The Secret Society of Lathe Trolls

https://www.lathetrolls.com/viewtopic.php?f=8&t=7791&p=50278#p50278
Here it is....
BTW, Mark, great work!

...and a wacky early stereo version...
...more to come....

The book(wich I dont own) "The design of a cutter head for the amateur" was based in the following papers...

...ans specific about how the head worked...

Hi,
I came across some docs that may be of interest.

First, the Phillips Miller recorder recorded mechanically on film to be read optically. The cutter head was moving iron, of course.

The BBC did great job adapting the Phillips miller cutter to disc recording.
Here's a patent from these egineers from the Netherlands.When find time, I'll upload some articles written by them about moving iron cutters...

Usually is mild steel, the most common used in household hardware...
I strongly reccomend you to read all you can about how a moving iron cuttter works and magnetism.The book in the link above is a good start... and search this forum for more.

The socket you are talking about is called "armature" and I'll be surprised if you find it made anywhere. Only option is to make one yourself or ask a machinist to make one. For that you may need to know the exact dimensions... some trial and error is to be expected, it will take some time About the...

Oh! I realize now the stepper is for spinnig the turntable, sorry,

Hey, good luck with your project! You have to choose the turntable with the highest possible torque, search forum for options, Is said that certain models from Technics and Stanton may work,but also sone very old turntables. I think the backplate cn be made of alluminum, brass or other non magnetic ...

http://www.bbc.co.uk/rd/publications/rdreport_1943_11
This wasfor phillips-miller stylii

Hello,
Hey, nice project! So the main resonance is 12k? Thats way too much for a moving coil... are you sure that the search coil picks up only the motion or also the field emmited by the drive? If it makes no damage, try to stop the motion and measure what happens...

I found out that not all x-ray sheets are the same. Some have a thin film on it, like laserdiscs. Some thicker. What works with ones dont apply to others.
also they are easily spoiled if not treated very carefully.
If you have a lot, try to separate different kinds, before getting mad!

Thanks for your answer,Peter,
The ratchet was filed with epoxi! But managed to open it with no damage to other parts.
Here's a pic if somebody wonders how it looks like:

Hello Trolls,
I'm trying to repair the ratchet of a 6n. I unscrew rhe 3 screws that hold it toghether( are they?) But the thing dont seem to open...Can it be opened? Any ideas about how to do it are welcome...before I get mad with the torch and hammer!☺
Thanks for reading.

Well, the idlers are old indeed...the plastic tubing carved with a blade while spinnng gave not bad results to me.Maybe a metal sleeve can be done the same way. But of course, a proffesional machinist is the best option.

The pics in my post above are gone, so i shooted another.It still working fine after some years... The 100v came from a multitap transformer that was very comon in the midle of last century for regulating the power supply in television sets, as voltage from main varyed wildly form differnt locations...

The 100v came from a multitap transformer that was very comon in the midle of last century for regulating the power supply in television sets, as voltage from main varyed wildly form differnt locations. The sleeve is made of plastic pipe, heated to fit, not rubber. Dont know why is less noisy this w...

I solved this prblem this way(see link), and the lathe still runing fine.At first I used a 220-125v transforme(and more than 10 hours non stopr, later I changed to a 220-100v to keep the hz/volts ratio(more or less) butmaybe this was not importsnt https://www.lathetrolls.com/viewtopic.php?f=1&t=4635...

15 seconds!


https://youtu.be/j0EOLmj36oQ