How to Drill Clean Holes in Plywood

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Why plywood tears around a hole

Plywood is made of thin wood layers, with the grain in adjacent layers running in different directions. That construction makes it stable, but the face veneer can chip when a bit pushes through instead of cutting cleanly. Tear-out is most likely on the exit side, where the remaining veneer has little support.

The fix is usually simple: use a sharp bit suited to the hole, support the back of the panel, and ease off as the bit exits. A powerful drill won’t compensate for a dull bit or poor support.

Choose the right bit for the hole

For common screw-clearance and pilot holes, a sharp brad-point bit is easy to control. Its center point helps keep the hole on location, while the outer spurs score the veneer before the cutting edges remove material. A standard twist bit works for general-purpose holes, but it is more likely to wander or chip the face veneer, especially if it is dull.

For holes wider than about 1/2 inch, a Forstner bit can make a flat-bottomed, clean-sided hole, but it needs steady pressure and a securely clamped workpiece. A hole saw is often the practical choice for larger through-holes; expect more cleanup than with a Forstner bit, and back up the panel to reduce exit tear-out. For large, rough openings hidden by hardware, a spade bit may be cheaper and good enough, but it is more prone to splintering.

If you need a bit for repeated clean holes, compare brad-point drill bit sets. A basic set is usually sufficient for furniture and shelving work; premium bits are easier to justify for frequent use or demanding joinery.

Mark, clamp, and support the panel

Mark the hole center with a pencil, then make a small starter mark with an awl if the bit tends to skate. Clamp the plywood to a stable bench or sawhorses. Keep the clamp clear of the drill path, and don’t hold a small piece in your hand while drilling.

For a through-hole, place a flat scrap board snugly against the underside and clamp both layers together. The scrap supports the exit veneer as the bit passes through. A piece of scrap on top can also help on delicate, thin veneer, but with a brad-point bit it is often unnecessary if the bit is sharp and the work is steady.

If drilling a finished panel, use painter’s tape over the mark to reduce surface scuffing and help you see the layout. Tape is not a substitute for a backer board, and it won’t prevent tear-out if you force the bit through.

Drill at a controlled speed

Use a regular drill or a drill-driver in its drilling setting. A hammer drill’s impact action is for masonry; leave hammer mode off for plywood. An impact driver can turn suitable hex-shank bits, but its rapid impacts make fine control harder. For clean holes, a regular drill is the better tool when available.

For small bits, start around 1,000–2,000 rpm if your drill has a variable-speed trigger. Larger bits generally need slower speed: roughly 500–1,000 rpm is a sensible starting range for many 1/2- to 1-inch bits. These are guidelines, not fixed rules; follow the bit maker’s limits, and reduce speed if the bit chatters, smokes, or feels hot. Keep the drill square to the panel, use steady pressure, and let the cutting edges do the work.

When making a through-hole, slow down as the center point approaches the backer. Stop if the bit starts to grab. For a thick panel or a hole saw, drilling partway from one face and finishing from the other can help, but only if you can accurately align the two marks. Otherwise, a firmly clamped backer is simpler.

For pilot holes and fasteners

When drilling a pilot hole for a screw, choose a bit close to the screw’s solid core diameter—the shaft thickness excluding the threads. In softwood plywood, a pilot bit around the core diameter often works; for hardwood-faced plywood or screws near an edge, a slightly larger pilot can reduce splitting. Test on an offcut when the fit matters. The hole should guide the screw without making its threads lose their grip.

For a blind hole, wrap tape around the bit at the required depth as a visual stop, or use an adjustable depth stop. Measure from the drill point, not just the bit’s cutting edge, and test the depth on scrap. This is especially important when the far face is finished or a screw must not break through.

If a screw will go into plywood too thin to hold securely, don’t assume a wall anchor will solve it. Most wall anchors are designed for drywall or masonry, not layered wood. Choose a fastener suited to the panel and the load, and add a backing block or through-bolt when the connection needs more strength.

Fix common problems

Bit wanders at the start: Use a brad-point bit, make a small center mark, and start slowly. A twist bit is more likely to skate across a smooth face.

Veneer chips on the back: Clamp a scrap backer directly beneath the panel, slow down near breakthrough, and check that the bit is sharp. A chipped exit often means the bit was pushed through too fast or the panel was unsupported.

Hole is ragged or scorched: Clear packed chips from the flutes, reduce pressure, and use a sharp bit. Scorching usually points to excessive friction from a dull bit, high speed, or forcing a large bit through too quickly.

Bit grabs or the panel shifts: Stop the drill, secure the work, and reduce pressure. Large bits and hole saws can catch suddenly, so keep both hands on the drill and clamp the panel rather than trying to restrain it by hand.

For occasional holes, a sharp general-purpose bit and a scrap backer are usually enough. If you regularly drill larger openings, a purpose-made Forstner bit set can improve the finish, but it costs more and still requires careful clamping and speed control.