You can adjust the frog on some hand planes to make
the mouth smaller when you are making fine strokes. My
question: why does it make a difference whether the mouth
of a hand plane is larger or smaller? Does it make the
cut any smoother?
It can help reduce tearout in some cases, but it's not strictly
necessary and it needs to be pretty small to be effective at this. See
this article by Chris Schwarz.
It makes a difference, the why is a bit complicated.
Yes, a "tighter" mouth "can" produce finer shavings and a smoother
If you have the time take a look at
Jeff's Planing Notes will tell you more than youy want to know about
the mechanics of the cutting action of a wood plane - it's a lot more
complicated than most of us realize (or want to know).
You can also read
which is really about edge angles but can help one understand waht's
going on when the plane blade shears (or breaks) wood.
The idea is that it a smaller throat should reduce chatter (and tear-out?) when
going over knots and inter-locked grain.
In my experience holding the plane at an angle to the cut you're making and
setting to an even finer cut is a lot more effective at stopping chatter than
the most finely tuned throat. Maybe my technique is to blame...
firstname dot lastname at gmail fullstop com
Yes. When working against the grain the tendency is for the edge to get
under the fibres. The backface lifts the fibres so they are rived instead of
being cleanly cut. The riving (splitting) and eventual breaking causes the
A very closely set mouth acts so that its front lip presses down on the
fibres, preventing them from being raised and allows the edge to reach the
fibres and cut them.
Jeff Gorman, West Yorkshire, UK
email : Username is amgron
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