. Design of a portable pneumatic riveter. t support. The maximum bending moment will evidently occurat one of the supports and is equal to the algebraic sum of thetwo moments at the support, or, Bince the loads are symmetrical M = M1 + Mg = - 15150 - 2490= - 17640 lb. in. Assuming a diameter of 2 inches and substituting the known values of M and d in (14) we have o - 32 x 17640 _ ooe;nn 1V / , S = - 22500 sq. in. o The bolt must be investigated for crushing andshear, hence, dividing the pressure by the area we have for thestresses —_= 11560 sq. x 2 34700 Ss =
. Design of a portable pneumatic riveter. t support. The maximum bending moment will evidently occurat one of the supports and is equal to the algebraic sum of thetwo moments at the support, or, Bince the loads are symmetrical M = M1 + Mg = - 15150 - 2490= - 17640 lb. in. Assuming a diameter of 2 inches and substituting the known values of M and d in (14) we have o - 32 x 17640 _ ooe;nn 1V / , S = - 22500 sq. in. o The bolt must be investigated for crushing andshear, hence, dividing the pressure by the area we have for thestresses —_= 11560 sq. x 2 34700 Ss = = 11°00 sq. values are safe for a toggle boltTthe relative motionbetween the surfaces in contact is slight and the speed is slow. TOGGLE BOLT is the top part of the frame and must be designed totake up the reaction of the plunger. It is eccentrically loaded,hence, assuming a section as shown in Fig. 13 and investigatingthe section, we find that the section has the properties tabulated -30- in Table VII. L //. Pig. 13. TABLE VII. I Ah2 No Area Mom. cc leg h I T 1 1* 1 • 5? 3• 2 2 7 3 6 05 95 7 0 Substituting the values of Table VII in (2) to (8) inclusivewe have P = 34700 lb. e = in. = 54700 x = 1265Q lb#/ in<1 s = 34700 x = 188C0 lb</ sq# in# g P = 54700 = 408o lb#/ sq. a H -31- Max. St = 15500 sq. Sc = 19650 sq. values are within the specified parts of the riveter for which no calculations have beenshown have been designed from judgement; for instance the cylinderports were designed so they would cast well. The valve wasdesigned for a good wearing surface, and the lever used foroperating the valve was proportioned so it would look well whencompared with the control lever. BILL OF MATERIAL One of the features of modern manufacturing is the standard-ization of parts so
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecttheses, bookyear1912
