- Full-coverage enclosure is lined with sound attenuating foam membrane.
- Electronic safety interlocks allow operation only with doors secured.
- Powerful 1hp motor rotates drum through slip-clutch protected chain drive.
The Los Angeles Abrasion test is widely used as an indicator of relative quality of aggregates. Test measures degradation of standard gradings of aggregates when subjected to abrasion and impact, in a rotating steel drum containing an abrasive charge of steel balls. Up to twelve balls are used, depending on gradation of test sample.
Gilson's design features integrated safety features, with total control from outside a sound enclosure. An electrical interlock allows the machine to operate only when the double-hinged lid is closed and a safety key is inserted. Drum is positioned for loading and unloading using a jog button while watching through a viewing window in the enclosure. Sound is absorbed by the heavy, painted steel enclosure with sound attenuating foam and membrane lining.
The 1/2in (12.7mm) thick welded steel drum has 28in (711mm) ID and 20in (508mm) inside length, and is mounted on a rigid welded steel support frame. The 6in (152mm) wide opening for introducing and discharging sample has a bolted cover which fits flush with inside contour of drum when tightened securely with a dust-tight gasket. A 3.5in (89mm) wide steel shelf of ASTM “preferred design” extends the full length of drum interior and is removable for replacement or maintenance.
A 1hp electronically controlled gear-motor rotates the drum at 30-33rpm via enclosed chain drive. Drum assembly rotates in flanged ball bearings with dust seals and grease fittings. Controller console with overload protection has large JOG and On/Off push button controls, and automatic counter stops rotation after a preset number of revolutions. Abrasive charge of twelve hardened steel balls is included. Heavy-duty catch pan with handle measures 24x26x2.5in (610x660x63mm) and is 19lb (9kg) net weight. The HM-70A measures 38x40x46.5in (965x1,016x1,181mm), WxDxH.
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