Forrest WWII angle question

[jussi]

I recently got a new WWII blade. It was from someone from another forum but was still new in package. I was comparing it with a WWII blade I got a year or so ago. It was used but assume it was just resharpened because it was still in wax wrapper. I noticed angle on the newer blade is much more aggressive. Pic on the left is the new blade. Anyone know why this is the case and when they started doing this? How does this affect the flatness of a dado or mortise cut.

[Knottscott]

Forrest has recently introduced a new 48T version of the WWII that has a 25° Hi-ATB grind, vs the more standard ATB grind of 15-20°. Not sure if that's the one you've got, but it's a possible explanation. I suspect the new 48T Hi-ATB WWII is Forrest's answer to the Infinity Super General and Freud P410 Fusion that both have a 30° Hi-ATB grind. Basically, if all other parameters are equal, the steeper the bevel angle, the less tearout the blade will have. The Super General and Fusion have repeatedly scored extremely well in ply, fine crosscuts, melamine, and other sheet goods. The downside is that the Hi-ATB grind isn't quite as efficient in thick ripping, and the tips will abrade slightly faster than a standard ATB grind.

[jussi]

You're right it is 25º . But the Forrest site still classifies it as an ATB and not a Hi-ATB. This is the model of the newer blade. ww10487125

http://www.forrestsawbladesonline.co...Cuts_Plus.html

[Knottscott]

You're right it is 25º . But the Forrest site still classifies it as an ATB and not a Hi-ATB. This is the model of the newer blade. ww10487125

http://www.forrestsawbladesonline.co...Cuts_Plus.html

Like alot things, blade classifications and definitions aren't standardized. Some would consider 25° as a Hi-ATB....I suppose it's safe to call it a "higher-ATB".