DeWalt DCS578 vs Makita XSH07: Which Cordless Circular Saw Handles Thick Timber Better?

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The DeWalt DCS578 and Makita XSH07 are both 7-1/4-inch, 18V cordless circular saws built for demanding framing and cutting work. Each can make a nominal 2-5/8-inch-deep cut at 90 degrees, enough to get through 2-by material in one pass. Their real test is thicker stock: dense hardwood, wet lumber, or a cut that pushes close to the blade’s full depth.

For that work, the DCS578 has a modest edge in available cutting depth and a useful advantage if you already own DeWalt’s 60V FlexVolt batteries. The XSH07 is a capable alternative, especially for Makita users, but its 18V platform can run out of steam sooner under a sustained heavy feed. Neither saw turns a slow, controlled cut into a fast one. Blade choice, battery condition, and letting the motor maintain speed matter just as much.

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#1 Pick

DEWALT FLEXVOLT 60V MAX* Circular Saw with Brake, 7-1/4-Inch, Tool Only (DCS578B)

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#2 Pick

DEWALT FLEXVOLT 60V MAX* Circular Saw with Brake Kit, 7-1/4-Inch (DCS578X1)

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#3 Pick

DEWALT FLEXVOLT 60V MAX* Circular Saw for Framing, 7-1/4-Inch, Tool Only (DCS577B)

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#4 Pick

DEWALT FLEXVOLT 60V MAX* Circular Saw Kit, 7-1/4-Inch, Worm Style, 9.0Ah Battery (DCS577X1)

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The key differences

Published depth figures can vary slightly with blade and shoe setup, so check the manual before relying on the last fraction of an inch. Both saws have enough capacity for a standard 2-by-12 cut at 90 degrees, though a bevel or a blade with reduced effective diameter changes the calculation. A full-depth pass through thick stock also leaves little room for error: the blade must clear the material without the motor being forced to crawl.

How they handle thick timber

The DCS578 uses DeWalt’s 60V FlexVolt battery system, which can supply substantial power for a high-load cut. That helps when a sharp blade is buried in dense timber and the saw is asked to maintain speed. It is not permission to shove the saw forward. If the blade slows, ease off and let it recover; forcing the shoe ahead can overheat the motor, trip battery protection, or pinch the blade as the cut closes.

The XSH07 draws from two 18V LXT batteries, giving the saw a higher-voltage setup than a single-battery 18V tool. In clean framing lumber it cuts confidently, and for occasional thick cuts it is more than adequate. Under repeated, long cuts in hardwood or wet, knotty stock, a drop in blade speed is more likely to become the limiting factor. Use a sharp blade and keep the cut line clear of packed sawdust; a dull or clogged blade can make either saw feel underpowered.

For a single 2-by-10 or 2-by-12 cut, the difference is unlikely to decide the job. The tougher comparison is repeated cutting near maximum depth, especially at a bevel. At 45 degrees, neither saw can cut as deep as it can square-on, so verify the bevel capacity against the actual timber rather than assuming a 90-degree rating applies. If the material is thicker than one pass allows, use a track or straightedge and make a controlled second cut from the opposite face, or choose a larger saw.

Battery cost, weight, and runtime

Battery compatibility may settle the choice before cutting performance does. The DCS578 requires a compatible FlexVolt battery; the XSH07 uses two compatible 18V LXT packs. If you already have batteries and a charger in one system, staying with it can save more than any small difference in saw price. If you are buying into a platform, include the cost of the required batteries and charger, not just the bare tool.

Both saws get heavier with large-capacity batteries. That is helpful for runtime but tiring when holding the saw at shoulder height or making cuts from a ladder. For repeated ground-level cuts, the weight is less of a problem than keeping the workpiece supported and the saw’s base plate flat. Poor support can let the offcut sag and pinch the blade, producing a sudden stop or kickback.

Neither model’s bare-tool runtime tells the whole story. A series of shallow cuts in dry softwood uses much less battery than a few full-depth cuts in dense material. For long shifts, a spare compatible FlexVolt battery or spare Makita 18V LXT batteries may be a better purchase than expecting one pack to carry every cut.

Blade choice and common failure modes

For fast rough framing, a carbide framing blade is a sensible choice. For cleaner cuts in hardwood or visible work, use a sharper, higher-tooth-count blade rated for the saw’s speed. More teeth can improve the finish, but they also create more resistance in thick stock. If the saw bogs down, first check for a dull blade, pitch buildup, or an overly aggressive feed rate before blaming the tool.

Set the blade depth so the teeth extend only modestly below the workpiece—about 1/4 inch is a useful target for a square cut. Clamp or support the timber so the kerf cannot close on the blade, keep both hands on the saw, and wait for the blade to stop before setting the tool down. A fast brake helps after the trigger is released, but it does not prevent kickback caused by a binding cut.

A sharp 7-1/4-inch carbide blade is a worthwhile upgrade if the supplied blade is struggling or leaving a rough edge. Match the blade’s arbor and rating to the saw, and do not use a damaged blade to finish a difficult cut.

Which saw should you buy?

Choose the DeWalt DCS578 if you already use FlexVolt batteries, make frequent heavy cuts, or want a saw suited to sustained work in thick stock. Its power system is the stronger fit for demanding cutting, though it still needs a sharp blade and a steady feed. Check the exact cut-depth specification for your setup before buying if you regularly work close to the saw’s limit.

Choose the Makita XSH07 if you are invested in the LXT system and most of your work is ordinary framing, sheet goods, and occasional thick lumber. It is not a poor choice just because the DeWalt has an advantage under sustained load. For intermittent cuts in standard construction timber, the Makita’s performance is generally sufficient, and buying a second battery platform to gain a small practical advantage may not make sense.

If thick hardwood is the daily workload rather than an occasional challenge, compare both saws with a corded 7-1/4-inch model or a larger-capacity saw before deciding. For a mostly cordless framing setup, however, the practical answer is straightforward: buy into the battery platform you already own, then spend attention on blade quality, work support, and safe feed technique.