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Size of a Roadheader

The road header is a machine used for tunneling. It comes with a drum mounted on the base which is fitted with a cutting head. As it turns, rock or ore is excavated. The machine is used mainly for mining and in railroads.

SLB-350S Road Header Sizes

The machine is 18m long and 4.8m high. The cylinder width is 3.4m (3.2m) and the weight is 120 tons. The cutting motor is 350/350kW-4/6P and the under cut is 0.45m. The maximum cutting width is 8.8m. The maximum cutting height is 8.8m. The machine is designed for excavating soft and medium hard rocks.

SLB-300S Road Header Specs

The SLB-300S is 13.5m long and 4.8m high. This road header is 3.4m (3.2m) wide with the crawler and it weighs 90 tons. The maximum cutting edge width is 8.3m and the maximum cutting height is 8.8m. The under cut is 0.45m and the cutting motor is 300/200kW-4/6P.

The SLB-300S is designed for use in different geological conditions. It can be used on rocks up to 100MPa. The machine also has a variable drum rotation speed. This means it can be used in unique geological settings.

MRH-S300 Road Header Sizes

The MRH-S300 road header is 20.8m long and 4.7m height. The width is 4.0m (3.1m) and it weighs around 95 tons. The cutting motor is 300/150kW-4/8P and the under cut is 0.45m.

The cutting height is 6.5m and the maximum cutting width is 7.5m. The MRH-S300 is used for low vibration tunneling. The unit comes with a 300kW 2-speed motor and a drum rotation speed thatcan be adjusted.

MRH-S200 Road Header Specs

The MRH-S200 road header is 11.5m long and 3.85m height. It is wide and weighs 49 tons. The cutting motor is 200/110kW-4/8P and the under cut is 0.35m. The maximum cutting height and width are 6.0m and 6.4m respectively. The RH-S200 is designed for excavating soft and medium rocks.

MRH-S100 Road Header Specs

The MRH-S100 has a 100/60kW-4/8P cutting motor and an under cut of 0.25m. The maximum cutting width and height are 5.1m and 4.5m. It weighs 27 tons and is 2.8m (1.9m) wide. The height is 1.8m and is 12.1m long. The motor included allows it to be used for various mining excavations.

The different road header sizes and specifications are necessary as mining operations are very diverse. If you need one for a project, there should be one that can handle whatever your needs are.

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Dimensions of a Fresno Scraper

Dimensions of a Fresno Scraper

Since its invention in 1882, various Fresno scraper sizes have emerged. However, the one invented by James Porteous came with a front board measuring 8 feet wide by 2 feet high and fitted with metal cutting edge.

Porteous’ design also had a short end board. There was also a tailboard where the operator would stand. Dirt was hauled by folding the front board. The hauled dirt would be stored by the end boards.

History

Porteous invented the scraper because he saw how the Central San Joaquin Valley depended on irrigation. As Porteous worked on his design, he revised it numerous times.

He even exchanged ideas with Abijah McCall, Frank Dusy and William Deidrick. Those three inventors were designing their own scrapers, but Porteous bought the rights to all their designs. Thus Porteous got the sole patent for
the Fresno Scraper.

From 1884 to 1910, several Fresno scrapers were created at the Fresno Agricultural Works. The scraper would be used on road and railroad grading, construction, land leveling and agriculture. The scraper also played a role in the building of the Panama Canal. It would also be used during World War I. Eventually the design concept would spread and influence other earth moving equipment.

Design and Usage

While the Fresno scraper size would change, its basic design remained the same. The device laid the foundation for the contemporary earth moving scrapers. The Fresno scraper was notable for being able to move and scrape soil. It could also discharge the soil at a specified depth. It meant the volume that could be handled quadrupled.

The blade would gather the soil. It would run on a bowl that could be modified to change the bucket angle to the ground. This allowed the scraper to deposit dirt to low areas. The concept revolutionized the industry. Such was the impact that it influenced the design of modern earth movers.

Other Information

Porteous got Patent No. 261,759 for his invention, which was called the dirt scraper. It later became known as the Fresno scraper after Fresno, Los Angeles, the city where Porteous invented it. To this day the shop that Porteous created is still running.

Whatever the differences in Fresno scraper sizes are, one thing is certain: it is one of the most vital civil engineering and agricultural tools ever made. In 1991, the importance of the Fresno scraper was recognized when it was enshrined as an International Historic Engineering Landmark.

Capacitance Meter

Capacitance Meter

The capacitance meter is an apparatus used to measure capacitors. Capacitors have different features, with some able to function as a volt meter and check the temperature. Depending on the capacitance meter specifications, the device may be able to check inductance as well.