Turntable speed accuracy

Halcro great to see you trying the thread drive. The pulley shape should be concave for thread drive so it self centres and does not ride up and down.
Dev I have been using my thread drive final audio Parthenon for over 20 yrs with silk thread , surgical silk, quite high tension and there is only a very faint mark on the platter, no wear.

Okay, I'm sure that I'm missing something hear as it relates to the Timeline. . .

Sutherland states that if your turntable is spinning at 33 1/3 RPM it will take 1.8 seconds to complete a revolution. His Timeline flashes at this 1.8 second interval, and if the revolutions are precise, the laser image will hit the same spot on the wall with every revolution. Makes complete sense.

However. . .33 1/3 RPM means that in one second (33 1/3 divided by 60 seconds/minute) your table will complete .5555 revolutions, or one revolution every 1.111 seconds, not 1.8 seconds.

What am I missing?

Regards, Catastrofe. Reverse your order of operation: 60/33.3 = 1.8.

Peace,

It's actually 1.80018... I think it's a repeating number. Let's hope Mr. Sutherland set his timing thus. Otherwise, the instrument is off by .00018 sec per revolution. Apparently this much error would drive some of us crazy or to a new turntable.

Catastrophe u missing .68 of a revolution - try 60 / 33.333333