- Bit slides across the surface before starting a hole
- Hole ends up off-center from the marked spot
- Bit skips or chatters at the start of drilling
- Scratched marks around the intended hole location
Likely causes
- CommonNo starter dent to guide the bit tipOn hard or smooth surfaces, a bit needs a small indentation to prevent wandering.
- CommonDull drill bitA dull tip doesn't bite cleanly and tends to skate instead of cutting in.
- PossibleDrilling at an angle instead of perpendicular to the surfaceStarting at an angle makes the bit slide sideways before it can grip.
- Less commonExcessive drill speed for the starting phaseToo high a speed at first contact reduces control and increases wandering.
What to do
- Mark the exact hole location clearly with a pencil or scribe.
- Use a center punch and hammer to create a small dent at the mark on metal, or a nail and light tap on wood, to guide the bit tip.
- Confirm the drill bit is sharp; a dull bit should be sharpened or replaced before continuing.
- Start the drill at a slow speed with the bit held perpendicular to the surface, applying light pressure until the tip engages fully.
- Increase speed and pressure only once the bit has established a clean starting hole.
- For very hard or slick surfaces, use a spotting or stub drill bit designed specifically to start holes accurately.
- Keep the drill steady and aligned throughout, checking angle periodically on longer holes.
Tools and parts
- Center punch
- Hammer
- Sharp drill bits
Replacement drill bit setSearch: “drill bit set for metal or wood”
When to call a pro
Not typically a professional job; a machine shop can drill precise holes in metal if accuracy requirements exceed hand-drilling capability.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.