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Is this Frued blade kerf too small for my riving knife?

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Forum topic by Jason978 posted 417 days ago 610 views 0 times favorited 8 replies Add to Favorites Watch
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Jason978

10 posts in 433 days


417 days ago

hi,

I have the porter cable table saw, the big one.

the riving knife is .09” thick. The blade I bought (frued 50T industrial) has a .091” kerf. Is this too close to the riving knife size to be safe?

thanks,


8 replies so far

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kdc68

1938 posts in 872 days


#1 posted 417 days ago

To give you a perspective…a piece of ordinary copy paper is .004. IMO it is too close. I would try a blade that is .098….which is still considered thin kerf..

-- Measure "at least" twice and cut once

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knotscott

5365 posts in 1971 days


#2 posted 417 days ago

It is close, but there’s going to be some run-out from the saw’s arbor and from the blade itself that should give you some more clearance. Also, the front of the riving knife should be tapered a bit which should help it enter the kerf opening. If everything is aligned really well, it could be ok. You can always give it a try and see how it goes, but be ready to shut it down if things bind.

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

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Jason978

10 posts in 433 days


#3 posted 417 days ago

if the total runout from the blade /arbor is .002, does that mean that the actual kerf is .091 +.002?

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kdc68

1938 posts in 872 days


#4 posted 417 days ago

I will assume yes…
The more clearance with that .090 knife and .091 blade that you can get… the better
I suppose, with calipers, you could measure the kerf of a partially cut board.

-- Measure "at least" twice and cut once

View HorizontalMike's profile

HorizontalMike

6914 posts in 1510 days


#5 posted 417 days ago

My riving knife is 0.098in and it calls for a blade kerf of 0.102—0.126in. That is a minimum difference of 0.004in to 0.128in difference. In other words, if the riving knife is too close to the size of the blade kerf then you could get some serious (read dangerous) pinching behind the cut. It all depends on the wood and its characteristics (reaction wood, too moist, etc.).

-- HorizontalMike -- "Woodpeckers understand..."

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Jason978

10 posts in 433 days


#6 posted 416 days ago

i think ill try a new blade, better safe than sorry.

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kdc68

1938 posts in 872 days


#7 posted 416 days ago

i think ill try a new blade, better safe than sorry
v
v
A blade that is good bang for the buck are the Diablo’s…If you have a Home Depot near you…..They are .098 in kerf…
My riving knife is .090 and I use the Diablo’s with no issues

-- Measure "at least" twice and cut once

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NiteWalker

2699 posts in 1173 days


#8 posted 416 days ago

Properly aligned, you should be ok.
Before I got my saw with a riving knife I used a shopmade splitter that was the exact size of the kerf. No issues.

-- He who dies with the most tools... dies with the emptiest wallet.

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