# Ep082: DJ CNC, NFC Black Box, Sound of Keys, and Payin' for 3D Prints

- Show: [Hackaday Podcast](https://hardwarepodcasts.com/podcast/hackaday-podcast)
- Published: 2020-08-28
- Length: 57m
- Page: https://hardwarepodcasts.com/podcast/hackaday-podcast/2020-08-28-ep082-dj-cnc-nfc-black-box-sound-of-keys-and-payin-for-3d-prints
- Listen: https://hackaday.libsyn.com/ep082-dj-cnc-nfc-black-box-sound-of-keys-and-payin-for-3d-prints

## Summary

Hackaday editors Mike Szczys and Elliot Williams review several hardware hacks, including Paul McClay's DJ CNC, which repurposes CD-ROM stepper motors and a Dremel to mill acrylic by mounting the tool horizontally. They also discuss a security research project by Sundaria, Ramesh, Harini, Ramprasad, and Jun Han that reverse-engineers house keys from the sound of pins clicking in a lock, and Christopher Wade's DEF CON talk on breaking proprietary NFC firmware in smartphones. Finally, they highlight a cardboard RC car built by the Kryser channel and a starburst display by mangy dog using laser-cut acrylic and UV resin.

## Chapters

- [0:01](https://hardwarepodcasts.com/podcast/hackaday-podcast/2020-08-28-ep082-dj-cnc-nfc-black-box-sound-of-keys-and-payin-for-3d-prints#t=1) Introduction: Hackaday Podcast Ep082
- [2:34](https://hardwarepodcasts.com/podcast/hackaday-podcast/2020-08-28-ep082-dj-cnc-nfc-black-box-sound-of-keys-and-payin-for-3d-prints#t=154) Paul McClay's DJ CNC: Repurposing CD Drives and Dremels
- [9:28](https://hardwarepodcasts.com/podcast/hackaday-podcast/2020-08-28-ep082-dj-cnc-nfc-black-box-sound-of-keys-and-payin-for-3d-prints#t=568) Russell Graves' Off-Grid Office Shed
- [14:09](https://hardwarepodcasts.com/podcast/hackaday-podcast/2020-08-28-ep082-dj-cnc-nfc-black-box-sound-of-keys-and-payin-for-3d-prints#t=849) Sound of Keys: Reverse Engineering Locks via Audio
- [22:00](https://hardwarepodcasts.com/podcast/hackaday-podcast/2020-08-28-ep082-dj-cnc-nfc-black-box-sound-of-keys-and-payin-for-3d-prints#t=1320) Kryser's Cardboard RC Car and Braking System
- [26:46](https://hardwarepodcasts.com/podcast/hackaday-podcast/2020-08-28-ep082-dj-cnc-nfc-black-box-sound-of-keys-and-payin-for-3d-prints#t=1606) Christopher Wade's NFC Black Box and Firmware Hacking
- [32:50](https://hardwarepodcasts.com/podcast/hackaday-podcast/2020-08-28-ep082-dj-cnc-nfc-black-box-sound-of-keys-and-payin-for-3d-prints#t=1970) Mangy Dog's Starburst Display and UV Resin Diffusers
- [36:21](https://hardwarepodcasts.com/podcast/hackaday-podcast/2020-08-28-ep082-dj-cnc-nfc-black-box-sound-of-keys-and-payin-for-3d-prints#t=2181) Quick Hacks: JPEG Deck, Circle Guitar, and Art Projects
- [40:56](https://hardwarepodcasts.com/podcast/hackaday-podcast/2020-08-28-ep082-dj-cnc-nfc-black-box-sound-of-keys-and-payin-for-3d-prints#t=2456) Donald Papp's Article on Paid 3D Printing Models
- [48:14](https://hardwarepodcasts.com/podcast/hackaday-podcast/2020-08-28-ep082-dj-cnc-nfc-black-box-sound-of-keys-and-payin-for-3d-prints#t=2894) Damage to the Arecibo Observatory

## Topics

- [Mechanical engineering](https://hardwarepodcasts.com/topic/mechanical-engineering)
- [Security & privacy](https://hardwarepodcasts.com/topic/security-and-privacy)
- [Embedded firmware](https://hardwarepodcasts.com/topic/embedded-firmware)
- [Materials & manufacturing processes](https://hardwarepodcasts.com/topic/materials-and-processes)
- [Industrial & consumer product design](https://hardwarepodcasts.com/topic/industrial-design)
- [Sourcing & supply chain](https://hardwarepodcasts.com/topic/sourcing-and-supply-chain)

## Most relevant to

makers and hobbyists

## Mentioned

- Hackaday (company)
- Paul McClay (other)
- CD-ROM (other)
- Dremel (product)
- Sundaria (other)
- Ramesh (other)
- Harini (other)
- Ramprasad (other)
- Jun Han (other)
- Kryser (other)
- Christopher Wade (other)
- DEF CON (other)
- NFC (other)
- Samsung (company)
- Mangy Dog (other)
- Larry Bank (other)
- JPEG Deck (product)
- Anthony Dickens (other)
- Dris Deporter (other)
- Donald Papp (other)
- Thingiverse (other)
- Arecibo Observatory (other)

## Related episodes from other shows

- [049 - Reversing Your Childhood One Game At a Time](https://hardwarepodcasts.com/podcast/unnamed-reverse-engineering-podcast/2021-07-11-049-reversing-your-childhood-one-game-at-a-time) (Unnamed Reverse Engineering Podcast)
- [071 - Snerd Niped](https://hardwarepodcasts.com/podcast/unnamed-reverse-engineering-podcast/2024-09-07-071-snerd-niped) (Unnamed Reverse Engineering Podcast)
- [074 - This Coconut Won't Open](https://hardwarepodcasts.com/podcast/unnamed-reverse-engineering-podcast/2025-05-06-074-this-coconut-wont-open) (Unnamed Reverse Engineering Podcast)
- [An Interview with Samy Kamkar](https://hardwarepodcasts.com/podcast/the-amp-hour/2016-07-22-an-interview-with-samy-kamkar) (The Amp Hour)
- [058 - Technically Met the Specs](https://hardwarepodcasts.com/podcast/unnamed-reverse-engineering-podcast/2022-06-15-058-technically-met-the-specs) (Unnamed Reverse Engineering Podcast)

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