Translation of "Hartes gestein" in English

Twist drills of this type are not suitable for drilling hard material such as rock.

These words were written—cut into hard stone—over 4,000 years ago.

Hard rock that has to be adapted to a complex infrastructure.

This page is about how the hard granite could be split and cut.

The town is also known as the granite city, surrounded by soft nature and hard rocks.

The second metamorphosed variety is likewise a hard rock, but without any crystalline structure.

They are the post-glacial remains of a cap of Cenozoic silcrete that once covered much of southern England – a dense, hard rock created from sand bound by a silica cement, making it a kind of silicified sandstone.

However, certain limitations had to always be accepted, especially when dealing with very hard stones, for example, granite, flint or quartz, which have to be screened in a dry coarse state.

For example, if the tool impacts on hard rock, the path or displacement to a complete stop is almost zero.

Whinstone is a term used in the quarrying industry to describe any hard dark-coloured rock.

The noise caused by the cutting head picks during operation is a clear example, especially when cutting out extremely hard rock.

This has occurred primarily in conjunction with MRBS and particularly in relation to Colliery Control Rooms and major machinery development such as the MRBS Hard Rock Tunnelling machine.

It was believed that if very hard rock were to be cut, higher water pressures than presently being used would be needed.

There had been a long development period both at the test site and underground on a production machine and it could now be stated that the use of high pressure water jets did enable some of the lighter and medium weight machines to cut quite hard rock.

You will see how massive sand dunes have solidified into rock over the millennia.

The BINE Projektinfo brochure "Electric impulses fragment hard rock" (13/2015) presents an alternative drilling procedure.

This layer is situated between a depth of 100 and 500 kilometres and contains even fewer hard stones.

If the milling cutters of the milling roller were to suddenly come up against particularly hard stone, problems occur in practice in construction machines with a conventional limit load control.

If the guide frame is arranged in a lower region of the pipe, a region below the pipe wall can be cut away by the obliquely guidable cutting apparatus in order for example to crush or remove hard stone such as a boulder located there.

Known drilling devices with a container for receiving the loosened material, so-called drilling buckets, are not suitable for drilling hard stone or rock, since the known drilling tools designed for hard stone or rock do not ensure a reliable conveyance of the ground material into the container.

The average daily tunnelling performance through hard rock and mountain overburdens of up to 1,000 meters was approx.

The BINE Projektinfo brochure “Electric impulses fragment hard rock” (13/2015) presents an alternative drilling procedure.

The HT14 system is useful in applications where high hourly production rates are achieved, high annual mining capacities are realized, and hard, highly abrasive material needs to be mined.

When developing the Chisholm Trail Parkway in the US State of Texas, they are used for routing work and reliably bite their way through hard rock.

Sometimes the sediment is well cemented, making a hard, uniform rock, prized for building stone, e.g. Hawkesbury Sandstone around Sydney.