Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

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

So when designing a tonearm...
So when designing a tonearm...
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
Thread Tools Search this Thread
Old 2nd September 2012, 05:47 PM   #11
stratus46 is offline stratus46  United States
diyAudio Member
Join Date: Nov 2009
Location: Los Angeles
If the center hole is exactly on center and there are no warps, the mass becomes a non-issue but in the real world those things are not guaranteed so low mass/inertia helps. However low you manage to make the arm mass, it's orders of magnitude greater than the stylus assembly.

  Reply With Quote
Old 2nd September 2012, 08:08 PM   #12
maxlorenz is offline maxlorenz  Chile
diyAudio Member
maxlorenz's Avatar
Join Date: Oct 2003
Location: osorno , Chile
Maybe I did not manage to make myself clear...but I don't want to hijack this thread so I'll do my own experiments in the proper thread.

  Reply With Quote
Old 4th November 2012, 09:43 AM   #13
arturo1 is offline arturo1
diyAudio Member
Join Date: Jul 2011
The inertia to move the arm across the record is felt by the stylus, as the stylus suspension wears or dries up in the case of Audio Technicas' small rubber O ring the inertia creates record wear. Force times distance is the amount of weight you bring to bear when tightening a nut and bolt, so if you imagine removing your car wheel nuts with a small hand spanner against a socket set with extension arm you can see that less inertia is required with a long extension arm than a small spanner. Apply this back to your arm/cartridge and the longer arm requires less force from the stylus to move the arm across the record.
  Reply With Quote
Old 4th November 2012, 02:49 PM   #14
jlsem is offline jlsem  United States
diyAudio Member
jlsem's Avatar
Join Date: Jun 2003
Location: Dallas,TX
Once the static inertia (or moment of inertia) is overcome in the first revolution then there is dynamic inertia related to the rotational velocity of the arm that is present. As the rotational velocity of the arm increases ever so slightly with each subsequent revolution the inertia of the rotating arm builds. I would definitely like to see some experimental data that show these almost infinitesimal changes in inertia related to rotational velocity actually cause any audible distortion. It occurs to me that the rolling friction of the gimbal bearings is more important that the moment of inertia of the tonearm.


Last edited by jlsem; 4th November 2012 at 03:08 PM.
  Reply With Quote
Old 9th November 2012, 10:20 PM   #15
sled108 is offline sled108  United States
diyAudio Member
sled108's Avatar
Join Date: May 2008
Location: Deep in the Heart of North Jersey
I have Made, and Listened to this style Nanook Arm...And, it's really the Most Satisfying and Great Sounding Uni-Pivot DIY Arm that you can do without a Shop...I am Planning on making another, with a Carbon Arrow Shaft...So, I removed the Out-Riggers to see if they where Needed...And Yes, They Are...It will Wobble on the Vert. as soon as you Lift It...I put Them back On...And, I can Lift It, and Drop It into the Groove with No Vert. Wobble..
Click the image to open in full size.

Last edited by sled108; 9th November 2012 at 10:32 PM.
  Reply With Quote


So when designing a tonearm...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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Linear tracking tonearm vs. Pivoting tonearm Don Nebel Analogue Source 5 31st May 2015 03:55 AM
FS: Calrad SV-16 16" Transcription Tonearm (Grace Oil Damped Tonearm) dnewma04 Swap Meet 1 24th November 2011 12:45 AM
Second Tonearm JRKO Analogue Source 2 22nd December 2010 01:57 AM
What is this tonearm? IZHAKKATZ Analogue Source 3 23rd July 2007 09:13 PM
Designing for guys who like designing Sch3mat1c Tubes / Valves 14 31st August 2003 11:46 AM

New To Site? Need Help?

All times are GMT. The time now is 05:08 AM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright ©1999-2017 diyAudio