. Railway mechanical engineer . Front View of Cutter Grinder and hobs with straight cut teeth. It is also adajited forgrinding fluted reamers and similar tools. The machine isequipped with a conical grinding wheel which presents buta single line of contact between the wheel and the work atany one time. The wheel may therefore be made to followaccurately the helical path of the tooth and grind the cuttingedge to the required form. There is always considerabledifficulty in sharpening spiral hobs with a flat face wheel which is inferior to the cone shaped wheel both as regardsaccuracy and free cu
. Railway mechanical engineer . Front View of Cutter Grinder and hobs with straight cut teeth. It is also adajited forgrinding fluted reamers and similar tools. The machine isequipped with a conical grinding wheel which presents buta single line of contact between the wheel and the work atany one time. The wheel may therefore be made to followaccurately the helical path of the tooth and grind the cuttingedge to the required form. There is always considerabledifficulty in sharpening spiral hobs with a flat face wheel which is inferior to the cone shaped wheel both as regardsaccuracy and free cutting. In grinding the teeth to the required helical i)ath, the ma-ihine imparts a combined traverse and rotar)- movement totiie cutter. The table on which the cutter is mounted canbe swivelled horizontally about an axis which theaxis of the spindle and grinding wheel. When grindingCurvex cutters, the table is swivelled at an angle to corre-. Pratt & Whitney Special Cutter Grinder spond to the helix angle of the cutter teeth. It is thenreciprocated in the usual way by means of a handle operatinga rack and pinion. At the same time a reciprocal rotarymovement is imparted to the cutter through a set of changegears selected to conform to the lead of the cutter. An indexing device is provided for successively bringingthe teeth in line for grinding instead of holding the backof the tooth against a spring stop. Another interesting fea-ture is the arrangement by which cutters of different sizescan be ground radially without resetting the head or surface of the grinding wheel is kept dressed to thecorrect shape by means of an accurately mounted is further made for adjusting this diamond fromtime to time so as to maintain the true cone angle of thegrinding wheel. The machine is arranged for wet grindingwhich is a feature tending to promote increased production. Meno Rust Remover and Cleanser A PREPARA
Size: 1239px × 2017px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
