This micro-electro-drill made a hole in the cutter sw 18 (fi 4mm) within half an hour, and in other metals much faster, such as steel lamina of a thickness of 0,5mm – a hole 4mm was made in 2 minutes.
How was it made
vibrator is made of the relay UR-40 (24V-)
power supply is from the transformer from the cinematic projector, it gives tension on the vibrator and the operating voltage
flow of excavated material from tub to the tank was made, which was adopted of a car windscreen washer ROBUR, filled with the cosmetic kerosene
the tub is lifted manually (on the rack), the vibrator can be moved (on column), as shown in the pictures
operating current is 10A maximum (depending on the size of the contact surface of the electrode), the capacitor charging power has a capacity of 250 microfarads. The whole under safe voltage 24V DC
for easier work, halogen lighting 12V was mounted
Here are some pictures of the device and drilled hole.