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Clamping Caul: Plain Pine Board Shaped to the Work (Adamson, 1889)
A caul is a board laid over glued work so the clamps press evenly over the whole surface instead of only under their jaws. D. Adamson (1889) uses a piece of good sound pine about 1 in. thick, shaped exactly to fit the surface: flat for a flat panel, convex for a concave one.
For veneering he warms it first. Wood can warp or twist, and burns if overheated; a zinc-faced caul (separate blueprint) lasts longer.
Source: D. Adamson, "Practical Veneering", Work, 5 October 1889, pp. 453-455.
Beginner
Unknown
Instructions
1
1
Read Adamson
Read Adamson
"The caul itself is either wood or metal, either of which must be shaped exactly to fit the surface to be veneered. Thus for a flat panel it must be flat, while for a concave surface it must be convex, and so on. ... For the material nothing is more suitable than good sound pine."
2
2
Cut the board
Cut the board
Cut a piece of good sound pine about 1 in. thick, large enough to cover the whole surface to be pressed. Thicker is no better, only waste. The length and width are set by the work (not given).
Materials for this step:
Pine Board1 about 1 in. thickTools needed:
Woodworking Saw
Unknown Dimensions3
3
Shape it to the work
Shape it to the work
Plane the face that meets the work to fit it exactly: flat for a flat panel, convex for a concave surface. A caul that is hollow in the middle presses only at the edges. How it is trued is not given (ours: plane, checked with a straightedge).
Tools needed:
Hand Plane
Straightedge4
4
Use it
Use it
Warm the caul (not so hot that it cannot be comfortably handled), lay it over the veneer with a sheet of slightly greased paper between, and screw down the hand-screws evenly until the glue oozes out at the edges. Leave it until the caul is cold, an hour or two.
Tools needed:
ClampsMaterials
1- 1 about 1 in. thickPlaceholder
Tools Required
5- Placeholder
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