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    April 2021
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    Foreign feathers

    Foreign feathers

    The foreign feathers are made of the same material as the boards. Feathers from others, contrasting types of wood are rarely eye-catching. The wood itself has such an interesting pattern, that its additional emphasis rarely increases the aesthetics.

    The process of making foreign feathers is as follows.

    Drawing. A method of kneading foreign feathers from a board: a) cutting off the edges and splitting the board in half, b) blinking of all four planes, c) alternating feather cutting and side planing each time: 1 - board thickness 24 mm, 2 - thickness of a sharpened board, e.g.. 22 mm, 3 - kerf width for feather cutting, 4 - toughened layer 5 - pen thickness

    Cut the boards to the desired length and cut the sides with parallel cuts. Then cut the board lengthwise into two equal parts, thus reducing tray warping of the board. We process one of the front surfaces on a planer and then the entire board on a thicknesser, blasting it down to the thickness of e.g.. 22 mm. This thickness is then the width of the pen. The side surfaces of all boards intended for feathers are planed with a planer. This treatment should be carried out carefully, with low feed, so as not to tear the fibers in the vicinity of the knots with the opposite course. With a low feed, we get a clean plane with almost invisible waves. Then on a circular saw] with a set thickness of 4-5 mm, cut off two tongues with three planed planes on both sides of the board. Plan the side planes of the boards again on the planer and cut off two more feathers, until the boards are completely used up.

    When kneading foreign feathers, it is very important to carefully match their thickness to the width of the groove in the board. Too tight tongues stuck hard in the groove, causing edge damage, and even the splitting of the key. Too thin tongues cause unnecessary differences in the thickness of the boards at the joints and permanent loose joints.

    So what should be the thickness of the feather? If the width of the groove, measured with a caliper, is e.g.. 4 mm, then the thickness of the pen should be 3,7 mm. After varnishing, its thickness will increase to 3,8 mm; therefore there will be enough slack 0,2 mm. Due to the accuracy of the tongue and groove, the permissible tongue thickness may not be less than 3,5 mm. Practically, without calipers, the thickness of the pen should be this, that it can be pressed into the groove with your fingers, but it didn't fall out of it by itself.

    When determining the number of boards intended for feathers, do not forget about knot drop and some knot reserve.. The ends of the feathers should be cut at right angles. This is achieved by shortening the whole boards to length. Finished feathers must not be shortened.

    We carry out the finishing of the boards' surface, as already mentioned, before assembly and in a horizontal position. The finished boards are nailed with wheeler nails, 30-35 mm long, obliquely, through the internal projection yes, in order not to damage the varnish coat with a hammer.

    Cladding boards joined with a foreign tongue are not suitable for horizontal cladding exposed to direct weather conditions.


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