@halcro
Thread Drive
The problem with most turntable motors is that the motors are not designed to withstand side loads imparted by the belt. With some manufacturers they get the motors modded by adding roller bearings to support the motor spindle. Thats why they go noisy over time.
Thread drive presents higher loads than rubber belts, so you need a motor that is much stronger. The motor in the Final uses a large diamoeter spindle, sintered bushings top and bottom, and a thrust pad similar to a TT.
Also the pulley needs to be concave for thread drive.
Notwithstanding that obvoiusly the Raven AC is one of the better belt drives out there. Have you looked at the possibility of upgrading the platter ( 10kg ) to the Anniversary platter ( 20kg ).
According to Brinkmann they believe that magic number for enough mass is 15kg and if the bearing is up to it I would expect the Anniversary platter to be a good upgrade, particlualry in terms of stability.
Thread Drive
I actually tried a number of 'approved threads' sent to me by Dertonearm for driving the Raven AC-2 as an alternative to the rubber belt.
Unfortunately....none of them could regulate the platter speed correctly due to the Raven's design of requiring the 'rough' side of the rubber belt to 'grip' the Delrin edge of the platter.
The problem with most turntable motors is that the motors are not designed to withstand side loads imparted by the belt. With some manufacturers they get the motors modded by adding roller bearings to support the motor spindle. Thats why they go noisy over time.
Thread drive presents higher loads than rubber belts, so you need a motor that is much stronger. The motor in the Final uses a large diamoeter spindle, sintered bushings top and bottom, and a thrust pad similar to a TT.
Also the pulley needs to be concave for thread drive.
And yet you thought the 'rubber' Belt-Drive turntable was a DIRECT-DRIVE in the above test...🤔Yes, I'm going to drown my sorrows with a very good Central Otrago Pinot Noir tonight.
Notwithstanding that obvoiusly the Raven AC is one of the better belt drives out there. Have you looked at the possibility of upgrading the platter ( 10kg ) to the Anniversary platter ( 20kg ).
According to Brinkmann they believe that magic number for enough mass is 15kg and if the bearing is up to it I would expect the Anniversary platter to be a good upgrade, particlualry in terms of stability.