Mechanical laboratory methods; the testing of instruments and machines in the mechanical engineering laboratory and in practice (1922)
Smallwood, Julian Chase · New York, D. Van Nostrand company · leaf 79
n the horizontal departure of any point on thecurve from the straight line shows the error in the drum motionat that point. When testing a drum motion for errors in an indicator diagrampreviously obtained, great care should be taken to reproduceall the operating conditions, relative to speed,… … Head End Crank End Drum Motion [Return Fig. 39.—Error Diagram from Drum Motion Tester. friction. Special care should be taken to reproduce the arrange-ment of guide pulleys. The effect of guide pulleys, especiallyif near the indicator, is similar to that of drum spindle frictionand imposes an…
Mechanical engineering
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