More Experiments with Chipbreakers




This week I’ve been surfacing plenty of wooden by hand, from
pedestrian sugar pine to funky metals which have wood-like
properties (e.g. purpleheart). And all of the whereas I’ve been
testing, testing, testing issues with my chipbreakers and the
slicing angle of the iron of my handplane.

Huh? You would possibly say. Sure, there could be a relationship.

So I’ve been up at Lie-Nielsen Toolworks in
Warren, Maine, this week to show courses, shoot a video and
reveal on the firm’s open home. Throughout the evenings,
I’ve been debating plenty of theories about wooden failure with
Deneb Puchalski and Thomas Lie-Nielsen. Listed here are some
highlights.

1. Why does setting the chipbreaker loopy shut scale back
tear-out? Deneb of Lie-Nielsen has a superb concept. He thinks
carefully set breaker “fools” the wooden into pondering that
it’s being planed by a high-angle airplane. So a 45° airplane with a
25° breaker out of the blue acts like a 70° airplane. This is sensible.

2. Do you want a decent mouth with a close-set breaker?

three. Do you want a high-angle airplane with a close-set chipbreaker?

four. What impact does honing the breaker have? And what angle
must you use?

So over the last week, right here’s what I did. I labored with two
smoothing planes. One with a 45° frog. One with a 55° frog. I
honed the innovative the identical and tapped the chipbreaker as
shut as I dared to the sting. I additionally did some work with a
bevel-up jack airplane honed at 50° so it had an efficient slicing
angle of 62°. All of the planes had mouth apertures of 1/16”,
which is fairly large open.

On the smoothing planes I honed a 50° angle on the
chipbreakers. So if Deneb’s concept was right, I truly had
three completely different planes. One was slicing at 62°. One was at 95°.
The third was at 105°.

Then Deneb, Dave Jeske of Blue Spruce Toolworks
and I put the planes to make use of on quite a lot of woods. We tried
reverse-grain cherry. It was no problem for any of the
planes. Then curly fowl’s-eye maple, planed in opposition to the grain.
Once more, no drawback. Historical fossilized purpleheart. Nope. No
distinction. Then a board that we have been advised was unplanable: huge
furry, roey mahogany.

Once more, all of the planes dealt with the wooden with no actual issues.

Lastly, I pulled a chunk of wooden out of the trash. It was
cherry with a decent swirled knot in it. There was a crapload of
grain reversal across the knot. A number of quartersawn grain
rippling throughout the face.

In different phrases, it was match to be burned.

After dressing the wooden with a toothing airplane we put the 62°
airplane to it. It cleaned up all the board besides a slim
band of tearing alongside one of many quartersawn ripples. Then we
took the 95° airplane to it. No pleasure. However the 105° airplane cleaned it
up properly. And it left a typical planed floor – it didn’t
appear like it had been scraped.

So maybe Deneb has one thing. Or my 105° airplane is haunted by
a small dwarf or troll.

— Christopher Schwarz

Learn extra on my chipbreaker experiments
here
.


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