TomicTime Posted January 4, 2023 Share Posted January 4, 2023 2 hours ago, Holmz said: Maybe I’ll take a crack at it… i good place to start would IMO be asking the maker of your arm….. i believe from my limited understanding of his philosophy tangency distortion takes a distant back seat to cartridge / arm mass and compliance compatibility….. Link to comment Share on other sites More sharing options...
Holmz Posted January 4, 2023 Share Posted January 4, 2023 3 hours ago, TomicTime said: i good place to start would IMO be asking the maker of your arm….. i believe from my limited understanding of his philosophy tangency distortion takes a distant back seat to cartridge / arm mass and compliance compatibility….. Yeah Jim - I think you are correct. But it is a bit of a three body problem, so when the arm and cart appear possessed and in need an exorcist… then it is motorcrossing around the vinyl. I was making referring to the math part of the arms. I am not so sure that the alignment stuff is as critical as people make out… Clearly the spindal distance and overhand effective length seems like a bit of a time waster as one can use beyerwald, and other schemes which change the effective length. So if the spindle to pivot was off by 1-mm then that is less than the difference between a lot of those alignments. So instead of being perfect at the null point, then it is perfect somewhere else. I am sure my distance is <0.25mm, as it is as close to “spot on” as I can see without a large vernier calliper. Once we get to SRA, Azimuth it gets more critical… People also get into a bit decimal place fetishism about tracking force, and maybe it matters more than I think… but 0,05 to 0.1 gm seems like it might be good enough. At least a few people also make a big deal about bearings and friction/stiction and knife edge chatter. The Korf site is pretty good, and goes nicely into the resonance stuff @GdnrBob and a lot of that is wound up in the Korf blogs. In any case I was more interested in the geometry and math, and how the longer affects things, which I think is way less than than cart comparability and resonance. 1 Link to comment Share on other sites More sharing options...
TomicTime Posted January 4, 2023 Share Posted January 4, 2023 you might like to visit three particular sites that i have found useful as it is not just a pure math tradeoff problem but also a lack of standards ( cutter head angle ) and manufacturing tolerance issue….. into the realm of…. statistics… ( yes…i am one of those Six Sigma Black Belt dudes….amidst other black arts )…. For example Lyra supplier spec ( probably BEST in world ) for stylus in cantilever alignment is +/- 1.5 degree…… now ponder a vendor with lower hurdle…… Besides Richard, i trust : J Carr at Lyra Thom at Galiber Design ( excellent blog ) Analog Magik JR at WAM engineering…aka Wally Tools there are others for sure…. 2 Link to comment Share on other sites More sharing options...
Holmz Posted January 4, 2023 Share Posted January 4, 2023 Thanks Jim. Thom is one of the fellows that I got some help from last year. And he recommended the used CB-9. Everyone likes a dragon killer, but the old SOTA was sounding pretty good, so it should be fine with the new motor, bearing, arm and cart. Certainly good enough for a Luddite, 1 Link to comment Share on other sites More sharing options...
TomicTime Posted January 5, 2023 Share Posted January 5, 2023 i would think so 😉 3 Link to comment Share on other sites More sharing options...
TomicTime Posted January 9, 2023 Share Posted January 9, 2023 more fun stuff….. w Signet TK-9ea and Dynavector DV-505….. 4 Link to comment Share on other sites More sharing options...
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