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Old 17th July 2018, 03:48 PM   #1871
2wice is offline 2wice  South Africa
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Forgot the pic.
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Old 17th July 2018, 07:54 PM   #1872
dtut is offline dtut  United States
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2wice,

You've got my attention. Two cams? Sure would like to see a plan view.
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Old 17th July 2018, 08:21 PM   #1873
2wice is offline 2wice  South Africa
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Quote:
Originally Posted by dtut View Post
2wice,

You've got my attention. Two cams? Sure would like to see a plan view.
I'm not yet ready to share the internals publicly as it was a lot harder than I thought, but if you PM me your email I can send you a look.
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Old 19th July 2018, 05:35 AM   #1874
nocdplz is offline nocdplz
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Which one do you prefer, the belt driven or the one with the parallel* bars? Vincent
... the next i'll build: always trying to experiment, not to make the $$uper-reference-definitive arm at home.

There is only 1 NULL point, and it is everywhere.
Welcome back, 2wice. and with such a sophisticated solution (geometry and mechanics) - eager to understand how it works

carlo
* no. not parallel: it took a lot of work of Doug, 2wice and me to find the best levers ratio (measures on the linkage file)

Last edited by nocdplz; 19th July 2018 at 05:43 AM.
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Old 19th July 2018, 07:22 AM   #1875
2wice is offline 2wice  South Africa
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Quote:
Originally Posted by nocdplz View Post
Welcome back, 2wice. and with such a sophisticated solution (geometry and mechanics) - eager to understand how it works
Thanks, I will share once I know it works for sure.
There is still an eccentric issue, if I can counter the drag force somehow that "problem" will disappear. It can be done with a counterweight but that just seems a bit clunky and approximate.

Last edited by 2wice; 19th July 2018 at 07:46 AM.
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Old Yesterday, 05:28 PM   #1876
dtut is offline dtut  United States
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2wice,

PM sent.

Does anybody have any suggestions about how us poor Mac users can open the 3DTOY printing files?
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Old Yesterday, 08:34 PM   #1877
david_reis is offline david_reis  United States
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Doug, are you just looking to open them for viewing? Or do you want to edit them to add features/change dimensions? If you just wish to view the STL files you might try Pleasant3D or GLC-Player. I haven't used them, but they're both free.
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Old Today, 03:42 AM   #1878
Straight Tracker is offline Straight Tracker  United States
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Default Your question intrigued me

Quote:
Originally Posted by midrange View Post
Has a "reduced" tracking error tonearm ever been tried?

What I am thinking of, is using the average time for a side of a record, and moving the arm base across at a steady rate to keep the arm on average approximately tangential. It would be fairly easy to achieve, and could be done with reasonable structural integrity.
Hello midrange,

You made me curious, so I made some CAD drawings to find out just how much tracking error there would be.

The minimum and the maximum groove pitches are .002" and .010" respectively. I assumed a lead screw pitch of .006" (the average) rotating at the same RPM as the LP to keep the math simple.

Drawing 1 shows a tracking error of + and - 12.425 Degrees on an LP having all grooves at the .002" pitch.

Drawing 2 shows a tracking error of + and - 12.426 Degrees on an LP having all grooves at the .010" pitch.

Now, if you had an LP with alternating .002" and .010" pitch grooves, you would have no tracking error.

Depending upon what combination of groove pitches a particular LP may have, you would get unpredictable tracking errors between 0 Degrees and 12.425 Degrees.

Sincerely,

Ralf
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