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

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Forum topic by Jason978 posted 446 days ago 635 views 0 times favorited 8 replies Add to Favorites Watch
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Jason978

10 posts in 462 days


446 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

View kdc68's profile

kdc68

1956 posts in 902 days


#1 posted 446 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

5416 posts in 2000 days


#2 posted 446 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....

View Jason978's profile

Jason978

10 posts in 462 days


#3 posted 446 days ago

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

View kdc68's profile

kdc68

1956 posts in 902 days


#4 posted 446 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

6923 posts in 1539 days


#5 posted 446 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 462 days


#6 posted 445 days ago

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

View kdc68's profile

kdc68

1956 posts in 902 days


#7 posted 445 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

View NiteWalker's profile

NiteWalker

2709 posts in 1202 days


#8 posted 445 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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