Yes, there's enough of a slop room to compensate most record groove width even in a fixed pitch movement. But we also have to add in eccentricity. So the headshell rail width has to accommodate the widest groove gaps AND eccentricity. It's probably doable.
Utter waste of time to pay attention to any of your posts.
@directdriver "Utter waste of time to pay attention to any of your posts
That's a classic reply from someone who got told the truth about something.
And refuses/denies to accept said truth.
That's a classic reply from someone who got told the truth about something.
And refuses/denies to accept said truth.
I don't know what you are talking about! Are you saying that Thorens TD-124 must be used with the original tonearm only? No other tonearm should be used with Thorens TD-124 turntable. That is utter nonsense! You don't seem too wise to me.
@super10018
NO....
I never implied that a TD124 Must be used with any arm.
So stop jumping to conclusions and be reasonable.
Unlike what the OP is insisting, and clearly is not.
This is labeled as a DIY site, however SOME projects/dreams are WAY overboard and UNreasonable, if not utterly stupid and sensless.
NO....
I never implied that a TD124 Must be used with any arm.
So stop jumping to conclusions and be reasonable.
Unlike what the OP is insisting, and clearly is not.
This is labeled as a DIY site, however SOME projects/dreams are WAY overboard and UNreasonable, if not utterly stupid and sensless.
Another interesting project, Ralf, another step towards the solution of some of the many problems still present in every type of TA (at least for those able to see them).
And glad you joined us in the Radial TAs club (too few members, sadly). What I still haven't figured out is why, if the floating head shell can go half the way by itself, just by the SF, it couldn't do it always and completely. without any outer helping.
Couldn't a longer rail be enough?
ciao - carlo
And glad you joined us in the Radial TAs club (too few members, sadly). What I still haven't figured out is why, if the floating head shell can go half the way by itself, just by the SF, it couldn't do it always and completely. without any outer helping.
Couldn't a longer rail be enough?
ciao - carlo
Ralf really gets the cranky cranked up! When I think something is stupid I look elsewhere.
At DIYAudio it becomes a cause.
Saddle up Rocinante and engage with the enemy!!! Don Quixote rides again to protect the fragile minds of audio hobbyists from the evils of the, well, I am not quite sure but it sure must be scary.
At DIYAudio it becomes a cause.
Saddle up Rocinante and engage with the enemy!!! Don Quixote rides again to protect the fragile minds of audio hobbyists from the evils of the, well, I am not quite sure but it sure must be scary.
The one thing stepper motors cannot do is drive at constant speed (the name is a clue). And they are extremely noisy as motors go. No point worrying about bearing noise if there's a stepper in the equation, you are just going to be making an unwanted industrial soundscape, as far as I can reckon.
This is not my design. Let me quote Ralf's original post.
Personally, I don't like any kind of active tonearm.
Hi Carlo,
What my design tries to accomplish is, to create a linear tone arm that is compact and requires no more space to install than a conventional pivoting tone arm.
Take a look at one of the drawers in a modern office file cabinet. It rolls in and out, supported by a telescoping guide rail. The guide rail only moves half the distance that the drawer moves.
Sincerely,
Ralf
Hi Mark,
In 1984 or so, I designed and built my first tangentially tracking tone arm. It was servo controlled and used an Airpax stepping motor to drive its carriage.
I applied for US Patent specifically for the use of a stepping motor and the patent was granted! The motor was designed to take a 15 degree step approximately every 30 seconds. There was no bearing noise and the tone arm functioned just fine. I had it tested by "Take Five Audio" in New Haven Connecticut and it was listened to by audiophiles.
Your criticism is obviously not based on any experience you may or may not have.
Ralf
And my lowly mid-1980's Kenwood linear tracker moves the tonearm in such small increments, keeping itself tangental to the groove within 0.2 degrees in a slow, fluid, silent advancement.
I'm certainly quite satisfied!
I'm certainly quite satisfied!
Now it's clear Ralf, thanks.
Installing a linear on the normal seat of an usual 9" pivoted was also one of the goals of my Lil Casey, and even more of the CorkScrew FP, aiming above all to compactness. Certain monumental LTAs leave perplexed me too.
Another doubt is whether the uniform movement of the base, favoring just one direction, could not be problematic with eccentrics, a bit like a sloped rail. Have you already built it?
carlo
Installing a linear on the normal seat of an usual 9" pivoted was also one of the goals of my Lil Casey, and even more of the CorkScrew FP, aiming above all to compactness. Certain monumental LTAs leave perplexed me too.
Another doubt is whether the uniform movement of the base, favoring just one direction, could not be problematic with eccentrics, a bit like a sloped rail. Have you already built it?
carlo
..... tangental to the groove within 0.2 degrees in a slow, fluid, silent advancement.
I'm certainly quite satisfied! (wiseoldtech)
0.2° - seems really a good measure, practically undetectable at sight.
But for a normal LTA wand (around 170 mm, maybe) this equates to 0.6mm shift. This means that the stylus has to trace a dozen grooves (0.04 to 0.08mm) just trough a cantilever bending, up to 6°-
In short, I would be a bit less satisfied.
But consider please that with our diyed passive contraptions we have been struggling for years against bendings of <<1/10 due to a cart friction of less than 2mN - (corresponding to a > 10 times higher, on your active one).
carlo
Hoping my calcs are correct - you will find a lot of useful ones on the thread dedicated to our silly DIY LTAs dreams
Sorry for this digression, Ralph
I'm certainly quite satisfied! (wiseoldtech)
0.2° - seems really a good measure, practically undetectable at sight.
But for a normal LTA wand (around 170 mm, maybe) this equates to 0.6mm shift. This means that the stylus has to trace a dozen grooves (0.04 to 0.08mm) just trough a cantilever bending, up to 6°-
In short, I would be a bit less satisfied.
But consider please that with our diyed passive contraptions we have been struggling for years against bendings of <<1/10 due to a cart friction of less than 2mN - (corresponding to a > 10 times higher, on your active one).
carlo
Hoping my calcs are correct - you will find a lot of useful ones on the thread dedicated to our silly DIY LTAs dreams
Sorry for this digression, Ralph
@nocdplz
Consider this....
A fraction of a millimeter or a fraction of a degree of non-tangency while playing a record is really undetectable and trivial.
When the stylus cantilever itself is vibrating side-to-side, up and down, at more of an angle, particularly if a warp or non-centered record groove is its resting place.
Consider this....
A fraction of a millimeter or a fraction of a degree of non-tangency while playing a record is really undetectable and trivial.
When the stylus cantilever itself is vibrating side-to-side, up and down, at more of an angle, particularly if a warp or non-centered record groove is its resting place.
if you are happy...
The cantilever angle is only 1/2 arcsin 0.08 (the maximum width of a groove, if the cartridge is aligned across it) and this is the tonearm's job, in every conceivable condition- defect. With these topics we deal on these threads.
carlo
sorry again ralph
The cantilever angle is only 1/2 arcsin 0.08 (the maximum width of a groove, if the cartridge is aligned across it) and this is the tonearm's job, in every conceivable condition- defect. With these topics we deal on these threads.
carlo
sorry again ralph
There is no tone arm in the Universe, yours, mine or anyone else's that that can track "tangentially to the groove"
Ralf
https://www.diyaudio.com/community/threads/thoughts-on-tracking-tangentially-to-the-groove.379848/
Done to death years ago and nitpicked as well.
Done to death years ago and nitpicked as well.