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C-Axis Stepping motor

Products > Machinig units
Milling, boring, engraving and positioning - C-Axis

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BAE50 Machining unit with stepper motor

When you mount a milling spindle to the Z-table, this is not yet an axis in the sense of the CNC-norm. Only if this spindle is programmable in its rotating angle, rotating direction and angle feed, it becomes another CNC-axis. As it rotates around the Z-axis, it is called "C-axis". This programmability requires the use of a stepping motor with relating axis controller as a drive. The advantages of this technology are enormous:

  • very low noise when working

  • drilling with low speed

  • milling with high speed 

  • thread cutting with normal thread cutters

  • angle positioning of tools

  • angle positioning of workpieces


See the technical data below.  

Notes on the use of the C-axis  (in German)
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Description

Stepping motors are particularly low, they have no powertransmission to the rotor (no collector with brushes and the like required) and they need no air cooling (no ventilator). They can be easily controlled, quickly stopped and are available in a big range of technical data. By integrating them into the Multi-Controller MCS and into the software nccad vast new ranges of applications are possible
The stepping motor becomes a machining unit, resp. C-axis, when it is connected to a spindle via power transmission and when it is mounted to the Z-table (see picture above). This is the type series BAE5x. It always consists of the following components:

  • Spindle with double bearing

  • Holder in different versions

  • Clamp with clamping nut

  • Motorplate with covering hood

  • 2-phase-stepping motor

  • Gear wheel set with tooth belt

  • Encoder for supervision and positioning

  • Connection cable and plug

  • Axis controller fof C-axis

  • Software-support inside nccad since version 7.5


The integrated encoder provides information about speed, standstill, or zero-position to the relating axis controller and allows intelligent error-analysis.
The C-Axis can be integrated into all machines with Multi-Controll MCS.

Older machines of the type KOSY2
can be retrofitted under certain conditions: they must be equipped with the electronics for the U-Axis, still, the software-support remains limited (e.g. no speed supervision).

Technical data

BAE 50

Stepping motor with 2,5A operating current

  • Gear ratio approx. 1:2,2
  • Torque max. 0,5 Nm
  • Speed approx. 20 .....3000 rpm
  • Noise level (without machining) 50...70 dB
  • Weight approx. 2,5 kg
  • Collet ER16, DIN 6499 B, 426E
    • recommended max 6mm
  • Speed control
  • Reference run 0° for angle positioning
  • C-AxisController must be integrated into control 


BAE 51
Customer specific, on demand

Different operating modes
can be differenciated by now:
- Mode "drilling/milling spindle"
- Run up spindle with/without ramp
- feedback when target speed has been reached
- rotation supervision with hard stop in case of error
- after switch off, fast ramp for stopping
- rotating direction to be selected/programmed
- support of direct manual operation (picture)

Mode "C-Axis"

- go to reference position (0°-position)
- drive spindle to angle position with/without ramp
- rotating direction to be selected/programmed

Mode "multi-axes operation"

- go to reference position (0°- position)
- coordinated travel with other axes e.g. together with Z-axis for thread cutting

Separation between spindle and motor has many advantages:

both elements can be modified,
the motor can be selected from a big range of versions and can be placed to the bottom,
it does not protrude the machine top.
The range of refs and the angle resolution can be varied through variable gear combinations.
Disadvantage: The tooth belt must be exchanged every now and then.


 
 
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