Using a hard drive to cut a record

Written by: admin@makezilla

We stripped 8 hard drives down the ascertain the most appropriate actuator for our application.
 

Cutting the Groove

Having seen footage of hard drive actuator arm play music when connected to amplifier convinced us we could invert the process and use the actuator as the cutter head once we mounted an appropriate cutting tip.
Effectively reverse engineering from the digital realm to create an analogue result.
This image tests the theory, signal being fed to a hard drive and played back via a stylus resting on the arm.

Step 1: Hard drive actuators, early versions

We stripped 8 hard drives down the ascertain the most appropriate actuator for our application.

The arm from 4"drive as opposed to 2.5" drive allows more current resulting in greater amplitude this equals higher volume.

We built three versions of cutting head gaining improvements at every step.

A Google search revealed a patent listing that confirmed the problem of an audio dropout at around 8khz due to harmonic resonance introduced by the mechanical clamping of the tiny bearing between the arm and drive housing.
We eliminated the bearing all together, replacing it with a machined piece of flat aluminium clamped to the head between thin rubber shims.

Leave a Reply