. 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 . f flaring and straight articles is to inclose awire or iron rod of suitable size in certain of their wire can be laid in by hand or by means of the wiringmachine shown in Figure 45. Allowance for Wiring.—It is important to know theexact amount to be added to the height of the pattern forthe take-up of the wire. The amount usually added foithis operation is equal in width to two and one-ha
. 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 . f flaring and straight articles is to inclose awire or iron rod of suitable size in certain of their wire can be laid in by hand or by means of the wiringmachine shown in Figure 45. Allowance for Wiring.—It is important to know theexact amount to be added to the height of the pattern forthe take-up of the wire. The amount usually added foithis operation is equal in width to two and one-half times 190 SHEET METAL WORK AND PATTERN DRAFTING 191 the diameter of the wire. Another method is to allowthree-fourths of the circumference of the wire. When using tin plate and light sheet metal, it is cus-tomary to make no allowance for the thickness of themetal, but in wiring heavy plate an allowance must bemade for the thickness of the material used. The amountof material for covering the wire will vary according tothe thickness of the metal and the size of the wire to beinclosed and is found by the following rule: Add twice the diameter of wire to four times the thick-ness of Figure 165.—Biscuit Cutter, Wired in Top Edge. As an example, suppose in constructing a tank fromsheet iron TVinch thick, the top is to be reinforced byinclosing a %-inch rod; then the amount to be added tothe net height for wiring will be %X2 plus TVX4, equals1*4 inch. The most accurate and practical method to determinethe allowance for wiring is to take a narrow strip ofmetal and bend it closely around the wire with the will give the exact amount of material required. In wiring articles made from tin plate, Nos. 8, 10, 12,13, and 14, coppered or tinned iron wire is commonlyused. The amount of material to allow for inclosing theabove sizes of wire when using IC tin plate, and the width a *«* ^Ok-So 1 QQ 3 •01$ 55 hi °)i*p_ ^ 3
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Keywords: ., bookcentury1900, bookdecade1910, bookidsheetmetalwo, bookyear1918
