+ Reply to Thread
Page 1 of 22 12311 ... LastLast
Results 1 to 10 of 219

Thread: IanMac Bearing

  1. #1
    Join Date: Oct 2012

    Location: Napier, New Zealand

    Posts: 1,532
    I'm Andrei.

    Default IanMac Bearing

    This follows on from the thread: Can you improve the Stock Bearing. IanMac has done an interesting mod on the stock bearing but it should have a thread of its own.


    For those who have not followed that thread the short point is that IanMac has essentially used a Teflon, a known slippery material for the thrust-pad. In principal this seems a brilliant and obvious idea and surely can only reduce rumble. The problems, if I understand it correctly, were twofold. First Teflon is not hard enough, and second keeping this material in place would require a new housing. The first problem Ian has solved by using a very hard type, called Peek. Second, his engineering skill have enabled him to make a housing.


    Below is a comparative picture.


    [IMG][/IMG]




    The Mike New bearing is on the left, a stock bearing in the centre and the IanMac on the right.


    I've had my IanMac bearing for quite a while now and I have decided I will keep using it. I have done a comparison of four bearings spin down times. When I say 'four' I have tested the IanMac Bearing twice, once as supplied, and then in a bath of oil. Here are the results.


    [IMG][/IMG]


    Each entry is an average of five readings. Larger numbers are better. I have done the test for each bearing in four scenarios. Twice with platter only at 33 and 45 rpm. And twice with a 5mm Achromat, 180 gram LP and the Michel Clamp. So at 33 rpm with platter only the IanMac bearing takes a little over 20 seconds to stop spinning. This is an improvement over the stock bearing.


    Subjectively the IanMac bearing seems to have improved over the weeks I have had it, so maybe there is some benefit to running it in, though I did notice an improvement over the MNB straight out of the box as it were. I am not sure about the oil bath. I think improved slippery oils would help if it was a metal against metal bearing / thrustpad contact. But with Peek I am not so sure.


    I have taken some readings in Audacity. I have used the silent groove on The Ultimate Analogue Test LP by Analogue Productions. They look like this in Audacity:

    [IMG][/IMG]

    I have taken Plot Spectrums from the Analyze menu. But I do not know how to interpret them. Anyone know what they mean and what are the best paramaters to choose.

    [IMG][/IMG]


    The net result is that I will be using IanMacs bearing from now and in due course will put my MNB up for sale. I will continue to experiment with different lubricants. I have a suspicion though that it may be best without any lubricant.
    [COLOR=#a52a2a][B]Sources:[/B] [B]1[/B][/COLOR] PC & Wyred4Sound DAC-2 DSDse   [COLOR=#a52a2a][B]2[/B][/COLOR] Oppo BDP105   [COLOR=#a52a2a][B]3[/B][/COLOR] Technics SL·1210 MK5 (Jelco 750D · Benz Wood).    [COLOR=#a52a2a][B]Speaker Cable[/B][/COLOR] [COLOR=black]Nordost Frey.[/COLOR]    [COLOR=#a52a2a][B]Interconnects [/B][/COLOR][COLOR=#000000]Oyaide[/COLOR][COLOR=black] & [/COLOR][COLOR=#000000]Geisha [/COLOR][COLOR=black]Silver.
    [/COLOR][B][COLOR=#a52a2a]Phono Stage [/COLOR][/B][COLOR=black]Fosgate Signature V2. [/COLOR]   [COLOR=#a52a2a][B]Preamp [/B][/COLOR][COLOR=#000000]Ayon Eris[/COLOR][COLOR=black]. [/COLOR]   [COLOR=#a52a2a][B]Power Amp[/B][/COLOR] [COLOR=Black]ATC P1. [/COLOR]  ​ [COLOR=#a52a2a][B]Speakers[/B][/COLOR] Triangle Magellan Cello.     [COLOR=#A9A9A9]Oh Sting, where is thy death?[/COLOR]

  2. #2
    Join Date: May 2012

    Location: Dagenham Essex

    Posts: 8,907
    I'm I'mteachingmarcotheartofpishanto.

    Default

    Did you include any bearing contact size / friction calculations / measurements ?
    Music , fills the gaps between silence !

    TAT Sale post Leader " Marcos Mentor "

    Also a pishanto specialist confirmed by Head Daftee

    Real name " Allen " or "Zoomer Nut”, “Numpty Napper”.

    ±± KEEP IT REEL

  3. #3
    Join Date: Oct 2012

    Location: Napier, New Zealand

    Posts: 1,532
    I'm Andrei.

    Default

    Quote Originally Posted by Audio Al View Post
    Did you include any bearing contact size / friction calculations / measurements ?
    No. What would you calculate and measure?
    [COLOR=#a52a2a][B]Sources:[/B] [B]1[/B][/COLOR] PC & Wyred4Sound DAC-2 DSDse   [COLOR=#a52a2a][B]2[/B][/COLOR] Oppo BDP105   [COLOR=#a52a2a][B]3[/B][/COLOR] Technics SL·1210 MK5 (Jelco 750D · Benz Wood).    [COLOR=#a52a2a][B]Speaker Cable[/B][/COLOR] [COLOR=black]Nordost Frey.[/COLOR]    [COLOR=#a52a2a][B]Interconnects [/B][/COLOR][COLOR=#000000]Oyaide[/COLOR][COLOR=black] & [/COLOR][COLOR=#000000]Geisha [/COLOR][COLOR=black]Silver.
    [/COLOR][B][COLOR=#a52a2a]Phono Stage [/COLOR][/B][COLOR=black]Fosgate Signature V2. [/COLOR]   [COLOR=#a52a2a][B]Preamp [/B][/COLOR][COLOR=#000000]Ayon Eris[/COLOR][COLOR=black]. [/COLOR]   [COLOR=#a52a2a][B]Power Amp[/B][/COLOR] [COLOR=Black]ATC P1. [/COLOR]  ​ [COLOR=#a52a2a][B]Speakers[/B][/COLOR] Triangle Magellan Cello.     [COLOR=#A9A9A9]Oh Sting, where is thy death?[/COLOR]

  4. #4
    Join Date: May 2012

    Location: Pastures new

    Posts: 4,721
    I'm Nobody.

    Default

    Peek is a good choice, as peek ceramic bearings are quite common.
    I would suggest that your choice of oil is not the best.

    It would also be interesting to compare the funk bearing, as this is another proven combination of materials.

  5. #5
    Join Date: Apr 2013

    Location: Granes - Haut Vallee de l'aude - EU

    Posts: 2,833
    I'm Richard.

    Default

    I can probably bring you a bearing and (shop soiled) platter this weekend cagey, although the news last night that the agent has sold the house we wanted to buy to someone else and air traffic control strikes threatened are making us consider cancelling the trip

  6. #6
    Join Date: Jan 2008

    Location: Wrexham, North Wales, UK

    Posts: 86,329
    I'm AudioAl'sArbiterForPISHANTO.

    Default

    Air traffic control? If I lived in Kent, I'd be driving to France [and collecting some wine en route]!

    Sorry to hear about the house.

    Marco.
    http://www.thestainedglasscompany.com

    "A man is a success if he gets up in the morning and gets to bed at night, and in between he does what he wants to do" -- Milan Kundera.

    BE HAPPY EVERYDAY!

  7. #7
    Join Date: May 2012

    Location: Pastures new

    Posts: 4,721
    I'm Nobody.

    Default

    Bad news on the house.
    Air traffic control strikes are affecting things for sure today, and possibly tomorrow.

    I'm certainly interested in trying the bits, as it will be an interesting comparison with the Mike New bearing and the Mk1 Funk platter. The only thing missing would be Ian's bearing.

  8. #8
    Join Date: Feb 2008

    Location: Down South

    Posts: 2,349
    I'm Neal.

    Default

    I would't put any value in spin down times they mean diddly squat! You'd hate the grease bearing in my KD-990
    Listening in a Foo free Zone...

    Only a Sith deals in absolutes.

  9. #9
    Join Date: May 2012

    Location: Pastures new

    Posts: 4,721
    I'm Nobody.

    Default

    For me it will be about noticeable drops in the "noise floor".
    Very subjective, but I don't have any real way of measuring it.

    I'll trust my ears to decide if there is any difference.

  10. #10
    Join Date: Apr 2013

    Location: Granes - Haut Vallee de l'aude - EU

    Posts: 2,833
    I'm Richard.

    Default

    Quote Originally Posted by Marco View Post
    Air traffic control? If I lived in Kent, I'd be driving to France [and collecting some wine en route]!

    Sorry to hear about the house.

    Marco.
    Thanks. We drove last time - but are "trialling" living out there and working here. And even from sunny Kent its a long slog. A good 9 hours, 10 hours really from Calais to the house. Plus ferry / tunnel, plus an hour in Kent - it ends up being 15 hours. Possible, but exhausting for a single driver. Gutted (and angry) about the house..

+ Reply to Thread
Page 1 of 22 12311 ... LastLast



 

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •