DeWalt DW735 Planer Upgrade Guide: Blade Options Compared, Spiral Cutterhead Performance, and Honest Motor Advice

The DeWalt DW735 is among the most popular 13-inch benchtop planers available. Its main weakness is the stock straight knife system: it dulls faster than expected, nicks easily on hardwoods, and produces tearout on figured grain that technique cannot eliminate. This guide covers every blade option, what changes with a spiral cutterhead, and an honest answer to the motor overload concern that appears in every forum discussion on this topic.

The DW735's Main Weakness: Blade Life and Surface Quality

The DeWalt DW735 ships with a three-knife high-speed steel cutterhead. The stock blades are reversible and reasonably easy to change, but they have two significant limitations that every DW735 owner encounters eventually.

The first is edge life. OEM DW735 blades nick and dull faster than most woodworkers expect, particularly on dense hardwoods like hard maple, hickory, and exotic species. A single pass over a board with an embedded staple or a piece of sand-contaminated reclaimed lumber can nick a knife enough to leave a visible ridge on every subsequent board. Once a knife develops a nick, the only options are replacing the blade set, resharpening by a professional grinding service, or living with the ridge and sanding it out.

The second limitation is surface quality on difficult grain. The three-knife system strikes the full board width simultaneously on every revolution. On straight-grained softwoods and mild hardwoods, this produces acceptable results. On figured maple, walnut with interlocked grain, cherry with wavy figure, or quartersawn oak, the simultaneous full-width impact lifts fibers oriented against the cutting direction, producing tearout that is difficult to eliminate regardless of depth of cut or feed direction. This is not a flaw in the DW735 specifically - it is the inherent limitation of straight knife cutterhead geometry.

DW735 Blade Options Compared

Every DW735 owner eventually faces the same decision: replace the worn knives with the same type, or upgrade to something better. There are four meaningful options, each with a different performance-to-cost tradeoff.

The table makes clear that the upgrade path follows a predictable curve: better performance comes with higher upfront cost but lower long-term maintenance burden. OEM blades are the cheapest per set but the most expensive over time due to frequent replacement. The spiral cutterhead has the highest upfront cost but the lowest long-term cost for a shop that processes significant hardwood volume.

OEM DeWalt Replacement Blades

The stock OEM blades are double-edged and reversible. When one edge dulls, flipping the blade exposes the fresh side. When both sides are dull, the set is discarded. Blade changes on the DW735 require removing a top cover panel, loosening a series of torx screws on each knife's gib bar, lifting out the knife with the magnetic tool DeWalt supplies, and reversing the process with the new blade. The procedure takes 20 to 30 minutes per set with practice. The limiting issue is that OEM DW735 blades have a reputation for inconsistent quality and short edge life, particularly on hardwoods and any wood with abrasive contamination.

Aftermarket HSS Blades

Several aftermarket suppliers produce HSS replacement blades for the DW735 that are thicker and harder than the OEM versions. Infinity Tools and Woodcraft both offer well-regarded DW735 blades that many users report lasting noticeably longer than the OEM equivalent on identical stock. The improvement is incremental rather than transformative, and the same fundamental limitations of straight knife geometry apply.

Carbide Tipped Straight Knives

Carbide tipped straight knives for the DW735 use a steel body with a tungsten carbide cutting edge. The carbide edge holds up significantly longer than HSS on dense hardwoods and abrasive materials. Some users report processing three to five times the board footage before noticing performance degradation compared to OEM HSS. When carbide tipped knives eventually dull, they require professional grinding rather than simple replacement, which adds a service cost that narrows the long-term advantage over high-quality HSS blades.

Spiral Carbide Insert Cutterhead

A spiral carbide insert cutterhead replaces the entire three-knife drum with a new cylinder carrying 40 square carbide inserts arranged in a helical pattern. This is not a blade upgrade - it is a cutterhead replacement that changes the fundamental cutting geometry of the machine. The performance difference is not incremental. It eliminates the tearout problem on difficult grain rather than reducing it, and it replaces the blade-change maintenance cycle with a simple insert rotation that takes seconds.

See more: Wood Planer Blades: 4 Types Compared and When to Upgrade

What Changes With a Spiral Cutterhead on the DW735

Upgrading the DW735 to a spiral cutterhead changes the machine's behavior in four measurable ways. Not all of these are equally significant for every woodworker, but the combination is why this upgrade has become the most commonly recommended modification for the DW735 in woodworking communities.

Surface Quality and Tearout

The most significant change is on figured and difficult-grain hardwoods. Hard maple with tight curl, walnut with interlocked grain, cherry with wavy figure - these are the species where straight knife machines consistently produce tearout despite correct technique. With a spiral cutterhead, each insert engages a small section of the board width at a slight skew angle, shearing fibers rather than impacting them across their full width simultaneously. Woodworkers who have processed curly maple through both a straight knife DW735 and a spiral-equipped DW735 consistently report that boards which required significant sanding after straight knife passes come off the spiral machine needing only light finish sanding or none at all.

Noise Reduction

The DW735 is a noticeably loud machine. The stock three-knife cutterhead produces a loud chopping sound as each knife strikes the full board width three times per revolution at high RPM. The spiral cutterhead staggers the insert engagement so only a fraction of the cutting edges are in contact at any moment. The resulting sound is a lower-pitched hum rather than a high-frequency chop. The reduction is real but should not be overstated. The DW735's blower fan contributes significantly to its overall noise level and is unchanged by the cutterhead upgrade. Hearing protection is still required.

Maintenance: No More Knife-Setting Sessions

Knife changes on a straight knife DW735 require 20 to 30 minutes, proper torque sequencing, and height verification after installation to ensure all three knives are at the same height. Inconsistent knife heights cause vibration and uneven cutting. With a spiral cutterhead, insert maintenance means loosening one torx screw per insert, rotating the insert 90 degrees to expose a fresh cutting edge, and retightening. Individual inserts can be addressed as they dull rather than replacing the entire set simultaneously.

Chip Size and Dust Collection

Spiral cutterheads produce shorter, finer chips than straight knife machines. The straight knife system severs long ribbons of wood that can clog flexible dust collection hoses or bag filters quickly. The spiral system's smaller chip output travels through dust collection more easily and requires less frequent bag emptying. For shops running the DW735 connected to a dust collector, this difference is noticeable in session duration before collection efficiency degrades.

Addressing the Motor Concern Honestly

The most consistent concern raised in DW735 upgrade discussions is whether a spiral cutterhead overloads the machine's motor. This concern deserves a direct and honest answer rather than a dismissive reassurance.

What the Forums Say

Forum discussions on this topic, particularly at Sawmill Creek and FineWoodworking, include accounts of DW735 owners who installed spiral cutterheads and subsequently experienced circuit breaker trips, motor overload switch activations, and in a small number of cases, motor failures after extended heavy use. These accounts are real and should be taken seriously. The DW735's motor was engineered around the three-knife straight knife cutterhead. The spiral cutterhead presents a different load profile to the motor, and under aggressive use conditions, it can exceed the motor's designed operating range.

The Depth-of-Cut Solution

The motor overload concern is primarily associated with deep cuts and high-volume production sessions. The DW735 manual specifies a maximum depth of cut of 1/8 inch per pass with the stock cutterhead. With a spiral cutterhead, limiting passes to 1/16 inch or less per pass eliminates the motor loading problem in virtually all reported cases. Woodworkers who have run spiral-equipped DW735 machines for multiple years without motor issues consistently use light passes. Operating with light, consistent passes - which produces better surface quality anyway - is both the correct technique and the protection for the motor.

Who Should and Should Not Upgrade

The spiral cutterhead upgrade is well-suited for home shop woodworkers processing hardwoods at typical home shop volumes: 20 to 60 board feet per session, with adequate rest time between extended runs. It is less appropriate for woodworkers who regularly push the DW735 through very aggressive material removal at high volume. For that level of use, a floor-model planer with a larger motor is the more appropriate machine regardless of cutterhead type.

See more: Wood Tearout: What Causes It, How to Prevent It by Tool Type, and When to Upgrade Your Cutterhead

Upgrade or Buy a New Planer? The Decision Framework

The combined cost of a DW735 plus a Sheartak spiral cutterhead approaches $800 to $950 depending on current pricing. A new benchtop planer with a spiral cutterhead factory-installed runs $600 to $900. This cost proximity raises a legitimate question: is upgrading the existing DW735 the right move, or is buying a new spiral-equipped machine a better use of the money?

For most DW735 owners with a machine in good condition who regularly work with hardwoods and figured grain, upgrading the cutterhead delivers the best combination of performance improvement and cost efficiency compared to the alternatives.

See more: Planer or Jointer First? The Honest Answer and Buying Guide

Installation Overview for the DW735 and DW735X

The spiral cutterhead installation on the DW735 is a DIY-accessible procedure that takes approximately one to two hours on a first attempt, less on subsequent installations. It requires basic mechanical comfort and patience with the insert installation step, which involves placing and torquing 40 individual carbide inserts into their seats.

Tools Required

The installation requires a torx driver set, a bearing puller or press (if replacing bearings), basic hand tools, and access to the installation manual and video provided by Sheartak. The cutterhead ships with the inserts removed, which means the first task after removing the old cutterhead is installing all 40 carbide inserts into their seats before the new head can be tested. This insert installation step is time-consuming but straightforward.

Bearing Decision

The DW735's original bearings are pressed onto the cutterhead shaft. Removing the old cutterhead requires pulling these bearings, which may damage them in the process. Sheartak recommends having replacement bearings on hand before beginning the installation. The replacement bearings are available from Sheartak (NSK, SKF, NTN, or equivalent premium bearings) and are the correct specification for the DW735 shaft diameter. Attempting to preserve and reuse original bearings is possible if they are in excellent condition, but planning for replacement eliminates a potential mid-installation complication.

DW735X Compatibility

The Sheartak spiral cutterhead fits both the DW735 and the DW735X. The DW735X is the DW735 with factory-included infeed and outfeed extension tables; the cutterhead dimensions and mounting points are identical between the two models.

Upgrade your DW735 with a direct-fit spiral cutterhead: Sheartak Spiral Cutterheads

Conclusion

The DeWalt DW735 is held back by its straight knife cutterhead. Carbide tipped blades extend maintenance intervals but do not change the cutting geometry. A spiral insert cutterhead eliminates tearout on difficult grain, reduces maintenance to insert rotation, and transforms hardwood performance. The motor concern is manageable with light passes. For a DW735 in good condition at home shop volumes, the spiral cutterhead upgrade delivers the most impactful performance gain available.