Abstract
ABSTRACT AN M-2 Gleaner combine was instrumented so that signals from the loss monitoring system could be observed and recorded. Loss densities were measured at uniform distances behind the cleaning shoe for a typical range of harvesting speeds and cleaning fan settings. When calibrated for an ''average condition of medium ground speed and fan setting, the monitor under estimated shoe loss at high forward speed and high fan setting. Rearwards displacement of loose grain was affected by both fan setting and ground speed. For the test combine, a superior location for monitor pads appeared to be 30 to 40 cm behind the rear of the shoe. The number of loose seeds available for the sensor pads to monitor did not remain a constant proportion of loss as groundspeed and fan setting were changed. Sensitivity problems were also observed in data relating the number of seeds impacting pads to indicated loss signals produced by the monitoring system. For the test machine, the loss distribution was also skewed heavily to the left, further complicating the issue of selecting an appropriate location to mount sensor pads.
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