![]() ![]() Obviously, if you are running at less than full engine rpm, your fuel use drops accordingly. This size of drill will use approximately 4.5 gallons per hour at full rpm. A tooling package (three reamers and a dirt drill head) costs approximately $8,000. Reamers may require periodic additions of hardfacing to their wear surfaces. Standard “dirt” tooling (drill heads and back reamers) typically last a year with proper maintenance. The cost for a set of drill stem can run approximately $28,000. Rod will have much less life if it is used in abrasive conditions, is over-steered, if threads are not properly cleaned, and if proper thread lube is not used. ![]() Depending on the abrasiveness of the boring conditions, a forged, one-piece drill stem can have 50,000 feet of boring life. What we’re presenting in these charts represents only averages, but here’s some advice from Vermeer on gauging these costs: Likewise, operator skill, soil conditions and the quality of your mud mixing program will have a big impact on your costs. So it’s impossible to predict with any certainty what costs will be. Sending a drill stem and tooling down through the earth is a journey into the unseen. To price your work accurately you have to add the direct costs to your overhead costs and factor in a profit margin as well. ![]() As in all of our O&O cost calculations, the final numbers you come up with on machine costs are not what you should charge for a job, but only your direct costs. ![]()
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