Feeler HT-30Y

A Y axis on the turret is what the Feeler HT-30Y adds to the HT turn-and-mill lathe. With it the driven tool can move off the spindle centreline, so the machine can mill flat-bottomed keyways to width, cut pockets and hexes, and drill holes that are not on a diameter, all in the same clamping as the turning.

Feeler builds the Y motion as a compound axis with a 30-degree stacked saddle design, and claims high rigidity, excellent straightness and load capacity for it. The maker says it minimizes path errors during milling or eccentric machining. The ball screw is C3-class, preloaded, and driven by a servo motor with coolant circulation to limit thermal deformation.

As a lathe, the HT-30Y matches the HT-30MC row for row in the published table. The chuck is 10 in, the maximum turning diameter φ356 mm (φ14.0 in), the turning length 705 mm (27.8 in). Bar capacity is φ78 mm through a φ88 mm bore on a JIS A2-8 nose, at up to 3,500 rpm. X travel is 260 mm (10.2 in), and there is an MT-5 tailstock, servo-driven according to the series text. The turret has 12 stations.

A word on the data. Feeler's table for this series has its Y and Z travel rows out of step with their labels, so neither is quoted here. The Y stroke, the Z travel and the driven-tool spindle rating are the three numbers to obtain before deciding whether a given milled feature fits.