(d ) CORRECTING READING FOR SAG

Once the indicator bar sag is determined, it should be permanently stamped on the bar. This true sag must be accounted for when determining sweep readings.

To correct your sweep readings for sag, subtract twice the amount of true sag from the bottom reading (B) and correct the side readings (R & L) by subtracting the amount of the sag. Sweep reading for an 8 mil vertical offset before making correction for a 3 mil indicator bar sag would be as shown in (b) As shown in (c) and (d), correct sweep readings for indicator bar sag (amount of sag was 3 mils):

B = ( + 10) - (-6) or +16 R = ( +5) - (-3) or +8 L = ( +5) - (-3) or +8

FIGURE 19A through D Illustrative procedure to determine the amount of sag in an indicator bar (bracket) (Courtesy Reference 3)

9. If the motor can be turned down from the end opposite the end from which the measurements are taken, do so. Regardless, always release the strap wrench or spanner bar before recording each 4-point reading.

10. Obtain center zero dial indicators or revolution counter indicators or carefully note all indicator movements with a mirror to assure, for example, that 0.090 in was not really —0.010 in. The algebraic sum of horizontal and vertical readings should be near equal.

## Renewable Energy 101

Renewable energy is energy that is generated from sunlight, rain, tides, geothermal heat and wind. These sources are naturally and constantly replenished, which is why they are deemed as renewable. The usage of renewable energy sources is very important when considering the sustainability of the existing energy usage of the world. While there is currently an abundance of non-renewable energy sources, such as nuclear fuels, these energy sources are depleting. In addition to being a non-renewable supply, the non-renewable energy sources release emissions into the air, which has an adverse effect on the environment.

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