Johnford DMC Series double-column moving table bridge mills are created from a one-piece Meehanite cast iron bridge/column assembly that takes up less floor space than comparable C-frame vertical machining centers. Available in both moving table and sliding column (fixed-table) versions – ranging from 36 x 36 x 30-in. of travel up to 60 x 20 ft – these bridge mills have a long base casting with complete support of the table over the full 51 in. in length of Y-axis travel, allowing massive loads to be machined.
The Y and Z axes hold fixed loads at all times while the X-axis carries the only dynamic load allowing for tight machining and tight tolerances during high-speed machining operations. Because there is no table overhang, the X-axis pitch and yaw are eliminated. The spindle centerline-to-column distance is minimized offering further rigidity. The machine’s heavily ribbed cast iron construction provides long tool life and part surface finish. The combination of twin screw-type conveyors and a caterpillar conveyor ensures complete chip removal with little manual cleaning. Additionally, Finite Element Analysis (FEA) is used to design each bridge mill, simulating the effects of real-world conditions, including vibration, heat, fluid flow, and other physical impacts.
The DMC900-1500H small-frame series bridge mills feature a fixed column with a moving table, X-axis travel from 35 to 59 in., Y-axis travel of 35 in. and a Z-axis travel of 30 in., and table load capacities from 6,600 to 13,200 lb.
The DMC-1600-3100H medium-frame series offers a fixed-column construction with moving table, X-axis travel from 63 to 161 in., Y-axis travel of 51 in., and Z-axis travel of 31.5 in. with a table load capacity of 13,200 lb.
There are several DMC versions that offer multi-axis and 5-face solutions. The 2100S-6100 SH Series offers a fixed-column moving table with X-axis travels from 83 to 240 in., Y-axis travel of 70 in., and Z-axis travel of 31.5 in. while the 3100P-6100PH Series features the same fixed-column moving table with longer travels – X-axis ranges from 122 to 240 in. Y-axis is 90.5 in. and Z-axis is 31.5 in. Table load capacities range from 22,000 to 26,400 lb. and 22,000 to 35,20 lb., respectively.
The large DMC-4000x2800x800 – DMC-4000x2800+5-Face W-Axis Large Multi-Axis Series can handle a whopping 44,000 lb. of table load with an X-axis travel of 118 through 236 in., Y-axis travel of 110 to 189 in., Z-axis travel of 31.5 to 42 in., and W-axis travel of 39 to 79 in. on a fixed-column moving table.
Further, the SDMC Series custom-made unlimited-size sliding double-column series multi-axis, five-face series features moving-column and fixed-table gantry mills with X-axis travels ranging from 157 to 720 in., Y-axis travels of 72 to 236 in., Z-axis travels from 31.5 to 42 in., and W-axis travels from 39 to 79 in. Table load capacity is 614 lb/ft2.
Standard Accessories:
- Coolant system
- Spindle air blast
- Heat exchanger
- Full enclosure
- Twin screw type chip conveyors
- One chain type chip conveyor
- Operation box
- Tools, tool box and various manuals
- Rigid tapping
- Spindle oil cooler
- LED working lamp
- FANUC 0iMD controller
