Mini Vertical Milling Drilling Machine Otmt. Slightly larger than a regular mini mill, the OTMT OT2213 X2 mini milling machine with its variable speed control at a range of 02,500 RPM, and 0.5 horsepower, can travel both forward and back, has a 45-degree head tilt both left and right, an easy-to-read dial which can read up to .0001 inches of movement, an impressive feeding system, and a coarse ...