R12 6-asis robot arm

Description Technical Data

Description Technical Data

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Options

Encoders

The role of the encoders in the R17 and as an R12 level 1 option is as watchdogs. The loop is closed after completion of each individual motion which is not the same as servo control. The R12 encoder option comprises miniature optical incremental encoders fitted to each axis.

 

Without encoders the R12 will run accurately and indefinitely open loop without error thanks to micro-stepping drives and accurate transmission. But if the robot suffers a collision then the controller does not know and carries on with the program even though the robot could be out of position. Such collisions usually only occur accidentally during programming and rarely during normal running. It is necessary to run the calibrate routine after such a collision.

 

If the encoder option is not fitted ST provides a software solution in the form of a quick calibration check that can be included in every robot cycle or n cycles. If there is an error it is reported and the system stops. Note that the 6th axis itself does not have an encoder as the axis is too small and compact to fit one in. But this axis is wrist roll, very difficult to stall and can be individually recalibrated if necessary.

Specifications

Drives: High power micro-stepped hybrid stepping motors,
optional encoder watchdogs
Reach: 500mm/20ins in any direction; 360 degree waist rotation
Repeatability: 0.2mm (see note)
Payload: nominal 400g, max 800g (2lbs) at flange
(repeatability and speed degrade with increasing payload and reach).
Compliance:
droop at 250mm at nominal payload:
droop at max reach with max payload:
0.4mm
2.3mm
Maximum speed: Shoulder 180 deg/sec, Elbow 270deg/sec, Waist 180 deg/sec.
Standard cycle time: 2 secs.
Max torque for hand pitch or yaw: 2 Nm (repeatability figures degrade).
Max torque for 6th axis roll: 0.25 Nm (repeatability figures degrade).
Weight Robot 13.0Kg/29lbs Controller 11kg/25lbs
Power: 110/240v ac 420VA (standard controller)
Temperature range: 0 – 30C (wider range optional)
MTBF: 10,000 hours
Safety: Class 2 stop circuit, stall detect, risk assessment guide.
High intensity LEDs along the arm serve as awareness barrier.
Noise: Approx 40-50dB at 1m.
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