Turntable speed accuracy

Atmasphere - think of all the "wear and tear" of all the drive train over 70 odd years. I think whilst we have gained in technology, we have probably lost ground in metallurgy, it's the age of junk metals ( PC & non toxic manufacturing processes required ). I still marvel at the lack of main bearing wear in the Final TT which is now over 30 years old.
Love to hear playback via a lathe and good old Mcintosh MI200's that I lusted after years ago.

Lewm - distance from wall is 400mm if you want to do the maths.

Henry - just to say thanks for the inspiration - your video challenge has really upped the game for die hard analogue folk.

Dear Dover, I don't. But I am surprised you were even able to perceive (visually) a 2-mm displacement, although I guess over time you could measure a larger distance and then extrapolate backwards to determine 2mm per revolution.

Lewm - I positioned vertically a silver metal marker, about 25mm wide, on the wall - it was quite easy to check the moving distance from the leading edge.

Dover, it has been sitting for some decades, I suspect.

The trust bearings are interesting. They are a set of polished platforms that reside beneath the platter. The drive shaft comes through the center and has nothing to do with them!

I almost bought the timeline. Glad I didn't. using a Fluke digital multimeter is a more accurate way to set your speed, rather than trying to look at a laser being somewhat stationary on a wall. Use a test record at 1000Hz and connecting the Fluke to the output of the phono stage. For 45 rpm, the same 1000 Hz tone should read 1.35k Hz. The Fluke cost about $125.00.