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Old 11th May 2021, 04:55 PM   #4471
nocdplz is offline nocdplz
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Great Karsten: it looks beautiful even next to the legendary SME, as in the video.
Seeing the family of radials expand and enrich with new, valid, ideas is something that fills me with satisfaction.
You have managed to make a radial arm even simpler than the LC (obviously automatic lifter excluded, a demonstration of mastery and competence) and with remarkable tracking behavior.
A new, broader road open to experimentations

carlo
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Old 11th May 2021, 05:13 PM   #4472
Mike56 is offline Mike56
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Quote:
Originally Posted by koldby View Post
Hello Thread!
Here is my take on a linear tracker. Very much inspired by the Great Calo and his work with Lil Casey.
The tube and carrier is stolen directly from that design, but I decided to make a short arm and a knife edge bearing as the vertical bearing.
Still need some finishing and I havenīt decided what to do with the green LED and if I need it at all.
Here is a link to two videos, 1 showing how it operates and 2 a close-up on the cartridge showing very little bending of the cantilever, indicating, to me at least, not too much friction:
Dropbox - Linear Tracker - Simplify your life

Enjoy
Hey Karsten,
Looking great, i love the function of the lift and the general simple execution.
I look forward to hearing that it sounds as good as it looks.
It also shows how many different ways there are to approach LTA.
The electronics are all way out of my league but i hope to post further progress on the old mechanical thing soon!
Congrats
Mike
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PC, to Chordette GEM DAC or O.L. Aurora 4 with Home built Radial LTA or OL Onyx arm Rega Ania to Graham Slee MC pre, to Prima Luna Prologue 1. Troels Gravesen Fusion BAD with Hypex 151's high level input
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Old 11th May 2021, 07:13 PM   #4473
2A3SET is offline 2A3SET  Canada
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Location: Toronto
Quote:
Originally Posted by koldby View Post
Hello Thread!
Here is my take on a linear tracker. Very much inspired by the Great Calo and his work with Lil Casey.
The tube and carrier is stolen directly from that design, but I decided to make a short arm and a knife edge bearing as the vertical bearing.
Still need some finishing and I havenīt decided what to do with the green LED and if I need it at all.
Here is a link to two videos, 1 showing how it operates and 2 a close-up on the cartridge showing very little bending of the cantilever, indicating, to me at least, not too much friction:
Dropbox - Linear Tracker - Simplify your life

Enjoy
Congratulations Karsten!
This looks super, I can not see much needle drag probably due the light weight of the carriage.
Is that a Lenco?

Cheers!
Wei

Last edited by 2A3SET; 11th May 2021 at 07:18 PM.
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Old 11th May 2021, 11:33 PM   #4474
super10018 is offline super10018  United States
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Hi Karsten,

Very nice! I especially like the lifting and retrieve mechanism.

But it seems to me that you used a regular LP to test stylus drag. When I did my test, I expanded the center hole of a test LP a little over 2 mm. Then, I placed the test LP off-center and played back the 1KHz track on the test LP. A regular LP should be ok as well. 2 mm of eccentricity is probably a bit too extreme. If the cartridge can pass 2 mm eccentric torture, you should be ok in most cases.

Anyway, great job!

Jim
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Old 12th May 2021, 08:09 AM   #4475
koldby is offline koldby  Denmark
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Quote:
Originally Posted by 2A3SET View Post
Congratulations Karsten!
This looks super, I can not see much needle drag probably due the light weight of the carriage.
Is that a Lenco?

Cheers!
Wei
Thanks!
Yes the light weight and the fact that the rail is directly over the carriage.
Yes that is a Lenco with a tachometer speed control.
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Old 12th May 2021, 08:16 AM   #4476
koldby is offline koldby  Denmark
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Quote:
Originally Posted by super10018 View Post
Hi Karsten,

Very nice! I especially like the lifting and retrieve mechanism.

But it seems to me that you used a regular LP to test stylus drag. When I did my test, I expanded the center hole of a test LP a little over 2 mm. Then, I placed the test LP off-center and played back the 1KHz track on the test LP. A regular LP should be ok as well. 2 mm of eccentricity is probably a bit too extreme. If the cartridge can pass 2 mm eccentric torture, you should be ok in most cases.

Anyway, great job!

Jim
Thanks Jim!
I know that in order to torture test the arm, a record with higher eccentricity will show it more clearly. Still I think you can see that there are no abrupt movement of the cantilever, when it tracks a normal record. I have made a couple of Linear Trackers before this and non of them passed the close-up test on that record. You could easily see the cantilever bending before the carriage moved.
Still I should probably find or make a record with more eccentricity , just to test it. I have no intention to listen to a record with 2 mm eccentricity, though
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Old 12th May 2021, 08:20 AM   #4477
koldby is offline koldby  Denmark
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Quote:
Originally Posted by nocdplz View Post
Great Karsten: it looks beautiful even next to the legendary SME, as in the video.
Seeing the family of radials expand and enrich with new, valid, ideas is something that fills me with satisfaction.
You have managed to make a radial arm even simpler than the LC (obviously automatic lifter excluded, a demonstration of mastery and competence) and with remarkable tracking behavior.
A new, broader road open to experimentations

carlo
Hi Carlo.
I am flattered by you kind remarks, but you are too kind.
I know my skills in the workshop is lacking, especially compared with your works of art!
The goal was to make a simple linear tracker, and it is , conceptually, but it turned out to be not that simple after all. Wow there are many parts in that design.
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Old 12th May 2021, 08:29 AM   #4478
koldby is offline koldby  Denmark
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Quote:
Originally Posted by Mike56 View Post
Hey Karsten,
Looking great, i love the function of the lift and the general simple execution.
I look forward to hearing that it sounds as good as it looks.
It also shows how many different ways there are to approach LTA.
The electronics are all way out of my league but i hope to post further progress on the old mechanical thing soon!
Congrats
Mike
Thanks Mike.
Many ways to do that, yes. And you have indeed shown a lot of new ways to do it. It is a fun and interesting journey, although frustrating from time to time, as you are well aware of.
Keep them coming!
It was my intention to make a simple arm that worked, before I made an attempt on the arm I really dreamed to make, but it took far more time an effort than I had ever imagined. So it will probably be a while before I start all over again on the dream arm (hint : passive linear tracking with some help )
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Old 14th May 2021, 07:12 PM   #4479
2A3SET is offline 2A3SET  Canada
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Default stability issue

Working on the LC prism (Thanks Carlo for sharing the design).
Ortofon vms works well but not with this Z1, wondering how can I get it balanced (the stylus should be aligned well with carriage)

Video with Z1

BTW, any tips to attach animated GIF?

Last edited by 2A3SET; 14th May 2021 at 07:18 PM.
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Old 15th May 2021, 06:48 AM   #4480
Mike56 is offline Mike56
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Quote:
Originally Posted by Mike56 View Post

My Pen tip paralelogram is now working in orientation parallel to the rails as a prototype.
It uses an X section rail and so far is all OK, picture and first measures attached.
................ my expectation is there will be more potential unless i have learnt enough to go straight in at the top of the curve, which i doubt very much!
It seems i had learnt very little, the X rail has gone away for now as i couldn't get tracking as good as before, it played records but was not the progress that i hoped for. I am using a previous rail now, Inverted V over V, i will refine the new paralelogram and see if it is worth keeping. then i will have a look back at rails again.
I am still not sure whether the paralelogram orientation is happier parallel to the groove or along the arm?
M
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File Type: jpg WIN_20210514_17_15_37_Pro.jpg (538.8 KB, 144 views)
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PC, to Chordette GEM DAC or O.L. Aurora 4 with Home built Radial LTA or OL Onyx arm Rega Ania to Graham Slee MC pre, to Prima Luna Prologue 1. Troels Gravesen Fusion BAD with Hypex 151's high level input
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