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Acrylic is easy to drill once the bit and technique are right. The difficulty is that it is rigid and brittle: an ordinary twist bit can grab as it breaks through, leaving a chipped edge or a crack that travels across the sheet. For most clean, accurate holes, choose a plastic-cutting drill bit or a sharp brad-point bit, use a steady low speed, and support the material close to the hole.
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Which drill bit works best?
Acrylic-specific bits have a point and cutting geometry designed to scrape or shave plastic without pulling the bit aggressively into the sheet. They’re a good buy if you’ll drill several holes, work with expensive panels, or need repeatable results. Look for bits described for acrylic or plastic, rather than assuming every bit labeled “plastic” suits every job. A set of acrylic and plastic drill bits is a practical choice when you need more than one hole size.
A sharp brad-point bit is a capable, often cheaper option for occasional holes. Its center spur helps locate the hole, and the outer spurs score the edge before the cutting lips remove material. Use a bit that is genuinely sharp; a worn wood bit can rub, heat the acrylic, and leave a rough hole. A brad-point bit set is fine for a small DIY project if you test it on scrap first.
A standard twist bit can work, especially on thin sheet, but it is more likely to catch at breakthrough. If that is all you have, use a sharp bit, slow the drill, and reduce pressure as the tip nears the far side. Avoid hammer-drill mode, masonry bits, and impact-driver bits or modes. Hammering and impact can shock the sheet instead of cutting it cleanly.
Bit types at a glance
| Bit type | Best use | Trade-off |
|---|---|---|
| Acrylic or plastic bit | Several holes, larger holes, or a cleaner finish | Costs more than a basic twist bit; check the stated material use |
| Brad-point bit | Occasional small or medium holes in supported sheet | Can grab or chip if dull or pushed too hard |
| Standard twist bit | One or two holes when you already own a sharp bit | Greater chance of grabbing at breakthrough |
| Hole saw | Large openings for fittings or cable pass-throughs | Needs careful control and firm backing; can generate heat quickly |
Speed, drill, and hole size
Use a cordless drill set to its low gear and keep it in drill mode. The clutch can help prevent a sudden wrist twist if the bit catches, but do not rely on it to protect the sheet. Start with a light trigger and a moderate-to-low speed; the right pace depends on bit diameter, sheet thickness, and the drill. A useful starting point is roughly 500–1,000 rpm for small bits, then slower for larger holes. If the acrylic starts to soften, smear, or collect melted plastic on the bit, stop and let it cool.
Large holes need extra caution. A hole saw is more prone to snag than a small drill bit, so hold the drill square and use low speed with light, steady feed pressure. A drill press makes it easier to keep a hole perpendicular, but a cordless drill is adequate for ordinary household work. Do not use an impact driver: its short bursts of torque make controlled cutting harder.
Set up the sheet to prevent cracks
Leave the protective film on both sides if it is still in place. It reduces surface scratches and helps limit chipping. Clamp the acrylic between flat scrap boards or place it on a flat sacrificial backer, then clamp the stack securely. Support the area around the hole; an unsupported sheet can flex, vibrate, and crack. Keep clamps clear of the drilling path and do not overtighten them enough to bow the panel.
Mark the center on the film, or use a small piece of masking tape if the film has been removed. A center punch can create a crack, so avoid striking one into acrylic. For holes near an edge, leave enough material around the hole: as a practical starting point, keep the hole center at least two hole diameters from the edge. More distance is safer for brittle sheet or a large hole.
A controlled drilling method
Fit the bit securely and check that it runs straight. Hold the drill square to the sheet, start slowly, and let the cutting edge do the work. Apply only enough pressure to make steady progress. Too much pressure can flex the panel or force the bit through suddenly. As the tip approaches the backer, ease off; breakthrough is when many chips and cracks begin.
For a hole larger than about 1/4 inch, you can first drill a small pilot hole, around 1/8 inch, then enlarge it with the final bit. This helps locate the hole, but a pilot hole does not compensate for poor support or a dull bit. For a very large opening, consider stepping up through sizes rather than jumping straight from a tiny pilot to a hole saw.
After drilling, remove the backer and clear loose chips. If the hole edge is rough, lightly deburr it by hand with fine sandpaper or a countersink turned gently by hand. Do not run a countersink at high speed; it can grab and enlarge the opening unevenly. Avoid tightening a screw directly against acrylic. Use a washer and leave a little clearance so the sheet can expand and contract without stress.
What to buy for your project
For a few small holes in scrap or inexpensive sheet, a sharp brad-point bit is usually enough. If a clean finish matters, the panel is costly, or you need several diameters, choose a dedicated acrylic bit set. Buy sizes that match the hardware rather than drilling a tight hole and forcing a screw through it; the screw’s stress can start a crack later.
For large openings, use a hole saw rated for plastic where possible, and test the setup on offcut material. The cheaper option is fine when the hole is small and the consequences of a slightly rough edge are minor. For visible work, close-to-edge holes, or a panel that cannot be replaced easily, spend a little more on the correct bit and take time to support the sheet. That combination matters more than buying an expensive drill.