Direct Shear Machines (Pneumatic)

Pneumatic Direct / Residual Shear Machines utilize a pneumatic loading system, which eliminates the need to apply pressure to a specimen with multiple weights.

The machine uses two pistons to apply loads: a smaller diameter rolling diaphragm piston for lighter loads of 4lb to 100lb, and a larger diameter piston for loads up to 1,500lb. The maximum shear displacement is 0.8in (20.3mm). Strain rate is easily set using the digital thumbwheels and can be controlled from 0.0001—0.3in/min (0.0025—7.62mm/min).

A cabinet constructed from durable steel protects the machine against harsh lab settings and the included Teflon^®-coated anodized aluminum water chamber is designed to resist corrosion. Units include a 1,500lbf Load Cell and 15ft (4.6m) of air supply tubing. Direct Shear Boxes, sold separately, are Teflon^®-coated anodized aluminum to resist corrosion and available in a wide range of sizes.

Standard Pneumatic Direct Shear Machine uses dial indicators that measure vertical and shear displacement.

Digital Pneumatic Direct Shear Machine utilizes an S-type load cell to measure shear load. Horizontal and vertical measurements are taken by a Linear Variable Displacement Transducer (LVDT). Four-Channel Data Readout displays load and displacement values. Data is transferred to the user’s PC via Mini-USB and is uploaded in ASCII format to a spreadsheet program. This model also performs residual shear functions on soil specimens.

Features:

• Displays various test parameters
• Analog or digital consolidation/shear displacement models available
• Pneumatic loading system uses pistons instead of weights
• Self-contained unit's small footprint requires minimal lab floorspace
• Rugged all-steel construction

Included Items:

• Standard Pneumatic Direct Shear Machine
  • 0.5in Dial Indicator, 0.5 x 0.0001in (Range x Divisions)
  • 1in Dial Indicator, 1 x 0.001in (Range x Divisions)
• Digital Pneumatic Direct Shear Machine
  • Four-Channel Data Readout
  • Two 1in Linear Variable Displacement Transducers
  • GetData Software
• 1,500lbf Load Cell
• Tubing - 15ft (4.6m)

Accessories:

• Shear Box Counterbalance supports the top half of the Direct Shear Box to offset weight during testing
• Rolling Cart for Shear Machines positions the unit to an optimal height for testing and allows for mobility
• Direct / Residual Shear Data Acquisition Software records specimen information and real-time test data, calculate results and prepares reports following ASTM and AASHTO requirements
• Data Readouts are available in two and four-channel models and feature analog to digital converters for each channel
• 1in Linear Variable Displacement Transducer measures sample deformation or movement during soil tests
• Digital Dial Indicator - 0.6 x 0.0001in (Range x Resolution) quickly and easily converts inches to millimeters
• Digital Dial Indicator - 1 x 0.0001in (Range x Resolution) allows for the conversion of inches to millimeters at the touch of a button
• Nylon Alignment Screw is used with a Shear Box and can be ordered as a replacement part
• Shear Boxes used in testing direct shear of soil specimens
• Cutters are for trimming soil samples to a precise size
• Extruders allow for keeping soil specimens intact when removing