My Linear Tracker (a new variation perhaps?) - Page 2 - 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 12th March 2014, 06:40 PM   #11
soyuz is offline soyuz  Chile
diyAudio Member
 
soyuz's Avatar
 
Join Date: Feb 2013
Quote:
Originally Posted by carolus View Post
I sent you a copy-scan from my old archive "Radio Bulletin " (Dutch) anno 1960 apr. page 308 (fig 99) with a brief description (& fig) with the same concept. The ref. name (probably diy constructor) Mr Percy WILSON ....
I hope to see soon your "end" model (& not the last, I presume)....
Do it.
Allez, salukes.
Karel
once again thank you very much Karel for the scans, a very beautiful and interesting design.

compilation of "side view" diagrams:
Percy Wilson
Click the image to open in full size.

Click the image to open in full size.

The arm I'm currently using:
Click the image to open in full size.

Mankowitz (the arm is tilted, this image is a more clear representation ):
Click the image to open in full size.
  Reply With Quote
Old 15th March 2014, 11:36 AM   #12
diyAudio Member
 
Join Date: Mar 2012
I'm so intrigued by this that I'm going to rig one up. I still have difficulty in believing the two ball bearings remain equidistant in operation- the only way to find out is give it a go and then report back.
Chris
  Reply With Quote
Old 15th March 2014, 01:11 PM   #13
diyAudio Member
 
Arch Stanton's Avatar
 
Join Date: Mar 2012
Obviously if the two balls roll and don't slip they stay equidistant.
  Reply With Quote
Old 15th March 2014, 01:30 PM   #14
diyAudio Member
 
Join Date: Mar 2012
Hello Arch-agreed-as long as in practice they don't slip or stick. The elegant simplicity appeals to me.
Chris
  Reply With Quote
Old 15th March 2014, 03:16 PM   #15
bgruhn is offline bgruhn  United States
diyAudio Member
 
Join Date: Feb 2008
Location: Medfield, MA, USA
Quote:
Originally Posted by ChrisG139 View Post
Hello Arch-agreed-as long as in practice they don't slip or stick. The elegant simplicity appeals to me.
Chris
Hi Chris,
A few days ago I took my four 10mm tubes, taped them together in 2 pairs, placed them on a level surface with two 4mm balls between them and just played with them for a short time. Was amazed by the lack of friction in both horizontal and vertical planes. The freedom of vertical motion could wind up being detrimental ????. Have had a sudden increase of activity in my clock shop so have not built a functioning arm yet, but it isn't far away. Getting rid of all those balls and races certainly is attractive.
Rgds,
BillG
  Reply With Quote
Old 15th March 2014, 03:38 PM   #16
Dyolf is offline Dyolf  Norway
diyAudio Member
 
Join Date: Apr 2009
Quote:
Originally Posted by ChrisG139 View Post
Hello Arch-agreed-as long as in practice they don't slip or stick. The elegant simplicity appeals to me.
Chris
As I said in a previous post, I have had this design up and running for almost 3 years without any misbehaving. Only reason for redesigning, is the wish to make it less exposed to dust, and getting the balls closer to the record surface. This will implement some sort of sliding arrangement to move the carrige out of the way, in order to change records. Spring is on its way here in snowy Norway, so this may have to wait til october
Steen
  Reply With Quote
Old 15th March 2014, 03:46 PM   #17
diyAudio Member
 
Join Date: Mar 2012
Hi Everyone
I've got all the parts lying around and did a similar thing to Bill with two alu tubes. Sure enough, the lack of friction was incredible. I don't think there will be an issue on the vertical plane as long as the rods are well secured and horizontal. I believe it's a couple of hours work so I should have something up and running well before Easter.
Chris
  Reply With Quote
Old 15th March 2014, 05:08 PM   #18
Calvin is offline Calvin  Germany
diyAudio Member
 
Calvin's Avatar
 
Join Date: Nov 2004
Location: close to Basel
Hi,

I also wondered about the vertical friction maybe beeing too high to allow the cart to track warps properly.
If that is the case than a slight modification might solve the issue.
If one looks at the crossectional drawings 1 and 3 in #11 it is obvious that each ball contacts the lower and the upper 'rail' in two points each.
A tiliting of the cartridge beam in vertical direction opposed by the friction between the ball and the upper 'rail'.
If the upper 'rail' is made from a curved track instead of two rods, a cartridge beam attached to the curved track could tilt nearly frictionless, as the ball and the 'rail' would contact in only one point.
The curved track could be a section cut from a tube with a diameter a bit larger than the ball's.
It could also be a complete tube like in drawing 1 the 'upper carriage' but without the W-shaped part named 'Slede met V-Groef'.

jauu
Calvin

p.s just in case the idea would be new and would hold enough invention depth to grant a patent, this is now known art and open source to anybody

Last edited by Calvin; 15th March 2014 at 05:10 PM.
  Reply With Quote
Old 15th March 2014, 05:13 PM   #19
diyAudio Member
 
Arch Stanton's Avatar
 
Join Date: Mar 2012
And if you take the two half parts of the tube, one for the low rail, the other for the up rail, you have only two contact points for each ball.

But it swings this way.
  Reply With Quote
Old 15th March 2014, 07:46 PM   #20
diyAudio Member
 
Join Date: Nov 2010
Location: Prescott, Arizona
Default Hi Calvin

Quote:
Originally Posted by Calvin View Post
this is now known art and open source to anybody
That is true for Europe but not for the United States. In the US, one is allowed a one year grace period after making an invention public. Aside from that, I don't think the idea is patentable because the drawers in file cabinets have been operating that way for decades.

That does not mean that this idea wouldn't make a great tone arm.

Sincerely,

Ralf
  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
E-MU Tracker Pre phase issues ghemml Equipment & Tools 8 10th February 2014 01:41 PM
Issues with Emu tracker and THD measurements Stefanoo Solid State 165 4th May 2012 01:20 AM
How to operate waveform tracker? Or is it busted? head_unit Equipment & Tools 1 3rd September 2010 09:53 PM
E-MU tracker GK Everything Else 7 9th November 2009 01:14 PM


New To Site? Need Help?

All times are GMT. The time now is 12:35 AM.


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