PEB contractors should switch to core drilling and hydraulic punching
cases holes on connecting components need to be drilled with reference to each other to get perfect matching at the time of erection.
Change of Mindset
Transporting of long and heavy steel structures to & from stationary drill machines in plant requires large manpower, help of material handling equip-
Objection to Change
Whereas most fabricators know about this technology, there are still some who haven’t heard of it. Many of those who know have apprehension on economical feasibility of the use of core drills. They have surely tried or heard of experiences from those who tried core drills on ordinary magnetic drilling machines made for use with solid drills. Life of core drills when used on such machines would definitely be below expectancy.
Core drills have multiple cutting tips and need special care in usage so that the cutting load is evenly distributed on all tips. Ordinary magnetic drilling machines are chosen over specially designed machines for use of core drills only on the basis of price to save initial investment. This eventually costs more as more number of cutters are required to be used. It also results in frequent breakdowns involving regular expenses and loss of work. This together is the main rea-
Timely completion is becoming more and more important and it is high time for all PEB contractors to switch over to core drilling and hydraulic punching for their drilling applications. When selecting the machines, a word of caution is to use portable magnetic drilling machines from reputed brands designed for the use of core drills.