As part of our paid partnership with Home Depot, they sent along several Dewalt cordless power tools for review consideration – the new brushless random orbit sander, and a recent brushless braking grinder. Both are part of Dewalt’s growing 20V Max cordless power tool platform.
Ah, so you want to do some metal cutting or grinding? That’s where Dewalt’s braking grinder can come in.
The Dewalt 20V Max brushless braking grinder, DCG413B, was a quiet introduction that we first posted about in 2017.
- Brushless motor
- 4-1/2″ wheel size
- 9,000 RPM
- 2-state trigger
- Brake stops wheel in 2 seconds or less on average
- Kickback brake engages when a pinch, stall, or bind-up is sensed
- Ideal for metal cutting and grinding
- Ideal for cutting bricks/pavers, concrete
The grinder is available as a kit or as a bare tool. As a bare tool, it comes with the auxiliary handle and Type 27 guard. As with many if not most cordless grinders, Type 1 guards, for use with cut-off wheels, are available separately.
I for one prefer paddle switches, which cut power when hand pressure is removed from the trigger. You push a lock out of the way and then squeeze the trigger. Take your hand off the trigger, and the tool comes to a stop. And since this is a breaking grinder, it comes to a stop in about two seconds.
With a slide-switch grinder, you have to slide the switch to the off position (or remove the battery) to turn it off. Generally, paddle switch grinders are safer to use, although some heavier users prefer slide switches, which can be less fatiguing.
I’m not a very frequent grinder, and so the arbor nut stood out to me, more so than I can comment about its runtime or power (which so far was adequate and abundant, respectively).
I’m used to spanner wrenches which engage in two holes of an arbor nut. Dewalt’s 20V Max brushless grinder instead features an arbor nut that can be tightened by hand or a hex wrench. Frankly, it works really well, and is easier to use. Should you lose that hex wrench, you can source one elsewhere, although the included wrench is much longer than usual.
I really liked how easy and relatively quick it is to change discs and accessories. The spindle lock was easy to depress while during final tightening or initial loosening. The nut turned easily by hand, and tightening it with a hex wrench proved far easier than I thought it would.
You can tighten that by hand? Sorry, I’m a little behind the times here. The manual says:
While depressing the spindle lock button, tighten the locking flange by hand or using the wrench supplied.
So… yes, you can tighten it by hand. Loosening it might still require the hex wrench, though.
When the grinder first came in, I was hesitant. As mentioned, I don’t use grinders all that frequently, and while I knew I could put it through some testing, I wasn’t sure anything about it would standout. But, it surprised me.
(Dewalt’s FlexVolt grinder has a similar arbor and nut design, and also features a brake and kickback brake.)
It’s available as a bare tool, in a kit, and in a 2x 6.0Ah battery with bonus battery kit.
Overall, my initial hands-on impression is very positive. I love the arbor and nut design so far, and in use the grinder feels balances and well-controlled. The brake works, although it’s not as fast as the one on the FlexVolt grinder. Power doesn’t seem to be a concern at all, although I need more varied use before I can say for sure.
The only negative, at least to me, is the absence of a Type 1 guard, for use with straight cut-off wheels. But, if you mainly use grinding wheels and other accessories that require an open bottom, it’s a positive because it means you’re not paying for an accessory you might not need or even ever use.
Price: $169 for the bare tool
A disc is NOT included with the grinder.
Why buy this grinder compared to a brushed motor model? More power, longer runtime, no brushes to replace, modern ergonomics.
Why buy this grinder compared to the FlexVolt brushless model? Smaller size if you only want to use 4-1/2″ accessories, works with more affordable 20V Max batteries.
I will be holding onto this review sample for a while so that I can continue to test it. If you have any questions, please let me know and I’ll answer them as best as I can.