Irwin Marples 10-Inch 80-Tooth Hi-ATB Saw Blade | Canadian Woodworking

An economically priced blade that delivers clean, chip-free crosscuts in solid wood and sheet goods.

Irwin Marples 10-Inch 80-Tooth Hi-ATB Saw Blade

Irwin Marples 10-Inch 80-Tooth Hi-ATB Saw Blade



Combination blades are among the most popular saw blades because they do a reasonably good job at both ripping and cross cutting. And, it's nice not having to constantly switch between two different types of blades. On most combo blades the teeth are ground with four Alternate Top Bevel (ATB) teeth and a trailing Flat Top (FT) tooth. The ATB teeth have a top bevel angle of about 10-degrees. This is a compromise tooth angle that enables the blade to slice fires fairly well when cutting across or with the grain, while the FT tooth rakes material out of the kerf. 

However, if you're looking to get the smoothest, chip-free crosscuts, you need to use a blade specifically designed for fine crosscutting. These Hi-ATB blades have higher top bevel angles that increase the knife-like action of the teeth.

Irwin makes a variety of saw blades under the 'Marples' name, and I recently tried their 80-Tooth Hi-ATB Saw Blade.

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Steep tooth angles make for crisp cuts

Similar to most Hi-ATB blades, the Irwin blade features a 30-degree top bevel, along wit a 10-degree rake and a 15-degree top clearance angle. This tooth configuration is designed to produce a smooth finish when crosscutting solid woods and sheet goods because of the knife-like edges on the beveled teeth. Because the blade doesn't have a FT tooth it produces a V-groove on the base of the grooves or tenons.

The plate is 5/64" thick, and the teeth produce a 3/32" kerf, which makes this a thin-kerf blade. A thinner blade requires less cutting power, so it's better suited for table saws with motors under 3 HP. It also produces about 25-percent less waste than a 1/8" blade, an important consideration if you use a lot of exotic woods.

The plate is laser cut (rather than hydraulically stamped or die cut), and precision tensioned and straightened. I checked the runout and found it to be less than 0.004". 

There are twelve anti-vibration slots cut into the outside edge of the blade and 4 noise reduction/expansion regulating slots cut around the center. The 5/8" bore hole is precisely drilled as it fits very snugly on the arbor, without any slop whatsoever. The anti-vibration slots are important, because any vibration in the blade will affect the smoothness of the cut. I'm less concerned about how quiet a blade is, as I always wear hearing protection in the shop.

The blade sports a friction-reducing coating that ostensibly reduces both heat-build-up and the accumulation of resin on the blade. My experience is that the coating does reduce resin build-up, and I find coated blades easier to clean.
 
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Large teeth mean a longer service life

Virtually all saw blades now use C4 carbide for the teeth, as it stays sharper longer. However, not all C4 carbide is the same, and the higher the quality of the carbide, the more run time you'll have before needing to resharpen. Irwin uses only top quality micrograin carbide in it's teeth.

The 80 teeth on this Irwin blade are about 5/16" long, and they're very cleanly brazed onto the plate with no visible gaps or porosity. The face of the teeth are polished to a mirror finish - you can almost see your own reflection. Because of the size of the teeth I would expect to be able to resharpen the blade 8 to 10 times.

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Crosscut in maple

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Crosscut in sapele

Overall I was impressed with the quality of crosscuts made by the Irwin blade. Most important to me was how it performed with solid wood, and here I wasn't disappointed. With the blade raised about 1/4" above the stock, and using a zero clearance insert on the saw, the cuts were consistently clean and chip free on both sides. There were barely discernable teeth marks across the end grain – when the cut ends won't show, it's a go, otherwise I would clean them up with a shooting plane.

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Crosscut of engineered flooring

Cuts in MDF, plywood, and engineered plywood were also consistently very good. I did notice some chip-out on imported plywood – virtually none on cabinet grade domestic ply. I attribute this to the inferior quality of imported sheet goods.

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An economical choice for professional and hobbyist woodworkers

For just under $80 the Irwin Marples 80-Tooth Hi-ATB Saw Blade offers very good value in a fine crosscut blade for both professional and hobbyist woodworkers. And, those large C4 carbide teeth mean that you'll get a lot of use out of the blade.

KEY FEATURES:

  • 10" 80-tooth
  • HI-ATB (High Angle Alternate Top Bevel)
  • 5/64" plate
  • 3/32" thick teeth
  • 5/16" teeth length
  • 3/32" kerf
  • 10° hook
  • 30° ATB angle
  • Laser-cut plate
  • Heat-resistant non-stick coating
  • Precision tensioned
  • 12 noise reduction/expansion regulating slots
  • 4 anti-vibration slots
 
COMPANY:Irwin Tools
MODEL:807370
PRICE:$78.00
MADE IN:Italy
SOURCE:Dealer Locator

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Author: 
Carl Duguay
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