A few useful shop hints on locomotive valve setting by Britton Jack

Author:Britton, Jack
Language: eng
Format: epub, pdf
Tags: Locomotives
Publisher: Montreal : Federated Press Ltd.
Published: 1920-03-25T05:00:00+00:00

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centre line of motion lies at an angle generally to the line "A.K," which passes through the centre of axle and the centre of main pin.

Scribe a straight line "F.H" representing the centre line of motion to pass through the centre of centre pop "A," and at an angle to the straight line "A.K," according to the blue print instructions.

No matter if the centre line of motion of eccentric rod coincides with the straight line "A.K," or if it is elevated or depressed with respect to same, the eccentric sheave keyways are laid off on the plate from the centre line of motion.

Let the straight line "F.H" Figure 106 represent the centre line of motion of eccentric rods for this our example. The straight line "A.K" passes through the centre of the keyway which is used to key the main driving wheel centre to the axle, as shown at "C."

Lay off a straight line " J.G" at right angles, to straight line "F.H" and passing through the centre of centre pop "A."

By tracing or by reference to blue print one can find on which side of the line "J.G," the centre of eccentric sheave keyways will occur.

Let us continue with a case of inside admission valves and indirect motion. This means, the keyways will occur on the other side of the line "J.G," when compared with the side on which the crank pin is situated.

Scribe a line "L.M" accordingly, parallel to "J.G" and on the side furthest from the main pin. The distance between the two lines measured along the line "F.H" must equal the lap of the valve, when rocker arms are of equal length.

It may possibly occur that "positive lead" is specified for both gears, or the valve to be "Line and Line" in both gears, or it may be that "Positive Lead" is required in one gear and "Negative Lead" in the other. In any case mark off from line "L.M." Take for example that positive lead in both gears is required.

Lay off a straight line "N.O" parallel to "L.M", the distance between the two lines measured along the straight line "F.H" being equal to the amount of "Positive Lead" required.

Note in all cases where " Positive Lead " is required that the lead is laid off from the line "L.M" in a direction away from the centre pop "A," whereas "Negative Lead" is laid off from

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