406 



SPECIFICATIONS 



WORKMANSHIP. 



Workmanship. 



Riveted Work 

 Punching. 



Holes for 

 Field Rivets. 



Planing and 

 Reaming. 



Rivets. 



Riveters. 



Bolts. 



Neat Finish. 



Contact Surfaces. 



91. All workmanship shall be first-class in every partic- 

 ular. Due regard must be had for the neat and attractive ap- 

 pearance of the finished structure, and details of an unsightly 

 character will not be allowed. 



92. All riveted work shall be punched accurately with 

 holes 1-16 of an inch larger than the size of the rivet, and 

 when the pieces forming one built member are put together, 

 the holes must be truly opposite; no drifting to distort the 

 metal will be allowed ; if the hole must be enlarged to admit 

 the rivet, it must be reamed. 



93. All holes for field' rivets in splices in tension mem- 

 bers shall be accurately drilled to an iron templet or reamed 

 while the connecting parts are temporarily put together. 



94. In medium steel over ^ of an inch thick, all sheared 

 edges shall be planed, and all holes shall be drilled or reamed to 

 a diameter of */s of an inch larger than the punched holes, so 

 as to remove all the sheared surface of the metal. Steel which 

 does not satisfy the drifting test must have holes drilled. 



95. The rivet heads must be of approved hemispherical 

 shape, and of a uniform size for the same size rivets through- 

 out the work. They must be full and neatly finished through- 

 out the work and concentric with the rivet hole. 



96. All rivets when driven must completely fill the holes, 

 the heads be in full contact with the surface, or countersunk 

 when so required. 



97. Rivets shall be machine driven wherever possible. 

 Power riveters shall be direct-acting machines, worked by 

 steam, hydraulic pressure, or compressed air. 



98. When members are connected by bolts which trans- 

 mit shearing strains, such bolts must have a driving fit. 



99. The several pieces forming one built member must 

 fit closely together, and when riveted shall be free from twists, 

 bends, or open joints. 



100. All portions of the work exposed to view shall be 

 neatly finished. 



101. All surfaces in contact shall be painted before they 

 are put together. 



