DIY Schroeder Tonearm???

[ticovski]

Can anyone be kind and explain to me how is regulated antiskating on Schroeder design

Thank you,
Ticovski

[mgreene]

It appears that the twist in the thread applies the antiskating.

If you look at the materials on the Shroeder website, in the owner instructions, he shows how the curled knob at the top of the arm pillar, which captures the string, has an inner hex screw. The inner screw appears to set the spacing between the magnets and larger kurled screw applies twist to the monofilament line applying antiskating.

Or at least that's how it looks

Mike

[ticovski]

Thank you, think that now understand :-)

Another (two) questions:
How to calculate effective mass of tonearm, any formula;
and how much of the force do we need in between magnets (5, 10, 15... kg)

Regards,
Ticovski

[Paul Ebert]

Originally posted by ticovski
Another (two) questions:
How to calculate effective mass of tonearm, any formula;
and how much of the force do we need in between magnets (5, 10, 15... kg)

I don't know how to calculate effective mass. My plan for my DIY arm is to 'reverse engineer' it empirically by using the HiFi News and Record Review test record to determine the resonance and, then, calculate the effective mass based on that. But, this is an after-the-fact approach and I haven't performed it yet. Based on my experiences (BTW, my arm is very different - it's a linear air-bearing arm), I got very lucky.

Regarding magnetic field strength, I would think that the stronger the better would apply (as long as the string could handle it, of course).

Paul Ebert

[peterr]

How to calculate effective mass of tonearm

I asked the same question some time ago and got a very thorough reply from Dice45 and Jeremy Epstein:effective mass
At the time I made an excel-sheet to do the calculations but I am afraid to have lost it . Sorry.

[mgreene]

I had pretty much planned to do as the same as Paul and just take a shot in the dark - but the question did cross my mind. I figured that if I looked hard enough on the web, and in my old references I could probably find something on the subject of tonearm mass.

In any case, the carbon fiber set-up looks like the least amount of work and will thus result in the least amount of dissapointment if it doesn't work out

I figured the wood arms could come later.

Mike

[ticovski]

Thank you for the link Peter,
I read reffering postings a few times and have some understanding about effective mass now, but don`t understand what is final formula. If you accidentally find your excel sheet I would appreciate if you would send me a copy. Otherwise I don`t see how to do calcs. I like to know what I am doing.

Thank you,
Ticovski

[hifidaddy]

Originally posted by Paul Ebert


Regarding magnetic field strength, I would think that the stronger the better would apply (as long as the string could handle it, of course).

Hi Paul,

I have a Schroeder No.1 tonearm (even wrote the test report for http://www.tnt-audio.com), and can tell you that the magnets of the Schroeder tonearm have about 10kgs attracting force.

regards,
Hartmut from Munich

[konstantin]

Here are some pics of my DIY Turntables and Schroeder tonearm clone. I'll post some more detail pics as soon as i get my digital camera back (Did you heard that Chris?).
Meanwhile, anyone want details of the cosntruction feel free to mail me.

Regards
Konstantin

ktzivleris@hotmail.com[IMG]http://[/IMG]

[konstantin]

Another one