2.0 System Descriptions 2.1 MMD Series Test Frames
minimal deflection under full loads at full velocity. Within each column are precision ballscrews. The ballscrews are preloaded. The ballscrews rotated synchronously driven by a precision motion control system. Overall, the system components provide an industry-leading system with extraordinary axial stiffness. Drive System The drive system for your MMD Series test frame resides within the back housing protected by a lightweight fiberglass housing. The drive system connects to the lower end of the ballscrews using a belt and pulley system. Motor rotation rotates the ballscrews synchronously which moves the crosshead up or down with excellent position control resolution. Load String The load string consists of the load cell sensor, clevis adapter and test fixture. The load cell is mounted to the crosshead using a set screw that secures the load cell to the crosshead surface. Starrett recommends using low-profile load cell sensors for material testing because of their excellent axial stiffness. Starrett recommends that your load cell sensor is attached to a base adapter. The base adapter is standard with ULC Series load cells and optional for MLC Series load cells. The base adapter helps ensure a proper surface mounting. The test fixture is mounted using the clevis adapter. The clevis adapter has an M16 thread and comes in either a 15.9mm or 31.8mm diameter. The clevis adapter threads into the load cell sensors. The test fixture slides onto the clevis adapter and is secured using locking rings and a grip pin. Communications Communications between the L3 Series workstation and your MMD Series test frame is via USB 2.0.
The Starrett MMD Series are twin column, electromechanical test frames designed for material testing applications. The MMD Series are bench top systems ideal for tensile, compression, shear, flexural, cyclic and other forms of testing applications. Three model test frames are available:
• MMD-10K Series • MMD-30K Series • MMD-50K Series
The MMD Series has been designed to be used with Starrett L3 software for material testing operating on an all-in-one, touchscreen computer. The MMD Series features include: • Precision motion controls including powerful motors with excellent acceleration and position resolution • High Axial Stiffness with granite base and adjustable deflection compensation and linear error correction • Pre-loaded ball screws and bearings and low-stretch belts for outstanding responsiveness and repeatability • Extra heavy-duty crosshead for testing loads up to 50kN • Data sampling from 1 to 2000Hz • USB communications • Interfaces for up to two (2) extensometers capable of exceeding strain measurement accuracies per ASTM E83, ISO 9513 and EN 10002-4. • Load measurement using IEEE 1451.4 TEDs-compliant load cell sensors with accuracies up to 0.5% of reading down to 1/1000 of load cell capacity. • Digital and analog I/O channels for interfacing with ancillary testing equipment or for incorporating programmable logic control • Easy to use fixture mounting for the many hundreds of different test fixtures and grips that may be used • Worldwide sales and service support Test Frame Your MMD Series test frame consists of a granite base, cast-aluminum base plate, two (2) extruded aluminum columns and a cast-aluminum top plate. The precision aluminum crosshead is engineered for
MMD /FMD Series System Drive System
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