Micro-etched laminations and RF shielding supplied for pioneering miniature surveillance UAV

An innovative miniature surveillance helicopter is benefitting from the high precision manufacturing capabilities of Precision Micro, Europe’s leading photochemical etching specialist.

The miniature unmanned aerial vehicle (UAV), features an array of small, lightweight and extremely precise components manufactured by the UK-based company.

The UAV engine operates using miniature etched laminations, machined to tight tolerances. The motor laminations utilise Precision Micro’s ‘R bond’ technique, which uses the photo-resist protecting the material surface during chemical etching as the bonding agent.

This novel approach offers improved performance versus conventional punched, riveted or welded laminations.

Eliminating the option of conventional machining

A further engine component, which requires micro radii, can only be produced by combining Precision Micro’s photochemical etching and wire EDM technologies.

After chemical etching a 1mm thick blank, a 100-micron wire is used to profile the 0.1mm feature to sub 10-micron tolerances, negating the option of conventional machining techniques, such as precision presswork or laser cutting.

Another component that could not be manufactured by conventional means is the magnetic pole plates used to tilt the rotors and steer the nano UAV.

For the helicopter to effectively navigate obstacles and identify hidden dangers and enemy positions, the composition of the base metal must not be compromised during manufacture.

An ambient, non-contact process, photochemical etching does not induce any material stresses, meaning original properties remains unaltered throughout the process.

Communication integrity to the ground elements is maintained by the miniature shielding cans also manufactured by Precision Micro, protecting the sensitive electronics from EMI and RFI interference.

A highly flexible process, photochemical etching relies on digital tooling, which enables design iterations to be carried out quickly and economically.

With low set-up costs, the customer was able to try multiple components without incurring excessive charges and have them in hand in a matter of days.

This innovative UAV has fast become a key component in intelligence, surveillance and reconnaissance activities and Precision Micro is proud to be playing a part in its success.