Classify the movement
Mark where the cable stays fixed, bends in a carrier or twists around an axis. Continuous bending and torsion are different loading conditions. If both occur, show their positions and whether they happen simultaneously.
Record the installation envelope
Provide the available bend radius, travel, speed, acceleration and cycle schedule. Add carrier layout, clamping points and exposure to oil or heat. Identify where movement starts relative to the connector and strain relief.
Agree a relevant validation
Ask for a cable construction and test proposal that matches this installation. Define the signal checks and inspection intervals for the sample. Compare any cycle-life statement with its stated test conditions before using it in a purchasing specification.
Frequently asked questions
Continuous flex vs torsion: can one rating cover both?
Continuous bending in a cable carrier and twisting around an axis are different loads. A continuous-flex statement alone is not evidence of torsion suitability. Describe where each movement occurs and request validation for the actual combination instead of assuming that a flexible cable suits a robot joint.
How should minimum bend radius and cycle-life claims be compared?
Keep the exact construction, installed radius, travel, speed, acceleration, temperature, torsion angle and failure criterion with the result. A cycle count without these conditions is not directly comparable. Request the relevant record or agree a sample test; this guide supplies no Qicable cycle-life rating.
Common mistakes
- Assuming a soft jacket means the cable is suitable for repeated motion.
- Applying a published cycle count to a different bend radius or movement.
What to include in your inquiry
- Movement sketch or short motion recording
- Bend radius, travel, speed and cycle schedule
- Carrier, clamping and environmental details
- Signal requirements and sample test conditions
Use this checklist to prepare a specification. Confirm the final assembly against your equipment documentation and the agreed drawing.