Up To The Task
Jul 31, 2006 (Updated Aug 2, 2006)
Review by woody2
Rated a Very Helpful Review
Pros:Operates safely on a variety of saw types. Crosscuts very cleanly in wood and sheetgoods.
Cons:Poor versatility for ripping operations.
The Bottom Line: A high quality blade recommended specifically for crosscutting woods or cutting sheet materials. Well suited for use in a TS, CMS, SCMS, or RAS.
I know, I know...another saw blade review....but what can I say? Opportunity keeps knocking and I keep answering. In this case a $70 blade found it's way to my door for closer to the $30. The DeWalt DW7647 is an 80 tooth 10" fine crosscut blade from their top end Series 60 "Woodworking" line. It features 80 alternating top bevel C4 carbide teeth set at a negative 3 degree hook angle, which is a configuration that lends itself to very clean, highly polished crosscuts. The body uses a highly tensioned laser cut steel alloy with laser cut expansion slots for low vibration. The teeth are thick and should withstand several sharpenings. It definitely gives the impression of a well made blade.
Recommend this product?
The DW7647 is intended as a dedicated fine crosscut blade with little versatility in the way of rip cuts due to the combination of high tooth count and negative hook. Ripping with the 7647 would likely lead to a very slow feedrate in wood and excessive burning of the stock. Better to stick to it's intended usage of crosscutting. It does however lend itself nicely for use in a compound miter saw, sliding compound miter saw, or a radial arm saw in addition to table saw use. Blades with a steep positive hook angle like those found on rip blades and general purpose blades tend to grab the wood and cause a self feeding action which can spell problems on the CMS, SCMS, and RAS.
Made in Great Britain, DeWalt's upper end Series 60 and Series 40 DeWalt blades share many of the same styles and tooth geometries, and both lines are aimed at the more precision minded highend niche of the woodworking market as opposed to their contractor series found in many homecenters. One of the biggest differences between the two series is that the Series 60 features the hardest grade of carbide available for saw blades - C4, versus the very respectable C3 carbide on the Series 40. Because of it's hardness C4 can be sharpened to a higher degree and will tend to resist dulling better, but C3 is actually a bit more shock resistant and is less likely to chip from impact on a hard surface. Another difference is that the Series 60 blades are only available in a full 1/8" kerf, whereas many of the Series 40 blades are available in both full kerf and 3/32" thin kerf...an excellent choice for smaller saws. For example, the DW3218 is the Series 40 equivalent of the DW7647, and the DW3218TK is the thin kerf version.
This is at least the fourth Series 40 or Series 60 DeWalt blade that I've tried. Like the others before it, I like the DW7647 quite a bit. It does an excellent job of it's intended purpose, leaving a polished edge with very little tearout or scoring while crosscutting 6/4" hard maple, 4/4" oak, 5/4" red elm, and 3/4" cherry. It's not intended as a specialty plywood or melamine blade, but it will cut nearly splinter free in sheet materials like these as well as hard and soft woods. I was pleasantly surprised that the blade didn't bog my saw down too badly...at least in crosscuts and sheet goods. Blades with high tooth counts tend to have slower feedrates, as do blades with negative hook angles. The combination of those two factors and the fact that it has a full kerf had me concerned that it might struggle in the thick oak, but to my surprise it performed admirably even when crosscutting the thicker maple. Although I didn't attempt ripping hard or soft wood with the DW7647, I'm confident it wouldn't impress in that regard. In spite of the limited cutting range of the 7647, it does offer alot of flexibility with the types of saws it's compatible with, and does an excellent job crosscutting as intended.
In comparison to the 80 tooth Freud F810/LU80R010 Hi-ATB plywood specialty blade that I reviewed a while back, the DW7647 is very good but does not have the tooth geometry to leave the ultra clean cuts in plywoods and veneers. However the ATB grind of it's teeth should stay sharp longer that the Hi-ATB tips of the LU80. Compared to my 60T Freud LU88R010, the DW7647 easily crosscuts as cleanly, leaving a slightly more polished edge. The 7647 is no where near as versatile in it's cutting versatility as the LU88, but it's definitely usable in more types of saws than the LU88 which is really better suited for table saw use due to it's steeper hook angle. If you need a high quality fine crosscut blade for use in a variety of saw types at a reasonable price, this one is definitely recommended. I think it'll find a home in my compound miter saw.
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