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David Charlesworth curved iron technique

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David Charlesworth curved iron technique

#1

David Charlesworth curved iron technique

Dan S in NC

>I've recently been trying to produce a cambered edge on the blade for my LN 4� (York pitch) a la the David C video from LN. He recommends a 23� grind with 35� and 38� for the primary and secondary microbevels, respectively. He also stresses that one *mustn�t* exceed these angles.

Making the assumption that David is using a standard pitch frog, I therefore would need to reduce these angles to match the York pitch frog so as not to exceed the effective cutting angle that he recommends we *mustn't* exceed. So, I did just that.

My early attempts are leaving a rather non-smooth surface on some Douglas fir*. These are my very first forays into cambered iron territory, mind you, so more practice and fiddling are definitely in order. Even so, I'd like to know others' experience in developing the cambered iron technique in their own hands, both from developing good honing skill, setting up the plane, and putting plane to wood.

*Select grade; I'm in love with the color, grain and fabulous ray flecks. Incidentally, I've been able to get a glass-smooth surface with a straight edged iron, but the ridges are difficult to get rid of.

Re: David Charlesworth curved iron technique

#2

Re:

glh

>I've gotten good results by using his method of chambering the cutting edge, but I use my standard angle (25 degrees primary and 5 degrees secondary).

Re: David Charlesworth curved iron technique

#3

Re: David Charlesworth curved iron technique

Matt Dworman

>You do not need to change your angle to "compensate" for the york pitch. Remember that the grind and hone angles are on the bevel which is on the bottom of the blade - you are not changing your cutting angle at all. Stay with his reccomended angles and you will have good results

Re: David Charlesworth curved iron technique

#4

Re: David Charlesworth curved iron technique

Dean in Burlington

>Hi. I think you have this backwords. When using a standard pitch frog they say you can't have your primary bevel higher than like 40 degrees or the plane won't cut anymore. But with the york pitch you can now sharpen your blades to 45 degrees which is what I did for my latest project using the york pitch to smooth Jatoba which dulls the blades quickly. But with the 45 degree secondary bevel now the blades last longer.

Re: David Charlesworth curved iron technique

#5

Jim in Burlington Ont.

Re: David Charlesworth curved iron technique

Jim in Burlington Ontario

>Non smooth is a big area. Are you getting ridges or tearout. I think your fine just staying with the origional numbers as it only relfects the integrity of the edge. You can always e-mail David and ask him.

Re: David Charlesworth curved iron technique

#6

Re: David Charlesworth curved iron technique

David Charlesworth

>Dan,

I think I suggested;

approx. 23 degree grind,

33 degree honing on 800 grit stone to produce wire edge, and do the shaping of the very slight curve,

35 degrees to polish the tip of the cutting edge on 8000 grit. {Followed of course by ruler trick, on 8000 stone to polish off the remaining wire edge}.

good luck,

David C

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