Drake Manufacturing Grinding System TE-LM2 Internal and External Thread Grinding Machine DRAKES GS:TE-LM2(Grinding System: Thread External/Internal-Linear Motor) The Drake GS:T-LM2, is available with a work envelope of 350mm diameter with lengths up to 2 meters. It can be equipped with a power wheel helix (A-axis) and for grinding external (+/- 35 degree lead angle) and internal threads (+/- 10 degree lead angle), right or left hand. This new grinder will enable us to serve a wider range of customers - especially those producing larger gears and worms, and longer lead, feed and ball screws.