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Combination (50T) vs General Purpose Table Saw Blades

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Forum topic by yuri posted 12-11-2012 09:20 PM 3319 views 0 times favorited 10 replies Add to Favorites Watch
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yuri

136 posts in 3069 days


12-11-2012 09:20 PM

Let talk about the difference, what makes one shine over other and what situation.


10 replies so far

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Surfside

3389 posts in 1639 days


#1 posted 12-11-2012 09:27 PM

Yuri, what do you think?
Personally, I don’t know which of the two is better.

-- "someone has to be wounded for others to be saved, someone has to sacrifice for others to feel happiness, someone has to die so others could live"

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Clint Searl

1533 posts in 1827 days


#2 posted 12-11-2012 09:42 PM

Why the question?

-- Clint Searl....Ya can no more do what ya don't know how than ya can git back from where ya ain't been

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knotscott

7216 posts in 2841 days


#3 posted 12-11-2012 09:43 PM

This is a tough comparison for a couple of reasons….

1) There are pros and cons with each type….no single blade type is best in all areas of evaluating a cut. The characteristics that we like in a blade will dictate which ones we like best. It’s subjective.

2) Most blades are unique within a classification “type”, which makes it tough to draw definitive conclusions across the board between blade types. All blades within a class don’t perform the saw way.

Both types are capable of a glue ready edge right off the saw, can rip fairly efficiently, crosscut pretty well, and can be pretty good in ply, but it depends on the individual blade and how well the design is executed, whether it’s sharp, clean, the saw, the material, the technique used, etc. Both types are also a compromise from comparable quality task specific blades when it comes to performing the intended task. My general observations have been that 40T blades such as the WWII, Ridge Carbide TS2000, Infinity Super General, Freud Fusion, Delta/DW7657, CMT 213.040.10, Tenryu Gold Medal tend to leave a smoother edge with fewer blade marks, while the 50T ATB/R combo blades tend to burn less and be easier to get good results with….they seem less fussy about the saw setup as some of the 40T.

-- Happiness is like wetting your pants...everyone can see it, but only you can feel the warmth....

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yuri

136 posts in 3069 days


#4 posted 12-11-2012 09:45 PM

Surfside, I do not have experience with them. From the name they seems to serve the same purpose but what is difference, I do not know, that is I want this discussion :-)

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yuri

136 posts in 3069 days


#5 posted 12-11-2012 09:52 PM

knotscott, I knew that you will chime with good explanation! I was not wrong :-)
I use 40T and do not have issues with them and no burning. The thing I would like to improve a little bit in cross cuts of soft wood and plywood (across face veneer). There are some splinters. I read your review of Irwin Marples 50T blade, so got curious. Is it better in cross cuts than 40T ones in your experience?

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yuri

136 posts in 3069 days


#6 posted 12-11-2012 09:53 PM

Clint, your are right about question, do not know why, so corrected it ;-)

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knotscott

7216 posts in 2841 days


#7 posted 12-11-2012 10:19 PM

Less tearout will largely be a product of the type of grind on the top of the tooth, number of teeth, and the hook angle, assuming all other quality parameters are equal. A Hi-ATB grind tends to have the least amount of tearout of any grind….the top bevel of a Hi-ATB grind tends to range from 25° to 40°…the higher the top bevel, the lower the tearout… the higher the number of teeth, the lower the tearout….the lower the hook angle, the lower the tearout.
Ie: One of the 40T blades with a 30° top bevel (Super General and Fusion) will have less tearout than a 40T blade with a standard top bevel of 15°-20° (WWII, 7657, Gold Medal, etc.).

With that said, for the ultimate in crosscut and ply performance, grab an 80T Hi-ATB blade like the Infinity 010-080 Ultrasmooth, Forrest Duraline, Freud LU80, CMT 210.080.10, etc. A Hi-ATB 60T blade like the WWI or Infinity 010-060 will also eclipse the crosscut performance of a 40T or 50T blade, and will have a bit more versatility than the 80T.

More reading for those interested

p.s.: did I review an Irwin Marples 50T?

-- Happiness is like wetting your pants...everyone can see it, but only you can feel the warmth....

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yuri

136 posts in 3069 days


#8 posted 12-11-2012 11:53 PM

Oops, I referred wrong. I confused you with another blade enthusiast lumberjoe . He wrote there
Knotscott, my apology. But anyway, I always read your comments on saw blades with interest.
As for cross cut blades. Yes I know, that for best splinter free results dedicated blades a best. But I do not like to interrupt my work and switch blades. And I am pretty happy with good general purpose 40T blade, but if it could be improved without loss of convenience of universal blade I’d switch to combination 50T blade.

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knotscott

7216 posts in 2841 days


#9 posted 12-12-2012 12:07 AM

Because it’ll rip fairly efficiently in up to ~ 5/4” material, that Infinity 010-060 is a pretty slick blade even for many general purpose tasks. It’s terrific in ply and fine crosscuts, and will give clean rips up to ~ 5/4”. That, or something like the Freud LU88 and likely the Irwin Marples 60T would also be nice candidates to use as a “hybrid general purpose/crosscut blade”. They could all be left in the saw for just about everything but really thick rips, which are best left to a 24T FTG bulk ripper anyway. You should also find that the Super General thin kerf or the Fusion thin kerf would improve your crosscut/ply performance over a standard 40T or 50T blade, just not quite to the same degree.

I’m relieved that the Marples review wasn’t mine! Not that I don’t want to try one, but I was concerned that I had no recollection of the event! I’m hearing lots of good things about those blades.

-- Happiness is like wetting your pants...everyone can see it, but only you can feel the warmth....

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MonteCristo

2098 posts in 1654 days


#10 posted 12-12-2012 05:43 AM

One size never fits all, but if it’s really sharp, it will come closer.

-- Dwight - "Free legal advice available - contact Dewey, Cheetam & Howe""

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