## 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
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
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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