. Science of railways . door sheet, back head, flue sheet andthroat sheet are drilled through standard jigs fitted withhardened bushings. This makes the assembling exceedingly easy, and so per-fect is the work that a long reamer can be run through a lineof rivet holes when the sections and sheets are in properposition. The following process is followed in assembling a fire-box: The inside sections, door sheet and tube sheet are firstbolted together with stay sheets in position. These insidesections are then laid up to the mud ring and the mud ringrtvet holes are drilled through the inside chan
. Science of railways . door sheet, back head, flue sheet andthroat sheet are drilled through standard jigs fitted withhardened bushings. This makes the assembling exceedingly easy, and so per-fect is the work that a long reamer can be run through a lineof rivet holes when the sections and sheets are in properposition. The following process is followed in assembling a fire-box: The inside sections, door sheet and tube sheet are firstbolted together with stay sheets in position. These insidesections are then laid up to the mud ring and the mud ringrtvet holes are drilled through the inside channels by meansof an air motor drill. All rivet holes are then reamed. Theinside sections with interposed stay sheets are then rivetedtogether by means of a special slim jawed portable hydraulicgap riveter, which is supported by a flexible cable near itscenter of gravity so it can be easily moved and inside channel section flanges and stay sheet seams arethen chipped and calked. LOCOMOTIVE APPLIANCES. 737. Method of Riveting Together the Channel Sections andStay-SJtieets by Means of Gap Riveter 738 LOCOMOTIVE APPLIANCES. The outside channel sections are then set in position be-tween the stay sheets and temporarily bolted in place, togetherwith the back head. All seam rivet holes are reamed, out-side sections are chipped and laid up to the mud ring andrivet holes are drilled through the outside sections from theinside of fire-box. The outside section seam rivets are then driven by meansof the gap riteter above mentioned. All back head T irons are applied to the back head, whichis then bolted in position and the corners laid up to the mudring. The rivets connecting the back head as well as the throatsheet to the outside sections are now driven by means of thespecial gap riveter. All mud ring rivets are next driven with a bull riveter,after which the corner plug holes are drilled and tapped andthe plugs applied. All outside seams between the flanges of the sections,t
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