Hand Cut

This is not a true woodworking joint in the conventional sense, since it does not physically attach one component to another. The rule joint comprises two moulded edges, one on a fixed table top and the other on a hinged leaf, that are designed to pivot, one around the other, as the leaf is raised and lowered. Its function is to conceal special back-flap hinges screwed to the undersides of the top and leaf. This type of hinge has flaps of different length, the longer one being screwed to the leaf. Rule-joint mouldings are cut before the final shaping of the table top and leaves.

knuckle gauge lines

1 Gauging the edges

Set a marking gauge to match the radius of the hinge knuckle, and scribe a line along each edge to be moulded, working from the undersides of both components. Continue the lines just onto the neighbouring edges.

Hand Cut Wood Joints

2 Marking the rabbet

Reset the gauge to the depth of the joint rabbet — about 3mm (1/sin)-and scribe similar parallel lines, working from the face side of each workpiece. The distance between the two gauged lines represents the radius of the rule joint.

-radius dimension -

3 Marking the width

With a cutting gauge set to this radius, scribe a line across the face side of the fixed top and across the underside of the leaf. Mark the edges similarly, and hatch the waste.

Woodworking Knuckle Joints

lines

lines

-radius dimension -

Wood Turning Depth Gauge

face side table top

UNDERSIDE

face side table top

UNDERSIDE

ta8letop rabbet

Alternate Drop Leaf Joint
drop leaf

ta8letop rabbet

4 Marking the radius

Using the scribed lines as guides, draw the rule-joint radius on each edge. Cut a card template for marking the leaf.

Knuckle Joint Woodworking

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Wood Working for Amateur Craftsman

Wood Working for Amateur Craftsman

THIS book is one of the series of Handbooks on industrial subjects being published by the Popular Mechanics Company. Like Popular Mechanics Magazine, and like the other books in this series, it is written so you can understand it. The purpose of Popular Mechanics Handbooks is to supply a growing demand for high-class, up-to-date and accurate text-books, suitable for home study as well as for class use, on all mechanical subjects. The textand illustrations, in each instance, have been prepared expressly for this series by well known experts, and revised by the editor of Popular Mechanics.

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