. Sheet metal workers' manual; a complete, practical instruction book on the sheet metal industry, machinery and tools, and related subjects, including the oxy-acetylen welding and cutting process . ll burring machine. After the bottom is cut from metal, then proceed toburr the edge in the following manner: Having made anallowance for a %-inch burr on the bottom, set the gaugeon the machine a scant % inch from the edge of the upperroll. This will allow for the take-up of the material after 202 SHEET METAL WORKERS MANUAL the edge is turned. Then holding the bottom in a horizon-tal position, pla
. Sheet metal workers' manual; a complete, practical instruction book on the sheet metal industry, machinery and tools, and related subjects, including the oxy-acetylen welding and cutting process . ll burring machine. After the bottom is cut from metal, then proceed toburr the edge in the following manner: Having made anallowance for a %-inch burr on the bottom, set the gaugeon the machine a scant % inch from the edge of the upperroll. This will allow for the take-up of the material after 202 SHEET METAL WORKERS MANUAL the edge is turned. Then holding the bottom in a horizon-tal position, place the edge of the metal on the lower roll,touching the gauge. Next bring down the upper roll untilthe metal is held firmly between the rolls. Then with thepalm of the left hand resting against the frame of themachine, grasp the bottom between the thumb and fin-gers, the ball of the thumb resting on the upper side nearthe center, with the fingers extended on the lower the hand in this position, holding the edge of thebottom firmly against the gauge, allow the metal to passbetween the thumb and fingers while revolving in the ma-chine. After the first revolution and while the machine. Figure 172.—Burring an Edge on Cup Bottom. is turning, the bottom is gradually raised until the edge isturned to the required angle. The correct position of the hand while burring edgeson flat circular pieces of metal is shown in Figure method of holding the disc will keep the metal fromwarping out of shape while turning the edge. The bot-tom is then slipped over the body and the cup soldered onthe inside, after which the handle is soldered in position,completing the problem. BRAKING TIN When constructing articles made from tin plate, sharpparallel kinks or wrinkles will often appear on the metalafter being formed on the rolls. This can be avoided if SHEET METAL WORK AND PATTERN DRAFTING 203 the sheets are taken before wiring and passed through theforming rolls three or four tim
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