There are many small, portable drilling machines
manufactured all over the world that I would classify as wannabe drills-drills
that are purchased by well-meaning nonprofit charities, church groups and
others to drill water wells in developing countries.
The
simplest method of starting a three-phase pump motor is by closing a contactor
and allowing the motor to start at full voltage, or “across-the-line,” as it is
called.
Walt Gomolka, of Sano Drilling in Pennsylvania, conducts coring for coal exploration to depths of 1,500 feet, using NQ wireline with a Mobile Drill B37.
Consider this scenario: You go to a flea market,
and spot an electric motor that looks similar to the one on the wash-down pump
in your barn that is starting to make noise.