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A concrete grinder is an abrasive machine for grinding and polishing concrete and natural stone. Concrete grinders can come in many configurations, the most common being a hand-held general purpose angle grinder, but it may be a specialized tool for countertops or floors. Angle grinders are small and mobile, and allow one to work on harder to ...
The structural properties of this material are similar to those of Portland cement-based mortars: it has an elastic modulus of 293.9 MPa, and a tensile strength of 3.6 MPa (the minimum required value for Portland-cement based concrete is approximately 3.5 MPa); [2] however it has a fracture energy of 170 N, which is much less than most standard ...
Their initial product was the MS6 hand grinder, which featured an electric motor with an attached flexible shaft. By the late 1920s, the company replaced the flexible shaft with an angular gearbox. In 1935, Ackermann & Schmitt introduced the first low-speed angle grinder, followed by the launch of the first high-speed grinder in 1954. [6]
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In April 2016, DeWalt created an Android-powered smartphone designed for building industry workers. It costs £379 ($544), is designed to survive a 2 m (6 ft 7 in) drop onto concrete, and has an operating range of −20 to 60 °C (−4 to 140 °F). [9]
The LL1, LL2 and LL4 size machines were soon to follow, giving Bryant the capacity of grinding internal diameters from .040" ID's to 88" OD's." [4] In 1986, Ex-Cell-O and its subsidiaries, including Bryant, were purchased by Textron. In 1988, Textron sold Bryant Grinder to a financial investment group, the Goldman Group. [4]