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“悬臂—77”型掘进机是在“悬臂—68”型掘进机的基础上由顿涅茨煤矿设计院和高尔洛夫市基洛夫机械制造厂联合研制的。它可以在硬度系数f<10的岩层中从下向上掘进仰角40°～90°直径1米,长约100米的立眼。 掘出来的巷道可以用来从采煤工作面往外运煤、通风、行人、输送材料以及在延伸立井和掘进盲井时向下部水平溜放矸石。该机设有沿予先打好的钻孔掘进巷道的定向装置。
The “Cantilever-77” roadheader was developed on the basis of the “Cantilever-68” roadheader by the Donets Coal Mine Design Institute and the Kirov Machinery Works in Kolhov. It can be drilled in the rock with hardness coefficient f <10 from bottom to top with an elevation of 40 ° ~ 90 ° and a diameter of 1 meter and a length of about 100 meters. Excavations of tunnels can be used to remove coal, ventilation, pedestrians, convey material from the coalface, and slide the gangue downwards as the shaft is being extended and the blindhole is being drilled. The machine has been laid along the pre-drilled tunneling directional device.