Johnford UMC Series – Universal Machining Centers

5 Axis Mill/Turn Center with Built-In Trunnion Table

The Johnford UMC-730T is a combination high speed, high accuracy 5 axis trunnion table double column machining center with turning center capabilities.  This machine delivers outstanding overall performance and value for the complex machining of all types of complex multi-task parts.  The machine features strength from a heavy meehanite casting.  Precision comes from large roller type linear guideways in the linear axes and a unique, no backlash direct drive torque motor system in the tilt and rotary axes.  Large diameter double anchored and pre-tensioned ballscrews along with linear scales in XYZ and rotary scales in B and C allows full stroke positioning accuracy of +/-.0003” and repeatability of .0002”.  Weighing in at more than 29,000 lbs., stability and rigidity is ensured.

Along with precision comes speed.  Rapid traverse rates of 1969”/min in XY and 1575”/min in Z reduce non-cutting times.  Powerful servo motors are direct coupled to the large diameter ballscrews.  The Y axis features dual ballscrews.  All axes are driven at the center of gravity.  A precision, powerful, 31HP (Siemens) 15,000 RPM (18,000 RPM optional) integral spindle provides both low end torque and high speed finishing ability.  The spindle is available in both Big Plus 40 taper or HSK-63A.  The spindle is equipped with a hirth coupling to positively lock the spindle for turning operations.  In addition, spindle thermal compensation software is available.

At the heart of the machine is the direct drive torque motor tilting turn table.  The tilt / rotary table utilizes high torque, high speed, direct drive torque motors and hydraulic clamping. High speed rated rotation of 584 RPM (800 RPM max.) on the rotary C axis and 50 RPM in the tilt B axis reduces cycle time.  Since this is torque motor system with NO BACKLASH, the table delivers outstanding accuracy of +/- 8 arc seconds and repeatability of only +/- 5 arc seconds utilizing the standard high accuracy rotary scales.  A port rotary union to supply hydraulics or pneumatics for fixtures is standard.

The UMC-730T features an excellent mechanical design.  The fixed table gantry type design features slide system that is driven at the center of gravity (DCG).  DCG provides high speed movement and dynamic stability.  The machine design is compact and ergonomic.  The center trough, rear discharge chip conveyor allows complete and efficient removal of chips.

The standard 40 tool ATC is extremely reliable and changes tools in only 3 seconds!  The ATC is floor mounted and separated from the machine.  Located on the left side of the machine, the ATC is extremely accessible for easy maintenance and for changing out tools.  This design minimizes the machine footprint, saving valuable floor space.

An impressive list of standard features includes a center trough directly under the trunnion table that discharges chips into a caterpillar type conveyor utilizing high volume chip flushing, a 110 gallon coolant system, and a full machine enclosure to contain chips and  coolant.  The fully loaded Siemens 840D control is standard, providing 5 axis simultaneous machining, mill / turn functionality, ShopMill conversational, and high speed machining functions for high performance full 5 axis machining.