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Old Yesterday, 09:47 AM   #3111
nocdplz is offline nocdplz
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Rough but correct, imho.
Rotating the vertical pivot axis instead, it will no longer be parallel to disc radius. On warps the point A will go higher than B. (attachment)
Simple mock up: take a rectangular cardboard and paste on it a stick, rotated. Now push up the stick and see what happens.

carlo
still not understanding...
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File Type: jpg long carrage LT 6.jpg (145.1 KB, 65 views)
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Old Yesterday, 05:40 PM   #3112
directdriver is offline directdriver  United States
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Carlo, sorry for the confusion in my wording. As I said the vertical pivot angle has to match the radius so, yes, they have to be parallel. What I meant was the counterweight and all the attachments have to be angled. Bottom line is that the two pivots have to have equal mass distribution. It's not that much different than conventional tonearm with offset angle headshell and offset angle bearing so the counterweight has to be angled accordingly. Again, the vertical bearings placement has to be in parallel with the radius.

(I am sticking to V-groove bearing or ball bearing. I can't see myself fiddling with rolling balls and their placements.)

Due to the high vertical mass and the need for swiveling base, I might scrap the whole idea. I would just build a parallel tracking with a diagonal tube, about 5 inches long, headshell on front end and back end (with no counterweight) is the carriage on two rods and they are attached to a pivot and counterweight. This is not that much different from most of the parallel arms here except the sliding area is next to the platter instead of hovering above it.
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Old Yesterday, 06:14 PM   #3113
directdriver is offline directdriver  United States
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Another rough drawing. Something like this.
Click the image to open in full size.
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Old Today, 06:14 AM   #3114
nocdplz is offline nocdplz
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Now i got it, thanks!
Evidently I have few neurons left, although I prefer to think that English is not my language.
I believe (learned with the Syrinx mK2 attempt) that your hypothesis is really difficult to achieve passively. There seems to be a progressive convergence on the innovative work of Ray and Ralf (and now the ideas of Koldby) on a sort of completely rethought semi-active LT. Maybe someone should open a new thread: it is strange to find so many infos on all kinds of TAs, and so little on servos.
carlo
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