The Secret Society of Lathe Trolls

Loudspeaker (Drive Coil)

The loudspeaker is used as a drive coil.
It is a BOSE 30 Watt loudspeaker from the "Sound-Dock" series.

Here some details to the magnets I used:

MAGNET‘s & WASHERS

I have a variety of different ring magnets and washers. This allows different scenarios to be carried out.

FEEDBACK COIL‘s OVERVIEW

I made Coil-2 (with different dimensions) in the same way.

Coil-3 and Coil-4 were created on a plastic spool carrier. Each spool carrier weighs 0.09 grams without the wire.
Coil-3 was spooled in the same way.
Coil-4 was spooled in other direction!

Coil-1 is ready and has a weight of 0.16 grams and a resistance of 10.4 ohms

At the end some glue

One more video

In the meantime I have built a winder using an Arduino and a stepper motor to ensure the number of turns.
Then I prepared everything for the wrapping process.
After winding, I glued the coil with nail polish.

Attached video: Winding process preparation
Attached video: Winding process

MY FEEDBACK COIL‘s Here I would like to introduce what I have already found out: How I made my test coils (feedback coils): Coil 1: First I disassembled an old speaker relay to get the coil wire. Then I made a spool carrier out of paper mache on a 3mm tube. Attached a short video that shows how i h...

I am an absolute beginner in the lathe field. I have little experience in electronics and no experience in construction of cutting heads. But I am very ambitious and have very good knowledge and good craftsmanship. My strongest trait is my perseverance and the will to solve all problems. I'm from Au...

have changed my mind and will now work with a feedback coil after all. I will present my progress in another post. - Thanks again for the suggestions.

It was my plan to measure the noise floor (without signal). I think that there should be as little background noise as possible here. The corresponding filters must be matched to this - I understand that. The information that the signal should then be at least 5-10 dB higher is very helpful. - Thank...

I understand. I hope to have enough mechanical damping in the head to reduce resonances. Also the volume and frequency of the pink noise I will see (hear) and analyse when the head is finished. Your informations and details are very helpfull for me and I want to thank you for it. When I have the fir...

Thank you for the quick and very helpful answer. So far your explanations are all clear to me. My filters are 4th order Butterworth which (hopefully) also have a steep curve. For the time being, I have not planned real de-essers (because I hope to get by with the low-pass filters). In my first proje...

As I am new to the forum, I would like to introduce myself briefly. I come from Austria (Vienna) and am 50+ years old; and vinyl fan for almost as long. ( My English is not very good, so I beg your indulgence). During the corona lockdown I had some time and started to work on the development of a re...