A course in structural drafting; . n ordering,des- ignate weight or 5 Ql 9^64 1 5 ll \ 3^ fe ^ thickness want- 36^ 113^ u ^ ^ U u ed, but not both s 3 \\ u u u « In calculating 4 5 2-913 1 3 li. li f 2f A ^ the areas and 8^ - •?•1 ./4 7 ^^ 21 7 u 2^ weights of the s -^ 422 1 3 u « u various sections -6 A 16 « « « u here shown, thefillets are dis-regarded. 3 s 921 ?.-3 64 a] 1 64 l-?g .* 1 2 u 1 ! CHAPTER II. RIVETS AND SPACING All structural work is held togetherby rivets or bolts, the former nearly al-ways put in
A course in structural drafting; . n ordering,des- ignate weight or 5 Ql 9^64 1 5 ll \ 3^ fe ^ thickness want- 36^ 113^ u ^ ^ U u ed, but not both s 3 \\ u u u « In calculating 4 5 2-913 1 3 li. li f 2f A ^ the areas and 8^ - •?•1 ./4 7 ^^ 21 7 u 2^ weights of the s -^ 422 1 3 u « u various sections -6 A 16 « « « u here shown, thefillets are dis-regarded. 3 s 921 ?.-3 64 a] 1 64 l-?g .* 1 2 u 1 ! CHAPTER II. RIVETS AND SPACING All structural work is held togetherby rivets or bolts, the former nearly al-ways put in hot. When the work isto be riveted together in the shop theheads of the rivet are shown full onthe drawing, but the body need notbe dotted. If it is to be riveted in thefield the draftsman draws a circlethe size of the hole and fills it II. Convenient signs have beenadopted to show the manner of rivet-ing desired whether full heads orcountersunk head is here given, Fig. 12. Inside Radius of Shell 6llii!K /5. Fig. 12 Beveled Edges- A side view of the full head shouldbe shown as a half circle, Fig. 7. There are several forms of rivet heads among which are the flat, the cone, thebutton, the steeple and the of the rivet is carriedout to several degrees, depending muchon what the conditions in which thework is to be finished. The word countersunk means sim-ply the tapering of the hole outward andforcing the hot rivet to fill it and theexcess of material remaining a smooth surface is required thisexcess must be cut off, and. the term,countersunk and chipped, arises. Several degrees of finish is notedin the standards adopted for the useof designers by concerns making orusing structural steel but nearly everydrafting room has its own list. Fig. 13 gives some sizes of rivets andit will be noted that the angle of thecountersunk head is generally drawn60°. The Conventional Rivet Signs aremade up from the books of the Co.
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