. Railway mechanical engineer . w Jersey and iias given entire satisfaction as regardsservice and output of work. The frame of the machine is constructed from secondhand bridge material and the few forgings required weremade in the blacksmith shop. A second hand 16-in. air brake cylinder was used and no material had to lie pur-chased to construct the machine, thus reducing the cost ofconstruction considerably. It is not the ])uqMse of the writer to advocate the con-struction of a machine of this kind instead of purchasinga regular punching machine, but rather to draw attentionto the fact that
. Railway mechanical engineer . w Jersey and iias given entire satisfaction as regardsservice and output of work. The frame of the machine is constructed from secondhand bridge material and the few forgings required weremade in the blacksmith shop. A second hand 16-in. air brake cylinder was used and no material had to lie pur-chased to construct the machine, thus reducing the cost ofconstruction considerably. It is not the ])uqMse of the writer to advocate the con-struction of a machine of this kind instead of purchasinga regular punching machine, but rather to draw attentionto the fact that one or more machines of this kind couldbe used to advantage in small shops, in repair yards, scrapyards, etc., where the expense of a regular punching machinewould be too great, or where other difficulties, such as obtain-ing the necessary power, proper foundation and housing,limited floor space and the like would prohibit the purchaseof a punching machine of the standard type. The pneumatic punching machine shown here does not. Pneumatic Punch Machine need a special foundation and, in fact, can lie made capacity is sufficient to punch 15/lt)-in. holes throughyi-in. iron or steel plates or its equivalent, with 90 lb. ofair pressure. The power is obtained from the regular shopair supply line with a IJs-in. hose of suitable length. Itis connected to the inlet part of a Westinghouse straight airbrake valve. (It was found that this style of valve is moredurable, easier to operate, and requires less repairs than doesa three-way cock.) The air brake valve controls a cvlinder. When air is admitted to tlie cvlinder, the 695 69o RAILWAY MECHANICAL EXGIXEER Vol. 9L No. 12 piston engages ;i lever having a proportion of 4/, to dies and punches are made of the same dimensionsand shape as those furnished with standard straight air Ijrake valve is operated bv foot power, a
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
