______HSD Technological equipment for Automation _____________________________________
5801H0017 Rev. 02 _________________________________________________________ 87/98
13.3 “C” AXIS UNIT
ES919 and ES915 variants can be fitted with a C Axis unit.
The C axis unit rotates heads, gearboxes etc. fixed to the electro-spindle through 360° on the
assembly plane by means of a quick lock device and specially shaped drive pin.
Rotational movement is powered by a servomotor, rigidly mounted in line with a low-backlash
epicyclic gearbox.
A PNP, NC inductive sensor, “SC”, provides a zero position reference signal and allows the
assembly to be positioned quickly and accurately for tool release into the tool magazine.
C axis units can be Gear driven or Belt driven. Gear driven C axis units are available as separate
optionals for all “Short Nose” and “Long Nose” variants. Belt driven C axis units are not available
as separate optionals, but come pre-fitted, and only to ES919 ISO30 (7 kW or 8 kW version, 2
poles) Short Nose variants.
Choice of the C axis servomotor is left to the customer. The mounting flanges for Belt driven C axis
units are shown in section 7.6.2 .
For the overall dimensions and technical specifications of belt driven
C axis unit, see section 7.6 .
13.3.2 Gear driven “C” axis unit
Helical gears with automatic backlash elimination.
For installation instructions and technical specifications, see the manual delivered with the unit or
available from the HSD Technical Assistance Service (code HSD 5801H0019).
Main specifications for a servomotor giving 0.64 Nm at 3000 rpm (*)
Rated torque
67 Nm (*)
Starting torque
105 Nm (*)
Overall gear ratio
1 / 123
Total mechanical efficiency
0,85
Epicyclic gear backlash
3’
Positioning precision
5’
Gearbox input rpm
3000 rpm (4000 rpm max)
Rated gearbox input torque
2.5 Nm
Starting gearbox input torque
4 Nm
Weight
10 Kg (without servomotor)
(*) Specifications depend on the choice of servomotor.
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