Johnford DMC-6100S

The longest 40-taper machine in the DMC-S table is the Johnford DMC-6100S, with 6,100 mm (240.2 in) of X travel and a 6,200 x 1,500 mm (244.1 x 59 in) table. Overall length is 15,590 mm (613.8 in). Weight is 47,000 kg (103,525 lb).

Those are big numbers around a modest spindle, and the mismatch needs explaining rather than excusing. A BT-40 / CAT-40 spindle with 7.5 / 11 kW (10.1 / 14.8 hp), or 18.5 / 23 kW (24.8 / 30.8 hp) in built-in form, does not rough steel at a rate that justifies a 47-tonne machine. It does run small drills, taps and end mills at 8,000 to 12,000 rpm, and on six-metre aluminium or composite tooling that is the useful range. If the parts are steel and the cuts heavy, the DMC-6100SH is the same machine with the No.50 spindle.

Load capacity is the highest of the frame at 14,000 kg (30,800 lb). The table is still only 1,500 mm wide, so the rating suits long, narrow, dense parts or a row of fixtures rather than one broad plate.

Check three things before ordering. First, the building: 15,590 x 4,600 x 4,013 mm (613.8 x 181.1 x 158 in). Second, tool reach, because tools are limited to 320 mm (12.6 in) in length and Z to 800 mm (31.5 in). Third, the control, since the standard Fanuc 0i-MF PLUS can be replaced by Siemens SINUMERIK 828D, Fanuc 31i-MB PLUS or Siemens SINUMERIK ONE.