57 years old grease


Like all mechanical devices, this turntable needs servicing. And it hasn't had any since it left the Black Forest.

I've taken the whole drive unit apart. Every part is going to get cleaned and every bit if old grease, gunk and oil will have to go.

I'm carefully checking what parts have been greased or oiled, because I should only apply new lubricants where needed.

Only one thing is worse than a badly greased turntable: one that has lube on parts that should be left clean.



I'm using two lubricants. A tube of automotive grease, SKF VKG 1/0.2 lithium, and fine white technical oil made by the Belgian company Vic Van Rompuy.

There are different opinions on the internets on what is the right product to lubricate these things.

For my own mental health, I'm ignoring the different powers that be, and I stick with these two products.



Once that's done, I can rebuild the drive mechanism and put it back in place. That's also a good time to start with the speed measurement mechanism.

I've built a prototype between the announcement of this contest and my selection (Make Speed Sensor from Scrap Parts and Sample the Motor Speed with Microcontroller).

I'm now going to make a proper fixture that can survive some shocks and abuse.

Photo 21-03-15 15 15 57.jpg


What you see on the bottom of this photo is an IR transmitter and receiver.

They are going to detect each rotation of the tapped pulley that you see in the upper right corner.

I've painted the bottom side of that pulley with a Sharpie. That part of the pulley will not reflect the IR beam.

In the middle of the photo you see a small mirror. That's going to be glued on the bottom of the pulley.

Only when that mirror is above the detector, the beam is reflected and we'll get a signal out of our IR receiver.

And that will happen just one time per rotation.


What's happening with the Arduino Kit?


I've given it to one of my kids. She's going to work through the workshops. She promised to take photos and videos along the way.

Here's the first activity: Button State Change Detection (Edge Detection)



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Make some room


I'll need some room in the cabinet to place the electronic parts.

For that, I've removed all possible components that will not be used in the enchanted version of the turntable.

I store them away safely, so that the Perpetuum can be restored in its original state at a later time.


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Side story: Perpetuum Ebner


The Black Forest has an age old reputation for making the best and the finest automatons. You can argue over the style (remember the cuckoo clock?). But you can't argue over skills and craftsmanship. They were the masters of the automaton.

That is also where the roots lie of our Perpetuum-Ebner.  At the turn of the previous century, a Mr. Christian Steidinger started a small workshop in St. Georgen im Schwarzwald. Like so many other entrepreneurs of that area, he started with crafting parts for clocks.  His brother Josef started his own workshop at the same time, in the same village. A few years later they joined forces and grounded a company together.

But the peace in the family wouldn't last long...



Table of Contents
Chapter 1: Fix the turntable
1: Perpetuum Ebner Musical 1
2: A Time to Kill and a Time to Heal
3: Preparation for Motor Drive
4: Motor control with Infineon Motor Shield and Arduino UNO
5: Turntable speed sample testbed with Arduino UNO
6: Turntable Speed Sensor design
7: Control Theory - End of Chapter 1
Chapter 2: First Enchantments
8: Digital Light Organ Enchantment
9: Autonomous Servo Lift
10: SMD Time - Solder the IR Speed Sensor PCB
11: Yelp - who can Help me to Compile and Run my First SAMA5D4 C Program
12: Son et Lumiere - End of Chapter 2
Chapter 3: Taming the Board
13: Breakthrough - Run my own C++ Program on the SAMA5D4
14: Digital Light Organ Input Buffer
15: SAMA5D4 Blinky
16: Scope Creep
17: Audio Sampling with 16-bit ADC ADS8343
18: Sending Files to SAMA5D4 over USB
19: Port my Light Organ from Arduino to SAMA5D4
20: Fast Fourier Transform on the SAMA5D4 - End of Chapter 3
Epilogue: Reaching for the Clouds
21: Right-Sizing my Plans
22: My Own C++ Buffered Sampler on the SAMA5D4
23: Building In the Motorized Light Organ
24: Up to the Clouds with Yún
25: Publish or Perish
26: Turntable Finished
Stretch & Boni
Bonus 1a: Remote Light Organ with WiFI pt. 1
Bonus 1b: Remote Light Organ with WiFI pt. 2
Grande Finale: Paho MQTT Client on the SAMA5D4
Related blog
Vintage Turntable repair: Can I fix a Perpetuum Ebner from 1958
Review 1: Atmel SMART SAMA5D4 Xplained Ultra Unboxing and First Steps
Review 2: Atmel SMART SAMA5D4 Xplained Ultra - Building the Libraries from Source
Review 3: Digital Continuous Rotation (360°) Servo Part 1
Review 4: Digital Continuous Rotation (360°) Servo Part 2
Review 5: Atmel SMART SAMA5D4 Xplained Ultra - TCP/IP running
Review 6: Atmel SMART SAMA5D4 Xplained Ultra - LINUX Distro with SSH support
Enchanted Objects: Let's work together to tame the ATMEL SMART SAMA5D4 Xplained Ultra kit
17 bis: Off South...
Review 7: Atmel SMART SAMA5D4 Xplained Ultra - C++ ADC Example on Linux
Review 8: Atmel SMART SAMA5D4 Xplained Ultra - Product Review
Review 9a: Atmel SMART SAMA5D4 Xplained Ultra - Set up ADC Buffer with Hardware Trigger Part 1
Review 9b: Atmel SMART SAMA5D4 Xplained Ultra - Set up ADC Buffer with Hardware Trigger Part 2
Review 10: Atmel SMART SAMA5D4 Xplained Ultra - New Content on AT91.com
1958 Turntable from the Black Forest - Summary of the Enchanted Player Story