This involves working with drill pipes which, on the one hand, have an internal thread on both sides (beginners) and, on the other hand, have an internal and external thread (socket and pin) and are bolted together directly. The drilling process is carried out “rotationally” and “flushing”. At the end of the drill pipes, there is either a ram with a “lost” ram tip or a “lost” impact drill bit with flush holes. Alternatively, a screwed drill bit with flush holes or an annular drill bit can be mounted on the drill pipe.

• The plug end with a threaded outlet connects the hammer drill to the flushing shaft. The impact energy of the hammer drill goes to the flushing shaft via the ram hood onto the drill pipe, either via the ram shoe onto the “lost” ram tip or the “lost” impact drill bit, or onto the ring or impact drill bit firmly screwed to the drill pipe.
• The purge medium air or water is directed into the drill pipe via the flushing head and exits again through the flushing holes in the “lost” ram tip or the impact drill or ring drill bit. The bottom of the borehole is flushed free and the drill bit is ejected upwards through the annular space (free space between drill pipe and borehole wall) with the flushing medium.
• The “lost” ram tip or impact drill bit is pushed off when the drill pipes are pulled out and remains in the borehole. The fixed drill bit (percussion drill or ring drill bit), on the other hand, is pulled out with the drill pipe.

Drill pipe

The drill pipes are manufactured in our company from two components. The sockets and pins are made of tempered steel and can be surface-hardened as required. The pipe itself is made of mild steel and has a wall thickness of 10 mm as standard. The components are connected using the friction welding process in our friction welding system and have proven to be highly resilient in practice. The drill pipes are available in various lengths and diameters. Standard lengths:
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• NL 500 (socket/sleeve) | NL 1000 (sleeve/sleeve)
• NL 500 | NL 1000 | NL 1500 | NL 2000 | NL 3000 | NL 4000

Flushing head

With the aid of the flushing head, which consists of various components, the flushing medium air or water is directed into the drill string. This causes the drill bit to be guided upwards in the annular space. The use of one-sided irrigation creates another positive effect: Sand and clay from penetrating the drill string is prevented. The flushing heads are made of tempered steel and are also surface-hardened. The image above is just an example. There are many different types of flushing heads in our range. We are also happy to personally advise you on specific requirements based on your circumstances.

Lost tip

The lost tip is made of gray cast iron and is therefore cost-effective and highly durable. It is mainly used for core drilling in very deep areas. The drill does not overheat during this process.

Zipp Industries GmbH & Co. KG has had good experience with the diameters 88.9-152.4 mm based on many years of knowledge. The copies given are available in left and right form. Versions:

• Lost tip with spade cutter driver — with or without flushing hole — optional with check valve
• Lost tip with spade cutting width driver — with or without flushing hole — optional with check valve
• Lost tip with cross-cutting width driver — with or without flushing hole
• Lost tip with bayonet lock available as a cross or spade blade

Ramming shoe

The purpose of the ram is to pick up the lost tip and protect the drill pipe. The locking of the lost tip depends on the impact device used and on whether the customer wishes to reuse the drill bit.