Large VMC
Source: CHEVALIER - Chevalier Machinery, Inc.
The 3060 and 3072 VMCs use a floating type tool discharge system, which puts the unclamping force of about 6600 lb on the
CHEVALIER - Chevalier Machinery, Inc.d 3072 VMCs use a floating type tool discharge system, which puts the unclamping force of about 6600 lb on the main structure of the spindle, not on the bearings. Powering the machine is a 30 Hp spindle motor with a 2-speed transmission system which delivers full power at 209rpm. Models can be ordered with a gear drive and high torque spindle motor or belt drive with 8000 rpm. The tool magazine uses bi-directional logic to determine the shortest distance to the selected tool and is now conveniently mounted sideways to eliminate workpiece interference. The entire structure rides on heavy-duty four-track saddle guides, designed for even weight distribution and reduced slide deformation.
Large diameter (2 in.) class C3 ballscrews are used on all three axes. These are anchored by pre-loaded double nuts and directly coupled to the servo motors by flexible couplings for minimum backlash and improved positioning accuracy. The ballscrews are pre-tensioned to prevent thermal growth that usually leads to cutting inaccuracies.
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