When installing sewer systems, holes must often be milled in the pipes in order to be able to insert inlets and outlets.When installing sewer systems, holes must often be milled in the pipes in order to be able to insert inlets and outlets.
This is a demanding task, because the radius must first be drawn in and then cut out precisely so that the inlets and outlets can be inserted accurately and absolute tightness can be guaranteed. For larger holes, we offer the Manhole Fabrication Center (MF 200), which can mill holes from 90 to 2500mm. The Krah Group has now additionally developed a mobile hole milling machine that can mill hole diameters from 150 to 500mm continuously. This hole cutter can be used for solid wall pipes as well as for profiled pipes. For solid wall pipes, a minimum wall thickness of 10mm is required.The maximum wall thickness or profile height, in which the holes can be made, is 140mm. The hole miller can be used on pipes with a diameter of DN/ID600mm to DN/ID3000mm.
It is suitable for both fabrication and construction site use, as it is mobile and easy to handle due to its light weight. Another advantage is that it eliminates the need to mark out the diameter, so mistakes can no longer happen, as this is a very precise and demanding job. The result is an exact, circular cut-out that no longer requires any finishing work. Since the hole is machined completely from the outside, this work step can also be carried out on a pipeline that already is in operation. This means that there are no delays in the work process and pipes can continue to be laid and connected at the same time. The fast processing also contributes to this - to produce a hole diameter of 500mm, for example, only 4 minutes are needed.
A set consists of:
• Clamping and centring device
• Extensions for clamping device
• Crown drill
• Variably adjustable milling carriage
• Milling cutter
• Transport case
Jenny & Jochen, Krah Group