## Geometry of Moulding Planes

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• So I ve collected a couple moulding planes, mostly hollows and rounds and I m noticing that the shoulder to the cheek to the left of the blade, which everyone
Message 1 of 2 , Dec 17, 2012
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So I've collected a couple moulding planes, mostly hollows and rounds and I'm noticing that the shoulder to the cheek to the left of the blade, which everyone says should be 30° off of vertical (because each plane does a 60° pass per arc so that the width of the blade is 1/6 of the full diameter, etc.) is typically nothing like 30°.  Have I just chosen poorly when picking out my antique planes, or the whole 30° cheek thing one of those nice in theory but in practice.... kind of things.

Avery
• The shoulder cutback has nothing to do with the arc of the blade. It was generally cut at that angle to allow the user to get as full a round as they could in
Message 2 of 2 , Dec 17, 2012
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The shoulder cutback has nothing to do with the arc of the blade. It was generally cut at that angle to allow the user to get as full a round as they could in complex moldings.

William Fariss
"Never look back unless you want to go that way"

From: Avery Austringer <avery1415@...>
To: medievalsawdust@yahoogroups.com
Sent: Monday, December 17, 2012 7:07 AM
Subject: [MedievalSawdust] Geometry of Moulding Planes

So I've collected a couple moulding planes, mostly hollows and rounds and I'm noticing that the shoulder to the cheek to the left of the blade, which everyone says should be 30° off of vertical (because each plane does a 60° pass per arc so that the width of the blade is 1/6 of the full diameter, etc.) is typically nothing like 30°.  Have I just chosen poorly when picking out my antique planes, or the whole 30° cheek thing one of those nice in theory but in practice.... kind of things.

Avery

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