OO-S-256K/GEN
3.5.7 Lifter, foot and knee. The foot lifter shall be mounted on the treadle bar. Knee lifter shall be mounted under the table. When specified
in the detail specification, the foot lifter with stand or knee lifter with table shall be furnished.
3.5.8 Table top. Unless otherwise specified in the detail specification, each sewing machine shall be supplied with a type I or type II table top (see 6.2).
3.5.8.1 Type I. The top of the table shall be constructed of laminated, thermosetting, decorative sheets with a particle board or multi- plywood core, unless otherwise specified in the detail specification.
Unless otherwise specified in the detail specification, the total thickness of the top shall be not less than 1-1/4 inches. Unless otherwise specified, the table top shall be not less than 20 inches wide by 42 inches long. All gluing shall be done with water-resistant adhesives. The table top shall be fastened to the stand.
3.5.8.1.1 Board, particle core. The particle board core for the top of the table shall conform to CPA A208.1. Faces shall be flat and smooth.
3.5.8.1.2 Plywood, multiple. The multiple plywood core for the table top shall be made of nine or more plys. Crossbands, face, and back veneers shall be balanced to prevent warpage of the top of the table. Faces shall be flat and smooth.
3.5.8.1.3 Covering, plastic. The plastic covering for the table top shall consist of a laminated, thermosetting, decorative sheet bonded to multiple plywood or particle board core. The reverse side of the top shall be a phenolic laminated, kraft backing sheet not less than .020 inch thick. The edges of the table top shall be self-edged with the same material used on the top surfaces or shall be edged with plastic edging of ethycellulose material. The plastic edging shall harmonize in color and pattern with the plastic covering for the table top.
3.5.8.2 Type II. The table top shall be constructed from solid lumber sections laminated together. The lumber shall be uniformly kiln dried without brashness, case hardening, or honey combing, in such a manner as to firmly set natural pitch and resin. Moisture content at the time of
assembly shall be between 8 and 12 percent. The lumber shall be further selected to eliminate such defects as knots exceeding 1/4 inch in average diameter, decay, mineral streaks, wane, shake, and splits. Any one of the following species of wood shall be used.
Ash, white Maple, hard or soft
Beech Hickory
Birch, yellow or sweet Oak, red or white
The outside dimensions of the table tops shall be as specified in the detail specifications. All tops shall be a minimum of 1-1/2 inches thick.
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