Metal Finishing Guide Book

2012 Organic Finishing Guidebook Issue

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Fig. 9. Open-front booth design. On the left is a poor booth design; the conveyor openings are too large and too close to the exhaust chamber resulting in less air flow past the painter. A better design, on the right, makes use of entrance and exit vestibules. of the booth (see Figs. 7 and 8). A properly sized booth for man- ual spray operations will give the operator and the finishing equipment adequate room in which to work. Adequate means enough space for the operator to move around, stoop down, bend over, and allow an even, fluid arm motion. For an automated application, the correct booth size will provide enough space for au- tomatic equipment to operate effectively. This includes allowing for the operation of side-to-side and overhead reciprocators, and providing the necessary clear- ances for electrostatic equipment. During finishing, there should be sufficient ve- locity through the booth and past the equipment to keep it in clean operating con- dition. When conveyors are trans- porting 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. Accept- able 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 con- veyor openings. To determine the width, measure the diagonal di- mension of the largest part, includ- ing 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 in- clude a housing for the conveyor rail. Booth height is determined by the overall height of the largest part, plus 2 to 3 ft clearance. Add the height of the holding fixture if the part is moved by a conveyor. This measurement gives the operator suf- Fig. 10. Booth placement. Booths should not be placed too close to building walls (a); place the booth front at a distance front he wall that is equal to the height of the booth (b); or place the booth next to the wall with a direct connected air-input plenum. 209

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