Metal Finishing Guide Book


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of the booth (see Figs. 7 and 8). A properly sized booth for manual spray operations will give the operator and the finishing equipment adequate room in which to work. Adequate means enough space for the operator to Fig. 9. Open-front booth design. On the left is a poor booth move around, stoop design; the conveyor openings are too large and too close down, bend over, and to the exhaust chamber resulting in less air flow past the painter. A better design, on the right, makes use of entrance allow an even, fluid and exit vestibules. arm motion. For an automated application, the correct booth size will provide enough space for automatic equipment to operate effectively. This includes allowing for the operation of side-to-side and overhead reciprocators, and providing the necessary clearances for electrostatic equipment. During finishing, there should be sufficient velocity through the booth and past the equipment to keep it in clean operating condition. When conveyors are transporting parts through the booth, the booth size is directly related to conveyor speed. Minimum and maximum part dimensions determine the booth width, height, and depth. Acceptable booth width will allow at least 3 ft on either side of the part, at least 6 ft of work space for each operator in multiple-operator applications, and a minimum of 2 ft from all conveyor openings. To determine the width, measure the diagonal dimension of the largest part, including the fixture or pallet it is on, and add a 2- to 4-ft clearance on each end. This space permits the part to be turned if necessary and enables the operator to work comfortably. Adequate booth height will allow at least 2 ft above the largest part and allow for conveyor height or include a housing for the conveyor rail. Booth height is determined by the overall height of the largest part, Fig. 10. Booth placement. Booths should not be placed too close to building walls (a); plus 2 to 3 ft clearance. Add the place the booth front at a distance front he height of the holding fixture if the wall that is equal to the height of the booth (b); or part is moved by a conveyor. This place the booth next to the wall with a measurement gives the operator sufdirect connected air-input plenum. 829

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