What's inside
As an Amazon Associate I earn from qualifying purchases. This post may contain affiliate links at no extra cost to you.
What we cover
Why Veneer Splinters When You Drill
Veneered plywood is two different materials in one. You have a thin hardwood face – often only 0.5mm to 1mm thick on cheaper sheets, up to 1.5mm on better Baltic birch – glued over alternating layers of softwood core. When a standard twist drill enters, its chisel point doesn’t cut the veneer, it pries it. The cutting lips grab the thin face grain and lift it before they can shear it cleanly. That is why splintering is almost always worse on the exit side, but you will also get chipping on entry if the bit is dull, too fast, or pushing too hard.
Grain direction matters. Drill within 1 inch of an edge or across the face grain and you increase tear-out risk by a lot. Cross-grain drilling lifts longer fibers. The glue line under the veneer also creates a failure point: once the bit breaks through the veneer, there is a tiny void or weak bond underneath, and the veneer has nothing solid backing it up at that micro-level.
Choosing the Right Bit Is Half the Job
For veneered plywood, do not use a standard black oxide twist bit if you care about the finish. It is ground for metal and has a 118-degree point that will skate, grab, and lift. You want a bit that scores the perimeter before it removes the center.
Brad point bits are the default choice for holes up to about 12mm (1/2 inch). The sharp center spur locates the hole without walking, and the two outer spurs score the circumference of the hole before the lips lift any material. That scoring action is what prevents the veneer from peeling. For larger holes, from 15mm to 50mm, a Forstner bit does the same thing with a continuous rim that shears the veneer cleanly.
| Bit Type | Best For | Splinter Risk on Veneer | Trade-off |
|---|---|---|---|
| Brad Point | 3mm – 12mm through-holes, dowel holes, hinge pilot holes | Low when sharp | Needs to be kept sharp; cheap sets dull quickly and then tear worse than twist bits |
| Forstner | 15mm – 50mm clean flat-bottom holes | Very low | Requires drill press or firm low-speed control; expensive per bit, slow to clear waste |
| Standard Twist (118-degree) | Metal, rough carpentry | High on entry and exit | Cheap and common, but will chip veneer even when new |
| Spade / Paddle Bit | Fast rough holes in framing | Very high | Fast but tears veneer aggressively; avoid for finish work |
| Hole Saw | 40mm+ holes for cables, lights | Medium to high | Needs scoring technique and backing board to be usable on veneer |
If you only buy one set for plywood furniture, get a quality set of brad point drill bits in 3mm to 10mm and add individual Forstner bits in the two or three sizes you actually use. Cheaper brad points are fine if you check the spurs with a magnifier – they should come to a sharp point, not rounded over. A dull brad point will splinter more than a sharp twist bit.
Drill Settings That Actually Prevent Tear-Out
Use a cordless drill, not an impact driver, for veneered surfaces. An impact driver delivers rotational impacts that make fine control impossible and will blow out the exit side even with a good bit. A hammer drill must have the hammer function turned completely off.
What matters is speed and feed pressure. For a 6mm brad point in hardwood veneer, 1,000 to 1,500 RPM is a good range. For a 35mm Forstner, drop to 500 to 700 RPM. Too fast burns the veneer and melts the glue; too slow and you will push harder, which increases lifting force on exit. Let the bit cut under light, constant pressure.
If your drill has an adjustable clutch, use it. A cordless drill with adjustable clutch set to a mid-range setting (around 10-14 on a 20-step clutch) will stall before it aggressively punches through and splinters the back face. You want to feel the moment the bit breaks through and ease off. Locking the drill on full torque and leaning your weight into it is the most common way beginners ruin a panel.
Techniques That Work Every Time
Score first. Even with a brad point, lightly scoring the veneer with a sharp marking knife or the tip of a utility knife on your layout lines gives the fibers a place to break cleanly. Make a shallow crosshair just deep enough to cut the face veneer, about 0.3mm deep. This takes 10 seconds and cuts splintering by more than half on cross-grain holes.
Tape helps, but not how most people think. Blue painter’s tape does not hold fibers down with much force. What it does is keep small chips from propagating into a long splinter and gives you a surface to mark clearly. Apply one layer, press it firmly with a fingertip to eliminate air bubbles, drill through it, and peel it back at a low angle after. For critical show faces, use two layers of tape or a single layer of clear packing tape which adheres better.
Always back up the exit side. This is the single most effective step. Clamp a sacrificial board tightly against the back of the plywood where the bit will exit. A scrap of MDF or flat softwood works best because it supports the veneer fibers right up to the cutting edge. If you cannot clamp, have a helper press hard with a flat block. Leave no gap – even a 0.5mm gap between the plywood and the backer lets the veneer flex and splinter. If you are drilling on sawhorses, move the panel so the hole is directly over a backer, not spanning open air.
Drill from the show face toward the back face whenever possible. If both faces will be visible, drill halfway from each side. Drill from the front until the brad spur just pokes through the back, flip the panel, and finish the hole from the back using that tiny pilot as a guide. The two cuts meet in the middle of the core and neither veneer face blows out.
For hole saws, run the saw backward for the first few seconds. At 300 RPM in reverse, the teeth scorer and abrade the veneer without grabbing it. Once you have a shallow 0.5mm groove, switch to forward to cut through. Combined with a clamped backer, this gives you a clean circle even with a coarse hole saw.
When to Sharpen or Replace the Bit
If you see dust instead of small shavings, or you need noticeable downward force to start the cut, the bit is too dull for veneer. Brad points cannot be easily sharpened with a standard drill doctor without ruining the spurs. For a 5-piece set that cost under $20, replace it. For premium Forstner bits, have them professionally sharpened or carefully hone the flat inside face of the rim with a small diamond file – never grind the outside diameter.
Resin buildup also mimics dullness. Plywood glue and heat leave a brown glaze on the cutting edges. Clean bits with isopropyl alcohol or a resin remover and a brass brush. A clean, sharp 6mm brad point should start a hole in oak veneer with almost no pressure and leave a crisp edge you can feel with a fingernail.
What Not to Use on Veneer
Do not use spade bits, auger bits with a screw tip, or hammer mode. A screw-tip auger pulls itself through aggressively and will lift a 10mm chip on exit before you can react. Spade bits have no scoring spurs and lever the veneer up. Impact drivers, even with brad points, create micro-impacts that fracture the thin face layer around the hole.
Also avoid holding the plywood by hand or with just your foot. Any vibration or flex while the bit exits increases tear-out. If you cannot clamp a backer, you will get splintering regardless of bit quality. For a quick fix on an installed cabinet side where you cannot access the back, stick a piece of scrap wood inside the cabinet and press it hard against the drilling point from the inside while you drill from the outside.