Machining Center suits high-volume environments.

Press Release Summary:

With 2 independently operating 3-axis spindle modules, Xi-Mill with 3 x 3 MM option is capable of working interchangeably as single and dual work zone machine. Based on raised bed design with twin carriages, machine offers rapid traverse of 2,362 ipm, acceleration of 0.5 g, and direct-drive 15,000 rpm 30 hp motor spindle for handling wide variety of materials. X-axis travel starts at 157 in. with models available to 275 in. of stroke. Y and Z axis travel is 20 x 20 in.

Original Press Release:

Bertsche X-Mill High Velocity Raised Bed CNC Machining Center

Bertsche Xi-Mill in 3x3 MM configuration, is a Twin Carriage Dual Spindle High Speed Machining Center, built for speed, for use in a higher volume single and or dual work zone machining environment.

Xi-Mill with MM option is a high performance raised bed elevated twin carriage machining center that meets the needs of companies wishing to high speed mill a wide range of parts in volume. With two independently operating 3 axis spindle modules; two spindles are always machining either the same or two different parts. In "Dual Work Zone" mode each spindle operates independently in its work-zone. In "Single Work Zone" mode both Xi-Mill modules machine the part in tandem with each module executing a different part program. The Xi-Mill modules traverse at 2363 ipm (60 m/min), feeds to 1181 ipm (30 m/min), accelerates at 0.5g and have two 30hp (22kW) 15,000 rpm spindles. The moving 3 axis spindle module is mass minimized and built for high feed rate machining. The "Tool Centered Feed Force" design arrangement centers the axis feed force "line of action" on the cutting tool. The machine incorporates a number of Lean Manufacturing concepts that allows the operator to reconfigure the work holding table for either parallel processing identical or different parts. A single machine can handle virtually all the needs of a shop that needs to manufacture a wide variety of products on a single machine.

Based on a unique raised bed design concept the Bertsche Xi-Mill provides an extremely stable and stiff bed structure for the high speed traveling carriage. With a rapid traverse of 2362ipm, high acceleration and a direct drive 15,000-rpm, 30 Hp motor spindle this machine quickly machines a wide variety of materials. The X axis travel starts at 157" (4m) with models available to 275" (7 m) of stroke. The Y and Z axis travel is 20" x 20" (500x500mm). The X travel partitions into two equal sized work-zones for machining shorter parts.

The Xi-Mill is loaded with features that decrease operational costs. The machine is capable of working interchangeably as a single and dual work zone machine. As a dual work-zone machine the both spindles are constantly kept cutting. One operator services two load zones. Two spindles are always in production. Dual Work-zone feature includes a dedicated high speed direct pickup tool changer (recessed in the machine bed) and an operator station for each work zone. Left and right independently actuated powered operator doors automatically open at the end of a machining cycle allowing the operator to load the next group of parts while the spindle is machining in the other work-zone. The work-zone divider protects the operator but is light weight enough for easy removal when switching into single work-zone mode. Switching is fast and easy. The operator simply selects single work-zone from the console, removes the work-zone divider and the machine is ready to machine long parts. Both tool changer magazines are available for tool changing. Both Spindles can machine the part in tandem, each executing a different part program.

Other operational features include swift axis movement, very fast spindle acceleration/deceleration and high pressure coolant. Tools can be loaded into the toolchanger to set up for the next job while the machine is still machining. The Flex-table reconfigurable table feature allows the T-slotted table tops to be either horizontally or vertical mounting. Tables can be lowered or raised and add-ons such as repositionable work support, rotary indexers, flexible workholding mounts directly to the sidewall of the bed providing considerable fixturing flexibility. A traveling mist collection system helps meet new stricter OHSA requirements for a particulate free work environment.

Maintenance features include the elimination of hydraulic and lubrication systems reducing machine maintenance while prolonging coolant life. Maintenance screens provide current status and advise when service is pending and alert when past due.

Technology highlights include monolithic raised bed structure with low mass-minimized three-axis carriage FEA analyzed and optimized for maximum stiffness and high-speed performance. Raised carriage provides superior high-speed machine dynamics and eliminates problems with column sway and deflection found on C-Frame machines. Dual beam support arms fully support the YZ carriage and ram. The center of mass is very close to X, Y and Z servomotor and ballscrews. The Axes of motion are very close to the cutting tool. The moved mass is constant and the weight and size of the part do not affect machine dynamics. Excellent thermal stability is achieved with design symmetry.

Summary of Product Features:
o Twin Carriages to simultaneous machine two different parts on one machine
o Machine Large parts with two spindles from both ends when used as a single large work zone 20" x 20" (X travels from 157" to 275") [500x500 and X from 4-7 m]
o Dual work zones each equipped with a 25-tool capacity toolchanging system. A single keystroke switches machine from dual to single work zone operation.
o Rapid Rate of 2362 ipm(60mpm) in X
o High feedrate contour milling up to 1181(30mpm) ipm, high acceleration
o A high torque spindle 30 hp spindle with speed range to 15,000 rpm for both steel and aluminum power cutting
o Raised bed for better chip containment
o Low mass minimized three-axis carriage FEA analyzed and optimized for maximum stiffness for high acceleration and deceleration.
o Dual beam YZ carriage design fully supports the Ram.
o Versatile table design
o 4th-axis with feed and transfer mechanism for three sided machining of long extrusions.
o Environmentally Friendly Design through elimination of hydraulic and lube system.

For more information Contact: Bertsche Engineering Corporation (

Bertsche Engineering Corporation
Richard W. Bertsche
711 Dartmouth Lane
Buffalo Grove IL. 60089-6902
(847) 537-8757

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