If I'm not wrong in calculating, 2um at 20 mm diameter pulley is 0.0001% or - 80db . that's acceptable
0.01% is 40db 🤔
6um over same 20mm diameter pulley should give 0.0003% or -70db, still perfect if it can be done in practice.
However, method I have chosen takes some time, than again I'm nt making series production but one off piece, so it is irrelevant cost - time wise.
6um over same 20mm diameter pulley should give 0.0003% or -70db, still perfect if it can be done in practice.
However, method I have chosen takes some time, than again I'm nt making series production but one off piece, so it is irrelevant cost - time wise.
Hi,
Last night I restarted my TT and have seen that paper strobe that I glued on the bottom of the platter slightly unglued on one spot, slightly touching optical sensor once every rotation.
I measured it like that by phone:
It is easy to see big change following exactly 1.3 second which is one turn for 45 rpm.
This phone app really gets things done , than I was wondering if there will be difference with stylus in groove and without it. If it is so sensitive it should capture stylus changes in friction too, This morning I removed paper strobe to free platter and this was set up:
As said, measured with stylus on record and without it, no changes to notice at all:
Last night I restarted my TT and have seen that paper strobe that I glued on the bottom of the platter slightly unglued on one spot, slightly touching optical sensor once every rotation.
I measured it like that by phone:
It is easy to see big change following exactly 1.3 second which is one turn for 45 rpm.
This phone app really gets things done , than I was wondering if there will be difference with stylus in groove and without it. If it is so sensitive it should capture stylus changes in friction too, This morning I removed paper strobe to free platter and this was set up:
As said, measured with stylus on record and without it, no changes to notice at all:
As conclusion, this App does all measurements that I need very sensitively. I can see even graph to analyze where any issue is coming from. A friend also used it on his TT, and results also there seem plausible.
Therefore I will stop playing with strobe and sensor, thing it is not worth it when this is easily available. Next will be test LP , with all variables included (LP, cart and arm).
Question; I'm thinking is it worth starting a thread to show benchmark of owners TT's by using this app? It is free to download and most people have better phone (with gyroscope), so it should be easy...
Therefore I will stop playing with strobe and sensor, thing it is not worth it when this is easily available. Next will be test LP , with all variables included (LP, cart and arm).
Question; I'm thinking is it worth starting a thread to show benchmark of owners TT's by using this app? It is free to download and most people have better phone (with gyroscope), so it should be easy...