You Ji HBM130

The You Ji HBM130 is a table-type CNC horizontal boring and milling machine with a Ø130 mm (5.1 in) boring spindle and a rotary table that carries 12,000 kg (26,455 lb). The spindle extends on a W-axis of 750 mm (29.5 in), and the table moves 3,000 mm (118.1 in) in X, or 4,000 mm (157.5 in) as an option.

A boring mill is judged by its table as much as its spindle. The standard rotary table, RT18/18, is 1,800 x 1,800 mm (70.9 x 70.9 in), with 1,800 x 2,000 mm (70.9 x 78.7 in) and 1,800 x 2,200 mm (70.9 x 86.6 in) as options. It carries 11 T-slots of 28 size at 160 pitch and turns at 2 rpm. With RT18/18 the table itself swings Ø2,540 mm (100.0 in) and the largest workpiece swing is Ø2,840 mm (111.8 in), so those are the clearances to check when a part hangs over the table edges.

Z-axis travel is 1,600 mm (63.0 in). Together with the W stroke it determines how far the bar reaches through a housing indexed on the table; boring from both sides by rotating the part halves the reach needed.

Spindle speed is 2,500 rpm. You Ji lists five attachments for the series: a manual 90° milling head, a manual universal milling head, a spindle supporting sleeve, a manual 90° extension milling head and a manual extension milling head. All the heads are manual, which means an operator fits them. The Y-axis travel is not shown in this page's table because the maker's catalogue and website print different figures for it.