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.

مبتدئ

Unknown

التعليمات

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."

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).

المواد لهذه الخطوة:

لوح صنوبر1 about 1 in. thick

الأدوات المطلوبة:

منشار نجارة

أبعاد غير معروفة

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).

الأدوات المطلوبة:

فارة يدوية

مسطرة استقامة

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.

الأدوات المطلوبة: