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Post by karma67 on Sept 18, 2021 15:36:39 GMT
Fans of sp10's and albert porters plinths designs will be familiar with his bearing drain concept. i thought i'd have a go and see if it works or does bugger all on my spare tts-8000.
heres a rough sketch of my design.
so the first job is to turn a 10mm thick brass donut,this inturn is threaded to accept the thrust pad/drain rod. when screwed in the whole bearing assembly is connected to the drain rod..
here's a photo of the new donut,its not parted off yet but has been drilled and threaded to take the drain rod. the face you can see is the underside and has been dished to clear the hump around the thrust pad thread on the black sony bowl.
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Post by gninnam on Sept 18, 2021 17:29:56 GMT
Heard about this mod - hope you can hear the benefits when you are done.
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Post by electronumpty on Sept 18, 2021 18:15:51 GMT
Ooh proper engineering malarkey, nice!
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Bigman80
Grandmaster
The HiFi Bear/Audioaddicts/Bigbottle Owner
Posts: 16,399
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Post by Bigman80 on Sept 18, 2021 18:41:12 GMT
Hoping this is a pic heavy thread!
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Post by antonio on Sept 19, 2021 5:16:13 GMT
I was hoping James might have another 'spare' kicking around and kindly donate it to me.
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Post by karma67 on Sept 19, 2021 6:17:29 GMT
I was hoping James might have another 'spare' kicking around and kindly donate it to me. who the fuk is james? lol |
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Post by macca on Sept 19, 2021 7:22:23 GMT
A band from the 1980s.
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Post by karma67 on Sept 19, 2021 7:58:46 GMT
oh just sit down macca!
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Bigman80
Grandmaster
The HiFi Bear/Audioaddicts/Bigbottle Owner
Posts: 16,399
Member is Online
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Post by Bigman80 on Sept 19, 2021 8:00:14 GMT
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Post by macca on Sept 19, 2021 8:00:22 GMT
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Post by antonio on Sept 19, 2021 22:47:23 GMT
I was hoping James might have another 'spare' kicking around and kindly donate it to me. who the fuk is james? lol Sorry, Jamie, anyway havya got another 'spare'  |
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Post by karma67 on Sept 25, 2021 15:21:37 GMT
lol no mate sorry 
a bit more work done today,the design has changed to incorporate simons idea of using silicone oil as a damping agent, i will turn a larger hole in the brass base to accommodate the oil and sink the bottom of the drain rod into it,it will then be held rigid with grub screws.    |
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Post by gninnam on Sept 25, 2021 15:57:53 GMT
Looking very good is that - hats off to ya!
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Post by sq225917 on Sept 25, 2021 16:03:38 GMT
Bigger flat paddle, surface area is your friend. Make them adjustable, two bow tie paddles above each other than you can rotate to open close a bit like an old rotary air vent.
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Post by karma67 on Sept 25, 2021 16:16:02 GMT
just checking but you do realize the drain rod is static yes?.
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Post by karma67 on Sept 26, 2021 13:34:28 GMT
more work on the drain rod/thrust pad. i've chosen lignum vitae as the thrust pad material. a lock nut has also been fabricated and the rod machined part way down to pass through the hole in the pcb. the pcb will need to be lifted away (stand offs) by approximately 16mm to clear the lock nut.   |
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Post by gninnam on Sept 26, 2021 14:25:06 GMT
 Nice work - very professional
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Post by electronumpty on Sept 26, 2021 14:37:51 GMT
Yeah, looks great, 👌
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Post by karma67 on Oct 10, 2021 10:42:13 GMT
slight change of design to the rod and the vibration sink has now been machined so i will fit it today and see what if any difference its made,the gap around the rod can be filled with silcone oil or left empty,the set screws can also be tightened or left loose.   |
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Post by karma67 on Oct 16, 2021 9:15:17 GMT
today im doing listening tests,it would seem so far that adding silcone is beneficial.  |
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Post by rexton on Oct 16, 2021 9:42:39 GMT
Well done, Jamie, your certainly push this TT as far as possible. Reminds me of my exploits on my GL75 (altough not in the same league as yourself) !!
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Post by karma67 on Oct 16, 2021 11:05:44 GMT
Well done, Jamie, your certainly push this TT as far as possible. Reminds me of my exploits on my GL75 (altough not in the same league as yourself) !! thanks andrew,my initial thoughts are very positive,i cant say for sure until i plumb my other one back in but it doesn't sound far behind it if at all. |
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Post by rexton on Oct 16, 2021 11:52:45 GMT
That's really positive. It's nice to see experimentation and seeing how far we can push these decks.
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Post by karma67 on Oct 17, 2021 6:53:39 GMT
my thoughts on yesterdays listening. positive,my main tt sits in a custom made panzerholz plinth and the turntable has been fitted with torlon spindle bushes which drastically lowered the noise floor over the standard bronze oilites. its mounted on a wall shelf my other tts sits in sonys own tb1 resin plinth and it is that turntable that has the bearing drain/brace fitted.it sits on top of a rack the best outcome i hoped for was to match the torlon bushed one. i think that has been achieved as after 4 hours of continuous listening i really didnt feel the need to go back to the other turntable! it would seem to me that the bearing drain is doing excactly that, draining away unwanted bearing noise as the noise floor has been lowered.
the silicone oil viscosity makes a difference as does the tightness of the grub screws,i settled on 30000 cst oil and just slightly tight on the screws, more grades of oil could be tried later. the lignum vitae thrust pad also seems to be holding up well and has no detrimental effects that i can tell to the sound. i will give it a week of use and then go back to my no.1 turntable to compare. if my findings have not changed my next thoughts will be to incorporate the bearing drain into the torlon bushed turntable.
sp10 users should consider this mod!
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Post by gninnam on Oct 17, 2021 11:55:33 GMT
Great result and looks awesome - when can I place an order for one then  |
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Post by karma67 on Oct 17, 2021 12:30:14 GMT
thanks mate,i wish you lot were nearl by so you could have a listen,i'll let you know when the mass production starts |
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Post by sq225917 on Oct 17, 2021 13:00:21 GMT
Looking good Jamie.
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Post by mayebaza on Oct 17, 2021 15:41:07 GMT
Excellent work Jamie 👍🏿
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Post by antonio on Oct 18, 2021 1:54:07 GMT
^^^^^^^^^
+1
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Nice work - very professional 
