Without heading back to your table saw or miter saw, you can pull out a portable circular saw to make straight and rip cuts through your boards. They’re not just designed to cut through woods, both soft and hard, but with the right blade, you can cut through materials such as plastic, ceramic tiles, and even masonry. Essentially, a circular saw is a handheld tool for slicing any sort of material on the spot.
Today, we’re taking a look at two of DEWALT’s circular saws the DWE575SB and the DCS391B. DEWALT is one of the most popular power tools manufacturers on the planet, and there’s little doubt that both of these tools can perform admirably at the job site. However, there are some rather significant differences between the two models that need to be addressed, especially regarding portability and cutting depth. Without further ado, let’s jump right into our comparison.
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Corded-Electric vs Cordless
The DWE575SB is a corded-electric circular saw. This means that you will be tied down by power cords, and the only way to extend your range of movement is with the help of a high-quality extension cord. However, corded-electric tools are generally more powerful than their cordless counterparts, and they won’t die down on you in the middle of slicing a board unless there’s a blackout.
The DCS391B is a cordless tool that runs off of 20V rechargeable Li-Ion batteries. Since there aren’t any cords to play around with, you can virtually go to anywhere in the world and begin sawing away at boards and masonry. This kit doesn’t include a battery and charger so be sure to invest in more than one battery to vastly reduce downtime.
Conclusion: The obvious benefit of having a cordless tool is that you can take it with you to wherever you’re going. Your work time is limited to how many batteries you have and how fully charged they are. Corded-electric models generally don’t have any downtime, provided that you’re near an outlet or have access to a reliable extension cord. There’s really no objective way to determine which is better so we’ll leave that up to you.
Blade Size and Cutting Depth
Corded-electric circular saws generally have larger blades than cordless models. This tool comes with a 7-1/4-inch carbide tipped blade. This is an average-sized blade so you shouldn’t expect super-deep cutting depths. The blade can reach 2-9/16 inches deep when at 90° and 2 inches when beveled 45°.
This cordless model comes with a 6-1/2-inch carbide tipped blade which is above the industry average of 4-1/2 inches for cordless models. While at 90°, it can cut boards as thick as 2-1/4 inches in a single pass, and when beveled to 45°, it can reach up to 1-5/8 inches.
Conclusion: Obviously, we want a circular saw with a large enough blade and deep enough cutting capacity to handle every single job we have. Realistically speaking, a circular saw won’t be able to cut every board, but they can be handy for making shallow cuts, with and against the grain of the board. Larger blades are preferable since they can reach greater depths, making the DWE575SB with its 7-1/4-inch blade the better option.
Motor Power and Speed
This tool comes with a 15.0-amp motor. This helps the saw reach speeds of up to 5,100 RPM. For a circular saw with this large a blade, we were quite amazed that it could surpass the 4,000-RPM mark, but then again this is DEWALT we’re talking about.
The DCS391B draws power from a 20V 1.5-amp Li-Ion battery. When fully charged, you can expect the blade to reach speeds of up to 5,150 RPM. Looking at the battery alone, it’s not a surprise that this tool can reach more than 5,000 RPM. For cutting wood, masonry, and tiles, this tool with its amazing power and speed will do the trick.
Conclusion: Looking at these tools’ respective motor power and speeds, we can conclude that the DWE575SB is the more efficient tool. First of all, a larger blade is supposed to spin at a lower RPM than smaller ones, and even though it’s true in this case, the difference in speed is minuscule. You’ll get more speed for power with the DWE575SB than you would with the cordless DCS391B.
This tool comes with a forward-facing dust blower. Basically, while you’re sawing away wood or ceramic tiles, the blower will gently send a continuous gust to get rid of all chips and dust. This gives you a perfect view of what you’re doing. It’s a super-handy feature to have, and it’s not found in very many circular saw models.
This tool doesn’t come with a dust blower. When working on wood or tiles, the resulting debris may clog the space on either side of the blade, increasing the risk of creating burn marks on your precious materials. You can manually blow away the dust with your breath, but since you’ll most likely be wearing a dust mask or respirator, this will be impossible.
Conclusion: A dust blower is extremely helpful in eliminating dust and chips produced from a circular saw. It can clear the path in which the blade is traveling and give you a clear view of what you’re doing. It’s unfortunate that the DCS391B doesn’t come with an integrated dust blower, but then again you have to remember that it would greatly reduce battery power.
DEWALT DWE575SB vs DCS391B: Verdict
It can be quite confusing when comparing corded-electric and cordless models with each other since there are significant differences in working time, downtime, power, and speed. Cordless models are generally supposed to be weaker than corded-electric tools, but when comparing the DWE575SB and DCS391B head-to-head, we don’t see very many large differences in performance. For this reason, we feel that the DCS391B would be one of the best options if you’re going to purchase a cordless circular saw. However, there are several advantages that the DWE575SB has over the DCS391B, such as a handy dust blower and greater cutting depths.
- Powerful 15-amp motor delivers 5,300-RPM for greater speed and faster cuts
- 7-1/4-in carbide-tipped blade included. Spindle lock for easy blade changes.
- 51 degree bevel capacity for a wide variety of cuts. Arbor size: 5/8 inches, cord length: 6 feet
- Magnesium components create a lightweight saw (10.6 pounds) that is well balanced and jobsite tough
- Powerful 15.0 AMP motor delivers 5,800 RPM for proven performance and jobsite durability
- Two built in L.E.D lights illuminate the line of cut for increased accuracy
- Imported from: China
- POWER TOOLS
- Commercial Brand: DEWALT