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Old 24th December 2010, 07:44 PM   #61
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Quote:
Jacques Merde: "VHS tape is not compliant and therefore not particularly forgiving in this respect. Better drive with a good source."
I agree. If driving the passive platter with an idler turntable, then the active platter is not used as a motor. It become a high speed motor driving an idler-wheel driving a platter and tape-driving another platter. Too many interfaces. Drive it with a direct drive turntable, a good source, so the DD table can act like a big motor and pulley. Keep it simple.

Again, the downside is that the set-up will take up a lot of space.

Last edited by directdriver; 24th December 2010 at 07:47 PM.
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Old 24th December 2010, 10:17 PM   #62
kevinkr is offline kevinkr  United States
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Quote:
Originally Posted by Greg M View Post
I have gotten the new bearings installed and it runs smoothly now. I think this motor has other issues though.
It gets too hot to touch!
I ran it all day a couple of days and it runs fine it just gets really hot.
I have tried both 3uF caps I had with the same results.
Does this indicate a problem in the windings?
The specs you posted earlier indicated that this motor has a rise of 40 C over ambient which means this is a fairly hot running motor.. Taking 20 C as typical then when fully warm this motor is running at 60 C or 140 F which is uncomfortably hot to the touch.

I had an early Hitachi cassette recorder with a two phase hysteresis-synchronous motor and it actually had a small fan on the rear shaft to cool the motor which even so ran noticeably warm..

If it holds speed under load and doesn't smoke it probably is fine. You can perhaps lower the voltage slightly once it starts which should reduce both heat and to some extent vibration. (Which since it is a hysteresis-synchronous motor should not be very pronounced to start with.)
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Last edited by kevinkr; 24th December 2010 at 10:20 PM.
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Old 25th December 2010, 03:47 PM   #63
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Quote:
Originally Posted by directdriver View Post
.




In this picture, I put a Technics SL-1400Mk2


.
In my case, I use Technics SL110 first model in this kind of product got a most powerful motor, I did modification of it's speed control, separated all the electric part away and changed speed adjuster to a better quality parts, extendsion wires to the motor coil a bit of work 15 wires, after the mods, it stable like a rock. but the platter not a really 90 degree sharp, I use elastic thread as the belt ( elastic material sound really wonderful vs non elastic things with lively), so I cut a really small grove to hold the thread ( no need send to machine shop for cutting just hold a sharp bite firm and hand turn can cut ) weight balance between two platters also will change the sound quality, you can adjust to your own favor
cheers tony ma
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Old 26th December 2010, 05:45 AM   #64
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Quote:
makaiyumtony: "Technics SL110 got a most powerful motor. I did modification of its speed control, separated all the electric part away and changed speed adjuster to a better quality parts. Extension wires to the motor coil a bit of work, 15 wires. After the mods, it's stable like a rock, but the platter not really 90 degree sharp, I use elastic thread as the belt so I cut a really small groove to hold the thread. weight balance between two platters also will change the sound quality, you can adjust to your own flavor"
Nice job, Tony! Thanks for sharing. It's great to see like minded people here. You're right about the early SL1100 that has a similar motor like the SP10, very high torque. I used to have three SP10Mk2 tables and was going to experiment with one, to take the platter and motor out of its stock chassis and mount it on a separate plinth and run extension wires to the electronics. I sold all the SP10's befor the project never was completed. I would love to hear the result of that. Oh well,... In the future I might try another similar project as I have an acrylic platter as the passive platter and I can use some of my DD table collection to drive it.

Nice idea on modding the sloped platter by cutting a groove for thread drive. I haven't tried thread or elastic belt yet but I am quite happy with tape and tape is easy to find and easy to splice to desired length, whereas a belt needs to be custom made and a thread is hard to be tied to a smooth knot.

Fun project! Any more future projects, please post and share. Thanks!

.
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Old 26th December 2010, 03:51 PM   #65
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[QUOTE=directdriver;

Nice idea on modding the sloped platter by cutting a groove for thread drive. I haven't tried thread or elastic belt yet but I am quite happy with tape and tape is easy to find and easy to splice to desired length, whereas a belt needs to be custom made and a thread is hard to be tied to a smooth knot.

Fun project! Any more future projects, please post and share. Thanks!

.[/QUOTE]
Elastic thread use as the belt,idea from the designer of SPJ, she sent a roll to my friend who own a SPJ TT charged $20, because so thin the knot will not bother, length fit also easy because of stretch just move and adjust the tension at the same time, tension also effect to the sound quality, I found similar thread only $4 a roll even better result from local garment material supply, 1 to 1 ratio drive, the thread can last quite long so far still in the first set, but my friend's ac motor is different story, the reason of sound quality change I guess is it can work as a spring to naturalize small speed change in turning. I don't think we can measure out that little change's difference in turning speed but can detect by the sound quality difference, once you try will never go back again. it needs hand turn both first before switch power on and adjust weight balance for almost stop completely at the same time after switch off
happy new year
tony ma
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Old 29th December 2010, 12:41 AM   #66
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Has anyone considered steam power?
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Old 10th June 2011, 01:28 AM   #67
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STOP PRESS>>>> it seems all the DD turntable guys formed a secret cult.... and caught a ride on an alien craft the day after christmas last year. all that they left was a note saying "so long and thanks for all the fish" ....reuters
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Old 10th June 2011, 05:27 AM   #68
benb is offline benb  United States
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At least they'll never have to come back to Earth to get a replacement belt.
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Old 24th January 2013, 01:21 AM   #69
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I purchased two green flywheel papst motors from ebay for possible use in a diy turntable project. I know nothing of them and got little info from the seller but the price was right...highest bidder at 16.50 cdn...I am looking to get a power supply/speed control for them...I will try to attach pics for these (original from ebay)...Motor numbers are as follows: KLO 14.50-2-420D followed by a triangle symbol...second line reads as follows: 7cha Nr 7882-064...what type of motor is this AC or DC?..could these possibly be 3 phase?...no indicaton of voltage, frequency etc...any info or help would be appreciated.
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Last edited by Stuartarm; 24th January 2013 at 01:40 AM.
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Old 24th January 2013, 05:09 AM   #70
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Quote:
Originally Posted by Straight Tracker View Post
Back in the seventies I worked as a mechanical designer for Scully Recording instruments in Connecticut. I worked on tape transport design and the preferred Hystersis Synchronous Motors at the time were from Ashland, Bodine, ELINCO ( Electric Indicator Company ) Papst and Beau Motor. They generally had sleeve bearings nearest the capstan for low noise and ball bearings at the far end. I still have a 2-speed ( 600 RPM & 1200 RPM ) Papst motor and a 300 RPM Beau Motor from those days. I bet they would make excellent motors to drive turn tables. Both are so-called
"inside out motors" I'm going to check out the companies I've mentioned
to see if they're still around. I know Papst is. This thread reminded me of
the fact that I still have those motors and it gave me the idea to possibly
design and build my own turn table. That is when I'm done with building
my own tangential tone arm. I'll report if I find out anything about the
companies I've mentioned.

Thanks,

Ralf
I purchased two green flywheel papst motors from ebay for possible use in a diy turntable project. I know nothing of them and got little info from the seller but the price was right...highest bidder at 16.50 cdn...I am looking to get a power supply/speed control for them...I will try to attach pics for these (original from ebay)...Motor numbers are as follows: KLO 14.50-2-420D followed by a triangle symbol...second line reads as follows: 7cha Nr 7882-064...what type of motor is this AC or DC?..could these possibly be 3 phase?...no indicaton of voltage, frequency etc...any info or help would be appreciated.
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