FOR REFERENCE: RARE Thorens lathe, WWII

[blacknwhite]

FOR REFERENCE: RARE Thorens lathe, WWII - heard of it but never seen one before - cool!:



















- Bob

[mossboss]

Hey Bob
This is a real good collection of photos Great
Interesting t/t motor by the way
It looks like an AC motor with permanent magnets on the rotor having flat ovoid windings on the stator
Its large diameter provides for very good flywheel effect for stability
This technology is used on hard disc drives as well as floppy disk drives today very low profile motors with extreme stability
There can be any amount of poles so an 8 or 12 even a 16 pole motor that synchronises on the mains frequency makes them very stable
Any frequency variation in the mains is divided out by the number of poles used
It seems that they had a variable speed friction like a sliding cone arrangement so as to get the various speeds
I guess the T/T was driven with a friction wheel
The strobe light I supose is the speed indicator
Since it is a variable friction drive it wouldnt care so mach about mains frequency so 60Hz or 50 Hz mains would not be an issue
Smart
Swiss chocolate like very tasty
Cheers

[blacknwhite]

HA, yes, I was most fascinated by the motor too!

And, the way they used universal joints & shafting to put the handwheel for lead-in & lead-out grooves at the FRONT of the table... (although it probably just added more clunking on lead-in/out, but I'm sure they threw in another rubber isolation joint there... and back in the 78 era, Who Cared about that level of noise)

- Bob

[mossboss]

Hey Bob
It was not unusual to beat out the led in and out groves and cut a new one on the masters prior to making mothers, with a scriber on a simple jig
They where copper so not a hard thing to do
The lathe operators cutting on wax around the 2 inches thick where not really concerned with that bit
It was a common practice in Europe as well as the UK
I am not sure about USA plants but I would not be surprised at all if it was applied there as well
Noise on 78's?
No way
Some of them sounded like Chip and Dale after harvesting a whole heap of nuts for the winter Or was the cut that it was Hill and Dale
Not sure
Any one on this?
Cheers

[Simon]

This is on ebay at this time.

I have been in contact with the seller.

Possibly fixed pitch like the Presto - he is not sure.

78 and 33 rpm

I have seen another one of these here in the UK.

I think they sold them to most countries in Europe, - I actual think it is a bit later than WWII.

[flozki]

got one of those.
i like the compact design...
its fixed pitch. with kind of a gearbox to change feedscrew speed.
first ones where made around 40ies...until 50ies..
was not that rare.. was made for swiss broadcast statiosn. so there must be
many more at collectors places....
mine is not in that good shape.
great pictures.

the motor is synchronous motor...

f.

[record cutter 76]

i would like to buy one of thease is that some one out ther how whant to sell me one