Motor position - 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 16th October 2010, 03:09 PM   #11
diyAudio Member
 
Join Date: Feb 2006
Location: Ulverston in Cumbria
Nanook, can you explain a bit more? I would be interested in the source of these lateral vibrations and how these have a different effect depending on motor position. Is it a case that 7 7:30 is optimum but 9 o clock would be better than 11 etc?
  Reply With Quote
Old 16th October 2010, 11:55 PM   #12
diyAudio Member
 
Jacques Merde's Avatar
 
Join Date: Oct 2009
Nanook,

I have to admit to having not given that much thought. My initial reaction is that it would be a bigger issue for some design directions than for others. For example, a light suspended subchassis design might be particularly sensitive. Noisy motors, like the commonly available steppers and (most) PMBDC types would also be prone to issues.

Doesn't seem like it would be too hard to take some meaningful measurements, though. Hmmm...
__________________
"For every complex problem, there is a solution that is simple, neat, and wrong." -- H.L. Mencken
  Reply With Quote
Old 19th October 2010, 02:50 AM   #13
Nanook is offline Nanook  Canada
diyAudio Member
 
Nanook's Avatar
 
Join Date: Feb 2004
Location: Chinook Country.Alberta
Default fellas....

if assuming that the vibrations are random and distributed evenly.

if at the "11 o'clock" position, any vibration will almost always create a much larger vibration (based on vector analysis) in the lateral direction (where it the cantilever and arm can very easily be moved) compared to the dorsal direction (in-line to the tonearm), assuming the arm pivot is firmly located.

If at the "7:00 o'clock" position , assuming the pivot is firmly mounted, then the dorsal movement will be very minimal as the angle will be much smaller, therefore the magnitude of the vibration acting on the cantilever will be reduced.

to me it seems intuitive. Someplace I did all the math, but lost it all in "the crash of summer 2010"
__________________
stew -"A sane man in an insane world appears insane."
  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
Compact Disc Motor and Turntable - Advices for Replace and Motor Service wanted tiefbassuebertr Digital Source 5 2nd August 2010 09:19 AM
Lambda motor vs. XBL^2 motor vs. any other motor Thinkcat Subwoofers 16 23rd December 2008 06:23 AM
25-position switched attenuator using a pair of 5-position switches? ray_moth Tubes / Valves 1 4th May 2008 08:02 AM
DIY TT: motor, motor PS, platter speed measurements dice45 Analogue Source 52 9th May 2006 01:07 PM
2 position servo/stepper motor breguetphile Parts 7 12th September 2004 11:31 PM


New To Site? Need Help?

All times are GMT. The time now is 07:13 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