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Plywood Jigsaw Blade: Teeth, TPI, and the Blade That Cuts Clean
A plywood jigsaw blade decides whether a curve in a panel comes out clean or torn, and the choice comes down to teeth count, tooth shape, and the direction the teeth point. A fine-tooth blade with a downward tooth set cuts a plywood face without tear-out, while a coarse blade rips the veneer and leaves a rough edge that needs sanding. This guide covers the blade types for plywood, the TPI range that works, the tooth geometry that cuts clean, and the settings that keep a curve true in a full sheet.
Why the Blade Matters on Plywood
Plywood tears more easily than solid lumber at the cut, because the face veneer is a thin layer bonded over a core that offers little support at the edge. A coarse blade lifts that veneer before it cuts, and the result is a torn face that shows under any finish. A fine blade cuts the veneer cleanly, because the short teeth remove material in small passes rather than ripping it out.
The crosswise layers also change the cut. A blade that works well on a solid board may catch a layer in the plywood and deflect, so the blade for plywood wants a short, stiff body that holds the line through the cut.
The Tear-Out Problem
Tear-out happens on the face where the teeth exit the panel, and it shows worst on a clear or stained finish. A downward tooth set pushes the face down against the body of the panel, which holds the veneer flat while the cut passes through it. That single change is the difference between a clean curve and a face that needs filling.
Blade Types for Plywood
The blade families sort by tooth count and tooth shape, and each family suits a different cut in a plywood panel.
| Blade type | TPI range | Best for |
|---|---|---|
| Fine-tooth (downward set) | 18-32 | Clean curves, veneer faces |
| Medium-tooth | 10-14 | General cuts, thicker panels |
| Scroll blade | 20-32 | Tight curves, detail work |
| Reverse-tooth | 14-20 | Both faces clean |
Read the table with the finish in mind. A clear finish wants a fine or reverse-tooth blade, while a painted panel can run a medium tooth without the tear-out showing through the coat.
Fine-Tooth and Downward Set
A fine-tooth blade with a downward tooth set is the standard choice for a plywood face. The short teeth remove material in small chips, and the downward set holds the veneer flat against the body of the panel, so the cut stays clean on both sides.
Use this blade for curves in a cabinet side, a furniture panel, or any visible face. The cut is slower than a coarse blade, but the clean edge saves the sanding and filling that a torn veneer needs.
Scroll and Tight Curves
A scroll blade has a narrow body and fine teeth, which lets it turn a tight curve without binding in the cut. The narrow body also clears the kerf faster, so the blade stays cool through a long curve in a full sheet.
Keep the speed low on a tight curve, because a fast blade heats and dulls the teeth, and a dull fine blade tears the veneer just as a coarse one does. A slow, steady feed keeps the cut clean to the end.
TPI and the Cut Quality
TPI, or teeth per inch, sets how finely the blade cuts. A higher TPI gives a smoother edge, while a lower TPI cuts faster but leaves a rougher line. For plywood, the higher end of the range keeps the veneer intact.
Matching TPI to Thickness
A thin panel wants a high TPI blade, because the short teeth cut the veneer before it can tear. A thicker panel can run a medium TPI, because the core supports the face and the cut does not lift the veneer as easily.
Match the blade length to the panel thickness so the teeth stay in the cut through the full depth. A blade that bottoms out in the stroke wastes the last teeth and deflects at the end of the curve.
Settings and Technique
The blade sets the quality of the cut, and the technique keeps the curve true. Work the two together and the panel comes off the saw ready for assembly.
Speed and Feed
Run the jigsaw at a medium speed and feed the blade at a steady rate. A fast feed deflects the blade and opens the curve, while a slow feed lets the teeth dull against the same spot and burn the veneer.
Keep the base plate flat on the panel face, because a tilted base deflects the blade and widens the kerf. Support the offcut so the panel does not sag and pinch the blade at the end of the cut.
Clamping and Support
Clamp the panel flat before the cut, because a bowed sheet lifts under the blade and tears the face. Support the cut line with a straightedge when the curve runs long, and the blade follows the line without wandering.
Score the cut line with a sharp knife before the blade runs, because the score holds the veneer down at the edge and stops the first tear that a blade starts on a clean face.
Blade Depth and the Stroke
Set the blade depth so the teeth clear the panel at the bottom of the stroke. A blade that bottoms out in the stroke wastes the last teeth and deflects at the end of the curve, while a blade that is too long for the panel wastes the upper teeth and heats in the cut.
Check the stroke length against the panel thickness before the first cut. A full-depth stroke clears the kerf and keeps the cut true, while a partial stroke leaves the blade in the cut and deflects on the curve.
Changing the Blade Mid-Cut
Stop the saw and let the blade cool before a change, because a hot blade burns the plywood face when it re-enters the cut. Restart the cut at the kerf and feed slowly for the first few millimeters, so the new teeth re-cut the line without lifting the veneer.
Keep a spare fine blade on the bench, because a dull blade tears the face just as a coarse one does, and the tear shows under a clear finish long after the cut is done.
Blade Materials and Coatings
The blade body and the tooth coating set how long the cut stays clean. Bi-metal blades flex and hold the teeth, while carbide-tipped blades cut longer before the edge dulls on a dense core.
Bi-Metal and Carbide
A bi-metal blade has a flexible body and hard teeth, which lets it turn a curve without snapping and hold an edge through a full sheet. A carbide-tipped blade lasts longer in a dense panel, because the carbide edge resists the heat that dulls a steel tooth.
Choose bi-metal for general curves and carbide for a long run in a film-faced or dense panel. The cost difference pays for itself in a cut that stays clean to the end of the sheet.
Which Blade for Which Cut
The cut decides the blade. A clean curve in a visible face wants a fine, downward-set blade, while a rough cut in a back panel can run a medium tooth.
- Clean curves in a visible face: fine-tooth, downward set.
- Tight curves and detail work: scroll blade.
- Both faces clean: reverse-tooth blade.
- General cuts in a thick panel: medium-tooth blade.
- Rough cuts in a back panel: coarse blade, no finish needed.
Frequently Asked Questions
Short answers to the blade questions that decide a plywood cut.
What TPI jigsaw blade for plywood?
A high TPI between 18 and 32 keeps the plywood face clean, because the short teeth remove material in small chips rather than tearing the veneer. Use the higher end for a thin panel and the lower end for a thicker one, and match the blade length to the cut depth.
Which direction should jigsaw teeth point for plywood?
Point the teeth down, toward the body of the panel. A downward tooth set holds the face veneer flat against the panel while the cut passes through it, which stops the tear-out that shows on a clear or stained finish.
Why does my jigsaw tear the plywood face?
The blade is either too coarse, the teeth point up, or the feed is too fast. Switch to a fine, downward-set blade, feed the cut at a steady rate, and score the line with a knife before the blade runs. The three changes together stop the tear on a plywood face.
For panels that cut clean under a fine blade, HYY supplies Commercial Plywood and Film Faced Plywood with stable faces that hold a clean edge under a saw curve, so the cut comes off the tool ready for the next step.