1 - 10 Machine Components 704-0212-209 VM Series Maintenance and Safety Manual
These are the recommended settings for tool holder specifications that will provide
optimal operation of a VM10G machine. Only a Hurco-certified Service Engineer can
adjust tool holder specification settings.
Table 1–9. Recommended Tool Holder Specifications for VM10G
AC Spindle Drive Unit
The spindle drive unit contains closed-loop control and controls the spindle motor using
an encoder. A microprocessor governs the closed-loop control, including monitoring.
The VM10G employs an open-loop control system that contains an Agree Signal for
spindle speed monitoring.
The following messages are output at terminals via relay contacts:
•Ready/Fault
• Main Spindle Messages
• Heat Sink Temperature Monitoring
• Motor Over-temperature
•Orient Complete
Electronic Spindle Orientation
The standard spindle on a machining center uses electronic spindle orientation. The
spindle is stopped at a fixed position through signals sent from an electronic encoder
assembly attached to the top of the spindle motor shaft.
The VM10G machine does not use electronic spindle orientation.
Proximity Sensor Spindle Orientation
Hurco machining centers with the Coolant-thru Spindle (CTS) option use proximity sensor
spindle orientation. This method of orientation uses a magnetic or proximity switch
mounted on the spindle, and either a screw on the collar of the spindle shaft, or a slot on
the spindle shaft as its target.
Specification Recommended Setting
Draw Bar Stroke 4.5 mm 0.18 in
Maximum Clamping Force 3.5 kN 787 lb
Air Seal Pressure 33 psi (at 2.5 bar)
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