Micro-Seiki MB-10 TT - Too Slow..!
 User Name Stay logged in? Password
 Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read Search

 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
woodturner-fran
diyAudio Member

Join Date: Jan 2006
Location: Ireland
Quote:
 The next section (45 rpm drive) is slightly narrower. It steps down in dia by about 4 mm from the lower section (90 deg edge on the step). This section is a "parallel cylinder", no "high or low spots"

well you might have answered that there. See the homemade pulley shown in the pic below. See the way its fatter in the middle and thinnner top and bottom - the motor angle is meant to be adjusted so that the belt rides on the widest part. But you seem to have that sorted.

Last thing I can think of:

Could you measure (accurately with a vernier callipers) the diameters of the drive pulley and the platter (where the belt rides) and work out the ratio of one to the other. So if the motor runs at 250rpm at 50Hz, the ratio of the pulleys should give you 250/33.3=7.507

After that I'm all out of ideas on what to do here....

Fran

 11th April 2008, 11:32 PM #22 stoolpigeon   diyAudio Member     Join Date: Feb 2007 Location: Laputa At the risk of repetition, you cannot leave out the belt in this calculation. sp
 12th April 2008, 01:42 PM #23 makinson1   diyAudio Member     Join Date: Aug 2004 Location: Tallahassee, FL Don't quite understand this. Doesn't the calculation depend upon the inside diameter of the belt, which is the same regardless of the outside diameter of the belt?
 13th April 2008, 01:37 AM #24 stoolpigeon   diyAudio Member     Join Date: Feb 2007 Location: Laputa What you have to look at are the effective diameters of the pulley and hub driven by a flexible belt of thickness t. These can be approximated as actual diameter plus 0.5 t on each side ie actual diameter plus t. Now if pulley and hub are the same diameter there will be no effect but because the pulley is usually much smaller there is a relative increase in its diameter. I measured a Thorens TD160 to have pulley approx 13.8 mm and hub approx 159 mm. Motor speed is 375 rpm so no belt hub speed is 375 x 13.8/159 = 32.5 rpm I don't have the belt but it is probably 0.5mm thick so with a belt effective hub speed is 375 x 14.3/159.5 = 33.6 rpm Difference is around 3% sp
 28th February 2016, 08:37 AM #25 bergui45   diyAudio Member   Join Date: Dec 2007 Hi, I bought a replacement belt on ebay for my BL-10X and the speed was innacurate! So i bought another one from another shop and it did the trick! Check your belt thickness and stifness and use only one that's exactly the sma than the genuine part!
 5th March 2016, 07:34 PM #26 bulgin   diyAudio Member   Join Date: May 2006 Can you check the belt's deflection - somewhere between the motor pulley and the platter rim? It should be +- 4 to 5mm before you start feeling some resistance. It's difficult to guess from hot as hell Cape Town but the Micro Seiki turntables are favourites here at chez bulgin. bulgin

 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 Rules
 Forum Jump User Control Panel Private Messages Subscriptions Who's Online Search Forums Forums Home Site     Site Announcements     Forum Problems Amplifiers     Solid State     Pass Labs     Tubes / Valves     Chip Amps     Class D     Power Supplies     Headphone Systems Source & Line     Analogue Source     Analog Line Level     Digital Source     Digital Line Level     PC Based Loudspeakers     Multi-Way     Full Range     Subwoofers     Planars & Exotics Live Sound     PA Systems     Instruments and Amps Design & Build     Parts     Equipment & Tools     Construction Tips     Software Tools General Interest     Car Audio     diyAudio.com Articles     Music     Everything Else Member Areas     Introductions     The Lounge     Clubs & Events     In Memoriam The Moving Image Commercial Sector     Swap Meet     Group Buys     The diyAudio Store     Vendor Forums         Vendor's Bazaar         Sonic Craft         Apex Jr         Audio Sector         Acoustic Fun         Chipamp         DIY HiFi Supply         Elekit         Elektor         Mains Cables R Us         Parts Connexion         Planet 10 hifi         Quanghao Audio Design         Siliconray Online Electronics Store         Tubelab     Manufacturers         AKSA         Audio Poutine         Musicaltech         Aussie Amplifiers         CSS         exaDevices         Feastrex         GedLee         Head 'n' HiFi - Walter         Heatsink USA         miniDSP         SITO Audio         Twin Audio         Twisted Pear         Wild Burro Audio

 Similar Threads Thread Thread Starter Forum Replies Last Post MiiB Analogue Source 2 28th May 2007 03:14 PM gotster Analogue Source 0 11th January 2005 07:44 PM Cobra2 Analogue Source 18 15th November 2003 09:33 PM ktigerb Analogue Source 0 27th May 2003 09:16 AM

 New To Site? Need Help?

All times are GMT. The time now is 11:59 PM.

 Home - Contact Us - Advertise - Rules - diyAudio Store - Sponsors - Privacy Statement - Terms of Service - Top - Opt-out policy

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 16.67%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.