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Riving knife slack.

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Forum topic by Plain posted 07-18-2016 05:46 PM 298 views 0 times favorited 4 replies Add to Favorites Watch
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Plain

157 posts in 166 days


07-18-2016 05:46 PM

I had my G0715 for some time, which I must say is an excellent machine, I wish it was a bit more accurate though.
I noticed the riving knife flexed quite a bit without applying much efforts. I looked if I could stiffen it but it seemed to be done intentionally. The riving knife sits on a long arm attached to the arbor assembly and it is springy at the connecting point. Is it the same on other more expensive saws ?


4 replies so far

View GR8HUNTER's profile

GR8HUNTER

1153 posts in 180 days


#1 posted 07-18-2016 06:46 PM

A riving knife rides within the kerf…....... pivoting on the saw’s arbor in relation to blade height….....to maintain an even gap between the two cut sides of the board….........preventing jamming which could cause the stock to be forcefully ejected rearward toward the saw’s operator…... so I think it is fine

-- Tony Reinholds,Pa. REMEMBER TO ALWAYS HAVE FUN

View Plain's profile

Plain

157 posts in 166 days


#2 posted 07-18-2016 07:34 PM

Does it mean that those small Micro Jig splitters could jam the stock?

View Kazooman's profile

Kazooman

628 posts in 1420 days


#3 posted 07-18-2016 11:53 PM

No, there is not any additional problem with jamming the stock. The small micro jig splitters are embedded in the insert that surrounds the blade. They are sized to keep the kerf open as the workpiece passes the blade. Note that a splitter that is in the saw’s opening insert will not tilt with the blade. A riving knife attached to the arbor will keep its relationship to the blade as the blade is raised or tilted. A much better situation.

You have the ideal situation to see how a “more expensive saw” handles the riving knife. Just examine the Sawstop you are currently assembling. The riving knife and the blade guard share a common connection point. It is the lever operated clamp just to the rear of the blade as you face the saw.

View BorkBob's profile

BorkBob

124 posts in 2160 days


#4 posted 07-19-2016 09:46 PM

IMO, the riving knife (or splitter) is there to keep the work from contacting the back of the saw blade in a manner that would allow it to be “kicked back”.

For a riving knife to prevent the work from closing on the saw blade, it would have to be as thick or thicker than the saw blade kerf. This would result in the knife being too thick to allow the saw kerf to pass its leading edge. It follows that any cut that closes on the riving knife will also close on the saw blade.

The standard that I apply is making the thickness of the riving knife thinner than the saw blade kerf and thicker than the body of the saw blade.

I do not believe the riving knife is there to keep the saw blade kerf open. I also do not believe the riving knife is there to hold the stock against the fence. That’s what we are there for.

-- Please Pray for Our Troops / Semper Fi / Bob Ross / www.theborkstore.com

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