Where can I get a spec on minimum bend radius for ASi cable. Have searched cable supplier web sites but cannot find detail.

You will have to contact the manufacturer of the cable you are using. It will depend upon the material used as various types are offerd. See the values copied from manufacturer X stating 75mm for the version I checked out.

Reversed bending strength (horizontal on broadside)
- Bendings 10 million
- Maximum acceleration 4 m/s²
- Maximum horizontal speed 4 m/s
- Minimum bending radius 75 mm
- Maximum length horizontal of cable 10 m
Torsional strength for > 10 million cycles (angle ±180° on 0.5 m)