|Review by knotscott||posted 06-13-2009 04:41 PM||8051 views||4 times favorited||5 comments|
This DW7670 is DeWalt’s 8” stacked dado blade set. It features (2) 24 tooth outside cutters, (4) 4 tooth 1/8” chippers, (1) 4T 1/16” chipper, (1) 4T 3/32” chipper, (12) steel shims, and a handy carrying case. The DW7670 expands to a maximum cutting width of 29/32”, and has a nearly infinite number of possible smaller widths by using the various shim and chipper sizes. All the teeth are C-4 micrograin carbide, and the bore diameter will fit 5/8” arbors. The width of each blade and each shim is clearly marked for easy identification.
The DW7670 was the third of my 5 stacked dado sets. It replaced a very good Freud SD208, which replaced a lesser quality steel Vermont American stacked dado, and has since been succeeded by a $300 US made Systimatic 42T/6T Superfine set, and finally an outstanding $200 Infinity Dadonator 24T/6T set.
The first thing that caught my attention when I opened the DW7670 is the carrying case. The entire design of the DW7670 is different than my SD208. In addition to having twice the number of teeth, there’s also no anti-kickback fingers on the DeWalt like there are on the Freud, which is a nice safety feature that may be a consideration for some. The design of the DW7670 is more similar to the top notch Forrest Dado King. The number of teeth on the 7670 are comparable to Freud’s SD508 which is also a more expensive blade set. The chippers on the Forrest and the DeWalt sets are tapered toward the outside of the blades, whereas Freud’s chippers are closer to the same width across the length of the blade to accommodate the anti-kickback fingers. Because the chippers are tapered, the mass is lighter at the outside of the 7670 than the Freud, making it easier to spin. In addition to less slowdown during heavy cuts, the 7670 made exceptionally clean cuts in a variety of materials. My SD208 was a very good performer and I don’t want to take anything away from it or it’s value…the bottoms of cuts were geometrically flat and edges were reasonably clean, but the DW7670 simply leaves a cleaner cut. The SD208 left minor “striping” on the bottom of dado cuts that the 7670 does not leave. Edges are also moderately cleaner with the DW. The shim stock also seems better made than those with my Freud set. The shims on my SD208 were prone to becoming disfigured near the bore and folding over rendering them useless. The addition of the sixth chipper (3/32”) is also very convenient and lends itself nicely to real world plywood widths. Many sets only offer 5 chippers in two widths.
My only real complaint with the 7670 dado set is the country of origin, and is not performance related. My other Series 40 and Series 60 DeWalt blades are made in Great Britain. The DW7670 is made in China, which was a disappointing surprise to me personally but may not be an issue for others. The 7670 can often be found on sale in the $90 range. That being said, it does offer the design features and performance of the more expensive American or Italian made dado sets. I was initially quite impressed with this set. After switching to two higher-end sets some from Systimatic and Infinity, I’m even more impressed with the performance to price ratio of the DeWalt. I can’t say that it’s comparable to the Infinity Dadonator, which is the best I’ve used to date, but it’s not that far behind and is considerably less expensive. Note that this set is also available as the Delta 35-7670, and the DeWalt H7200…all the same set AFAIK.
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