. 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 . byhand over the tapering end of the blowhorn stake (Figure98). The method of drawing the profile of the handle isshown in the elevation. At pleasure locate the point cwhere the lower end of the handle joins the cup. Theupper end of the handle fits closely under the wire atpoint a. Using the 45° triangle, draw lines from pointsc and a intersecting at b. Bisect line ab at e; with eb asradius, and e a
. 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 . byhand over the tapering end of the blowhorn stake (Figure98). The method of drawing the profile of the handle isshown in the elevation. At pleasure locate the point cwhere the lower end of the handle joins the cup. Theupper end of the handle fits closely under the wire atpoint a. Using the 45° triangle, draw lines from pointsc and a intersecting at b. Bisect line ab at e; with eb asradius, and e as center, describe a half circle connectinga and b. The amount cd is added for a lap at the lowerend. Then abed will be the profile and stretch-out of thehandle. After the edges have been turned on the handle, asshown in F, Figure 171, set the gauge on the small burringmachine (Figure 47) equal to the width of the edge run the work through the machine, having theupper roll turn the inner edge n against the handle, asshown at y in O. This operation will make the handlerigid, giving it a finished appearance after being formedinto shape. :200 SHEET METAL WORKERS MANUAL c£- rr ir~ ^ 1. -*> k ,3 02 O O S SHEET METAL WORK AND PATTERN DRAFTING 201 BURRING MACHINE The burring machine shown in Figure 47 is used forvarious purposes and is well adapted for turning smalledges on circular pieces of metal, edging hoops and rimsof covers, and bodies of sheet metal articles for machines are made in two sizes for general small machine is used for turning edges on smallcurves, and will burr edges up to T3e inch in width. Forlarge curves the large machine is preferable; an edge orflange up to y± inch wide can be turned on this machine. When burring edges for seaming light sheet metal, theexperienced workman will turn the edge as small as pos-sible, as he fully understands that it is almost impossibleto turn a wide edge evenly on thin metal without crimp-ing th
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Keywords: ., bookcentury1900, bookdecade1910, bookidsheetmetalwo, bookyear1918
