uncomplete turntable project
i used michell orbe inverted bearing, the sub chasis is aluminium , motor and tonearm base bronze and stand alone. platter and ac motor from my michell syncro tt. all bases spiked.
i am waiting acrylic platter 6cm thickness. maybe i could be find magnet ring, i think bronze-teflon platter(30kg). i don't know calculate magnet push. my michell syncro ac motor is have problem. 33.3 rpm no problem but i change 45 rpm from pulley starting problem. problem is not starting 😀 i am using hand push.
i think adjustable speed motor( maybe origin live advanced motor).
after all this turntable good sound than my old michell gyro se mk2. deep imaging and good detail.
i used michell orbe inverted bearing, the sub chasis is aluminium , motor and tonearm base bronze and stand alone. platter and ac motor from my michell syncro tt. all bases spiked.
i am waiting acrylic platter 6cm thickness. maybe i could be find magnet ring, i think bronze-teflon platter(30kg). i don't know calculate magnet push. my michell syncro ac motor is have problem. 33.3 rpm no problem but i change 45 rpm from pulley starting problem. problem is not starting 😀 i am using hand push.
i think adjustable speed motor( maybe origin live advanced motor).
after all this turntable good sound than my old michell gyro se mk2. deep imaging and good detail.
That's some serious looking turntable Yildiray. I can't help you with the magnet thing, but there are others here who know about this sort of thing.
Good luck, Si.
Good luck, Si.
Great looking turntable, how about some detail on the rest of your system as well, it looks quite interesting..
hi Kevin, thanks.
my system:
speakers : reference3a mm decapo-i
amp: audionote quest 300b set with tungsol vt231, fullmusic 300b tubes
pre amp: diy( dact ct2 , elma switch, a lot of wbt nextgen female rca, audio consulting silver wire and aluminyum case shielding copper).
cd player : quad cd-p 99
phono pre: roksan caspian reference
speaker cables: tmc gold
interconnects: audio note an-vx and diy silver cables with eichmann male rca
all stands diy
power cables: furutechs and isotek
tonearms: rega rb300 with michell tecnoweight and rewireing cardas tonearm cables.
sme 3009 s2 improved
my system:
speakers : reference3a mm decapo-i
amp: audionote quest 300b set with tungsol vt231, fullmusic 300b tubes
pre amp: diy( dact ct2 , elma switch, a lot of wbt nextgen female rca, audio consulting silver wire and aluminyum case shielding copper).
cd player : quad cd-p 99
phono pre: roksan caspian reference
speaker cables: tmc gold
interconnects: audio note an-vx and diy silver cables with eichmann male rca
all stands diy
power cables: furutechs and isotek
tonearms: rega rb300 with michell tecnoweight and rewireing cardas tonearm cables.
sme 3009 s2 improved
Hi Yildiray,
Sounds like have a nice system there, I unfortunately do not know the answer to your question, but I imagine someone here who does will have some ideas for you within the next few days.. (weekends can be a bit slow here.)
Which of your arms do you prefer? I have an SME 3009 Series II which I like quite a lot, and I have rebuilt and modded using some of the Analogtubeaudio.de bits and pieces.
Sounds like have a nice system there, I unfortunately do not know the answer to your question, but I imagine someone here who does will have some ideas for you within the next few days.. (weekends can be a bit slow here.)
Which of your arms do you prefer? I have an SME 3009 Series II which I like quite a lot, and I have rebuilt and modded using some of the Analogtubeaudio.de bits and pieces.
I might know (or think that I do) the answer to your question but I'm not really sure what you are asking? If you use the 'search' function you will find quite a bit of information with regard to magnetic bearings. The reason you motor is reluctant to start the deck at 45rpm is likely 1/ motor torque is too low - look to the electronics as I believe the Syncro uses a high torque AC motor. 2/ the belt tension is too low - try moving the motor pod a little further away - the belt is stretched quite tight on Michell turntables, in my experience. I suspect that it is 2 and you are experiencing belt slip.
Changing the motor to one that allows electronic speed adjustment will not cure your slow start-up issue as it is a torque related issue - it is likely that DC motor you change to will have less torque than the unit you now use.
Changing the motor to one that allows electronic speed adjustment will not cure your slow start-up issue as it is a torque related issue - it is likely that DC motor you change to will have less torque than the unit you now use.
Hi Yildiray
If I understand right your platter weight is 30kg. If that is the case your turntable motor seems to be doing ok to me.
Push starting at 33 rpm will not do any harm and seems ok unless you do not want to push start. Once rotating you will not need a powerful motor as the weight of the turntable will keep the speed constant.
If you do not want to push start I would fit a second turntable motor.
Don
If I understand right your platter weight is 30kg. If that is the case your turntable motor seems to be doing ok to me.
Push starting at 33 rpm will not do any harm and seems ok unless you do not want to push start. Once rotating you will not need a powerful motor as the weight of the turntable will keep the speed constant.
If you do not want to push start I would fit a second turntable motor.
Don
Hum.. as I understood it the platter weight of 30kg was hypothetical and relates to a possible future platter that may be made from bronze and Teflon. It looks like the current platter is the one from a Michell Syncro (as he mentions the Syncro motor and it does look like one). In addition, there is mention of a 60mm thick acrylic platter which is very unlikely to approach anything like 30kg in weight. Also, I read it to mean that start-up was fine at 33.3 but struggled at 45. It seems as though a little clarification is required - it must be very difficult to post in a foreign language though.
first sorry for this chaos because my english is not enought.
now ým using michell syncros platter. this platter is like 3 kg but i think that its thiny design shows bad. bottom platter and upper platter there is 6.5 cm way. Because of this i think i ý need to use 6 cm platter. Ýf a use acrylic for this platter its weight will be like 6-7 kg
and its not problem for bearing but is i use aluminium materiel weight will be like 12 kg
if i make it crom or bronze like 30 kg (and i think 30 kg demages bearing) at this point there is a problem because of this i have to use magnet systems.
I found some Projects in this forum but i dont understand how peoples select magnets for their platter weight.
Other problem isa motor my motors pulley go away when im listening turntable then ý fixxed pulley with glue, but it was playstic and maybe glue makes it wearing off
YNWOAN write that make scale settings i made it. Ýn 33,3 rpm runing there is no problem but in 45 rpm when im starting it it goes slowly. At the future i will be change motor i buy a motor which runs with heavy platters.
Kevinkr i like sme 3009 it likes an art. Rega likes a bit analiytic, detailes are abit more.
But sme is sound is more warm and filled bass.
One month ago i was changed smes wiring. Ý bought shielded wire in partsconnexion
(cardas). And i run it rca to head shell. And this operation goes filled bass beacuse of this i dont like new sound i will make a new cabling to sme again.
Thanks so much for your helps . best regards
now ým using michell syncros platter. this platter is like 3 kg but i think that its thiny design shows bad. bottom platter and upper platter there is 6.5 cm way. Because of this i think i ý need to use 6 cm platter. Ýf a use acrylic for this platter its weight will be like 6-7 kg
and its not problem for bearing but is i use aluminium materiel weight will be like 12 kg
if i make it crom or bronze like 30 kg (and i think 30 kg demages bearing) at this point there is a problem because of this i have to use magnet systems.
I found some Projects in this forum but i dont understand how peoples select magnets for their platter weight.
Other problem isa motor my motors pulley go away when im listening turntable then ý fixxed pulley with glue, but it was playstic and maybe glue makes it wearing off
YNWOAN write that make scale settings i made it. Ýn 33,3 rpm runing there is no problem but in 45 rpm when im starting it it goes slowly. At the future i will be change motor i buy a motor which runs with heavy platters.
Kevinkr i like sme 3009 it likes an art. Rega likes a bit analiytic, detailes are abit more.
But sme is sound is more warm and filled bass.
One month ago i was changed smes wiring. Ý bought shielded wire in partsconnexion
(cardas). And i run it rca to head shell. And this operation goes filled bass beacuse of this i dont like new sound i will make a new cabling to sme again.
Thanks so much for your helps . best regards
Hi, if I understand correctly it does sound as though the motor pulley is slipping on the motors drive shaft - try putting a pencil mark on the top of the pulley so that you can see if it slips during start-up.
I'm afraid I decided on the magnets for my bearing partly by guessing and partly by making a number of prototypes.
Your motor should be able to start this platter no problem.
I'm afraid I decided on the magnets for my bearing partly by guessing and partly by making a number of prototypes.
Your motor should be able to start this platter no problem.
I ordered a pair of ring magnets for the same idea in my mind, here are the dimensions:
Outer diameter = 50 mm
Inner diameter = 30 mm
Height = 5 mm
Material: neodymium NdFeB N35
My plan is to install them in my Thorens TD160S, but soon it turned out that they are way too strong for the 30 N platter weigth (which I measured on a digital kitchen scale). It is difficult to measure the pushing force, I use the following method:
Find a suitable cylinder close to the inner diameter of the magnet. Put both magnets on the cylinder so that they push each other. Put the whole assembly on a personal scale. Push the upper magnet with another cylinder until they are close enough. "Close enough" means 2 to 5 mm. Then you can read the approximate force.
I installed the magnets for a quick test. The issue is that the axial movement of the platter is not free, there is considerable damping caused by the air column in the bearings. Is this a problem or an advantage, I could not decide yet.
Outer diameter = 50 mm
Inner diameter = 30 mm
Height = 5 mm
Material: neodymium NdFeB N35
My plan is to install them in my Thorens TD160S, but soon it turned out that they are way too strong for the 30 N platter weigth (which I measured on a digital kitchen scale). It is difficult to measure the pushing force, I use the following method:
Find a suitable cylinder close to the inner diameter of the magnet. Put both magnets on the cylinder so that they push each other. Put the whole assembly on a personal scale. Push the upper magnet with another cylinder until they are close enough. "Close enough" means 2 to 5 mm. Then you can read the approximate force.
I installed the magnets for a quick test. The issue is that the axial movement of the platter is not free, there is considerable damping caused by the air column in the bearings. Is this a problem or an advantage, I could not decide yet.
oshifs, re bearings, YNWAN and myself use similar maglev, based on on his original principle.
Put one of the ring magnets to one side, and use a circle of smaller disc magnets instead, then you can add and subtract one at a a time.
http://www.vinylengine.com/phpBB2/album_pic.php?pic_id=6163&full=true
Put one of the ring magnets to one side, and use a circle of smaller disc magnets instead, then you can add and subtract one at a a time.
http://www.vinylengine.com/phpBB2/album_pic.php?pic_id=6163&full=true
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