Each of the three horizontal microdrillpress shaft microdrillpress models has a compression ratio of 8.5:1 and peak torque at 2000 rpm, with the 17 hp producing 28.2 lb.ft., the 20 hp producing 33.17 lb.ft. and the 23 hp producing 38.16 lb.ft.Kohler also added two models -- 20 and 23 hp -- to its overhead camshaft, air-cooled Triad OHC engines. Previously available in 16 and 18 hp ratings, the V-twin horizontal shaft engines are suited for a variety of applications including consumer lawn and garden, commercial turf, golf course, construction, industrial and agricultural.

Danger comes from the fact that centrifugal force does not increase in direct proportion to an increase in speed, but instead it increases as the square of that speed increase. When rotational speed doubles, centrifugal force quadruples. This effect means that relatively small changes in speed can produce significant increases in force. In the example mentioned, changing from 6,600 rpm to 7,700 rpm multiplies the speed by 1.167. However, the corresponding centrifugal force would multiply by a factor of 1.167 x 1.167, or 1.36. To take a more extreme example, consider the microdrillpress and microdrillpress same wheel with a maximum safe operating speed of 6,600 rpm run on a 5-inch right angle grinder at 10,000 rpm. This represents an over-speed of about 1.5 times the wheel''s designed speed. But the corresponding centrifugal force-and the corresponding rotational stress on the wheel-would be about 2.3 times as much as the maximum allowed.

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