Was watching a prerecorded episode of Woodsmith tonight.
The man was cutting deep 3/4" wide dados using a sled and the rip fence
at the same time (the blade was 6" from the fence), in 3 passes.
Is kickback not a problem here because the height of the blade is less
than the height of the wood, or is this a safety issue?
No, snug really has nothing to do with it, although snug is always a
What makes kickback a virtual impossibility in the case is that there is
no lose piece on the rip-fence side of the blade. Also, as another
pointed out, there is no chance of binding on the forward side of the
I was pointing out, in reference to using a sled, that since there is a
fence on the sled to keep the "cut-off" side from backing away from the
blade, there is no chance of it twisting between the blade and rip-fence
which is a main cause of kickback.
In the case of cutting a dado on a table saw without a sled, it would be
perfectly safe to do so with a miter gauge (with or without an extended
miter fence). Again, there will be no cutoff piece to bind between the
blase and rip-fence.
"Playing is not something I do at night, it's my function in life"
Be careful with the suggestion that this is safe. Every thing has to be
done correctly to prevent kick back.
If you pull the sled and work back through the blade and you let the
work move at all a kick back is going to happen unless you continue to
hold the work piece firmly in place.
Kick back does not require a loose piece between the blade and fence, it
merely requires for the blade to catch the wood and throw it back.
Two schools of thought here. One is that if you aren't cutting through
the wood, you won't get kickback because the wood won't close in
behind the blade. Which is true.
But you still have a possible source of kickback, which is that if
your work somehow gets hung up against the fence, it can twist againt
the blade and you can still get kickback. Not as likely, but still can
happen. I wouldn't do the sled + fence move because there are other
ways to get the job done.
If anyone else has seen the episode, maybe we can offer opinions on the
strategy used of making a mortise by cutting a dado into the edge of
each of two pieces of wood and then glueing these edges together. Maybe
one can argue that the glue is stronger than the wood, but my intuition
tells me that one is inviting the glue joint to fail.
Not arguing, but also not sure how that relates to the question asked.
If I understand Bill correctly, the technique he described entails
cutting 2 dados and then 'butt joining' the pieces together to form a
That does indeed seem to introduce an extra point of failure.
The problem is that Bill is ambiguous in his _terminology_ when asking
the question, therefore no answer will be correct until that is determined.
When gluing wood you are basically dealing with faces, edges and end
grain ... the correct answer would depend entirely upon which he was
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