Sliding actions for light flush doors suitable for sideboards, free-standing cupboards, etc. are shown in 233. The doors are usually composed of laminboard, particle board, etc. edged with hardwood all round (the top and bottom edging can sometimes be omitted in laminboard without detriment) and face veneered in the usual way. Figure 233:1 shows a two-door layout, 233:2, 3 alternative placings for three doors and 233:4 four doors; the arrows give the direction of travel. It will be noticed that in every case the doors overlap by the minimum amount necessary, from 3/4 in (19 mm) to 1 in (25 mm), otherwise the openings to the cupboards are restricted; while the gap between the doors in the thickness is kept as fine as the type of track and the projection of whatever handles are chosen will allow. Grooves about 3/16 in (5 mm) deep are also cut in the carcass sides to receive each door in its closed position, but these are often omitted in cheaper work. The layout for this type of door should be done full size, and the open and closed position of the doors carefully studied. In 233:1 the doors are equal in width, but the edge of the front door does not line up with the centre of the carcass. If the width of this door is made equal to the opening beside it then the the rear door will be correspondingly larger, which will automatically restrict the cupboard opening. In practice, the unequal appearance of 233:1 in a fairly long carcass is not noticeable with fairly quiet straight-grained face veneers, but might pose problems with very ornamental veneers, and a compromise will have to be made. Additionally, the position and projection of the handles will have to be watched. In light free-running doors it hardly matters if the rear door is masked by the front door in the open position, for the rear door can still be moved with light pressure of the finger-tips, but the handle-grips must be unobstructed in heavy doors. Buffer stops may also have to be fitted for very heavy doors otherwise pinched fingers may result.
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