What would this process be called? Aluminium heatsink used for mounting electronic components to , to conduct away heat to the air . Some sort of chisell cutting advance and repeat while still hot after casting/extruding?, surely not done cold?
The remaining uncut spine is about 4mm wide and the original bulk of metal must have been about 9mm wide to be cut down, each side, to a 4mm spine.
-- General electronic repairs, most things repaired, other than TVs and PCs
Diverse Devices, Southampton, England