DIY Schroeder Tonearm??? - diyAudio
Go Back   Home > Forums > Source & Line > Analogue Source

Analogue Source Turntables, Tonearms, Cartridges, Phono Stages, Tuners, Tape Recorders, etc.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 4th April 2003, 08:12 PM   #1
mgreene is offline mgreene  United States
diyAudio Member
 
Join Date: Jun 2002
Location: Aiken, South Carolina USA
Default DIY Schroeder Tonearm???

With all the recent talk about unipivots and such, has no one ever considered knocking off a magnet stabilized string pivot like the Schroeder? I have been considering a DIY arm just to add a mono cartridge to my TT. This implementation "looks" fairly simple Assuming you have a source of wood and carbon fibre, the only things slightly out of the ordinary are the neodium magnets, which are fairly ubiquitous on the web.

See pics and a review of the Schroeder's stuff at his website: http://www.schroeder-tonarme.de/

Mike
  Reply With Quote
Old 5th April 2003, 07:23 AM   #2
diyAudio Member
 
Brett's Avatar
 
Join Date: Jan 2002
Default Re: DIY Schroeder Tonearm???

Quote:
Originally posted by mgreene
With all the recent talk about unipivots and such, has no one ever considered knocking off a magnet stabilized string pivot like the Schroeder? I have been considering a DIY arm just to add a mono cartridge to my TT. This implementation "looks" fairly simple Assuming you have a source of wood and carbon fibre, the only things slightly out of the ordinary are the neodium magnets, which are fairly ubiquitous on the web.
I've thought about this too. It does look straightforward, and I have a spare tonearm mount on one of my TT's....
I'd try a carbonfibre arrowshaft as the tube.

I have a couple of other projects to finish first, but I'm very interested in doing a 12" version.
  Reply With Quote
Old 7th April 2003, 07:01 AM   #3
CV is offline CV
diyAudio Member
 
Join Date: Nov 2002
Location: UK
Hi fellas,

It might *look* straightforward, but if you read the hifi+ interview with him (it may be available on his website), you'll see it's not quite simple; takes hours + hours to drill the tiny hole through the Nd magnet for instance. I wonder if drilling un- or demagnetised Nd and then charging the magnet would be easier.

Anyway, makes very interesting reading.

cheers
  Reply With Quote
Old 7th April 2003, 01:42 PM   #4
mgreene is offline mgreene  United States
diyAudio Member
 
Join Date: Jun 2002
Location: Aiken, South Carolina USA
Default Schroeder arms

Brett, CV,

I went to the archery store this weekend. A nice, good sized, carbon fiber shaft costs a wopping $5.

As to drilling the magnet, etc., - the interview is not on line where I can find it. CV - can you give us the technical gist of the interview?

Had a few more thoughts over the weekend. Might be possible to simplify construction and get a better result using misc parts such as various aftermarket upgrade parts (arm weights and VTA devices) for Rega and other arms.

Regards

Mike
  Reply With Quote
Old 7th April 2003, 10:28 PM   #5
diyAudio Senior Member
 
fdegrove's Avatar
 
Join Date: Aug 2002
Location: Belgium
Default SCHROEDER.

Hi,

You guys think it's simple?

No way.

Keeping magnets in place around a pivot is not simple at all.

Moreover, all the energy from the catridge has to be drained by the shaft, you see it ain't all that simple since there is no other way to drain of spurious energy.

Not that I want to discourage anyone of course,
__________________
Frank
  Reply With Quote
Old 8th April 2003, 12:35 PM   #6
CV is offline CV
diyAudio Member
 
Join Date: Nov 2002
Location: UK
Hi

...the interview in hifi+...

The Nd magnet is an extremely hard material; trying to drill a tiny hole in it and get rid of the swarf material (which is strongly attracted back to the block) is a nightmare. Took him about 8 hours to go a few mm IIRC...

Will try and dig out the magazine and see exactly what he had to say.

Why not try drilling a tiny hole in a cheap ferrite magnet and see how you get on with that?

cheers
cv
  Reply With Quote
Old 8th April 2003, 12:49 PM   #7
diyAudio Senior Member
 
fdegrove's Avatar
 
Join Date: Aug 2002
Location: Belgium
Default HI-FI +

Hi,

CV,

No need to dig it up.
There's a scan of the article on Frank Schroeder's tonearm on his website.
See the link in the first post.

Thought I'd save you the trouble,
__________________
Frank
  Reply With Quote
Old 8th April 2003, 01:39 PM   #8
mgreene is offline mgreene  United States
diyAudio Member
 
Join Date: Jun 2002
Location: Aiken, South Carolina USA
Default Schroeder arm article

Thanks CV. Something comes to mind - Schroeder is building with long term quality control in mind - I may be able to epoxy - if it eventually comes loose w/o destroying the cartridge it won't be a big deal.

Frank - Schroeder's interview is not included in the material on his website.

Mike
  Reply With Quote
Old 8th April 2003, 01:44 PM   #9
mgreene is offline mgreene  United States
diyAudio Member
 
Join Date: Jun 2002
Location: Aiken, South Carolina USA
Default Magnets and pivot point

So Frank,

What's the secret? It hadn't occured to me that the magnets could be unstable in this configuration - only a few thousandths apart.

Mike
  Reply With Quote
Old 8th April 2003, 06:16 PM   #10
diyAudio Senior Member
 
fdegrove's Avatar
 
Join Date: Aug 2002
Location: Belgium
Default REPELLING MAGNETS.

Hi Mike,

Quote:
What's the secret?
The problem as I see it is that the N/S relationship of two magnets is easlily disturbed when one is moved and the other held stable.
Surely you recall the force it takes to keep them in repelling position when held by hand?

This is a problem another German designer (it may even have been the same designer, I can't recall) faced with a similar offering about 15 years ago.

I really haven't got a clue how this one works, admittedly I only took a quick look at the pix on his site.
It seems to work well enough but untill I fully understand the design I'd better zip it.

Cheers,
__________________
Frank
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
My DIY Turntables and Schroeder based tonearm konstantin Analogue Source 24 26th March 2010 05:35 AM
Linear tracking tonearm vs. Pivoting tonearm Don Nebel Analogue Source 1 4th November 2007 10:49 PM
DIY Schroeder "Clone" Capt Zach Analogue Source 18 3rd March 2006 06:57 PM


New To Site? Need Help?

All times are GMT. The time now is 10:57 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2