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Thread: Cheap upgrade for michell gyro

  1. #1
    Join Date: May 2016

    Location: north wales uk

    Posts: 45
    I'm peter.

    Default Cheap upgrade for michell gyro

    Hi i have just done some very cheap upgrades that really work to my gyro , changed the suspension tower ball bearing to Delrin 7/32 and that made a great difference the cost we £2.88 for 10
    Bought a ceramic ball bearing and replaced the 7/32 steal one with the ceramic one cost was about £6 , for 5 , added zx1 super lube to the oil a friction reducer cost was £6.90, this helped a lot in reducing the drag of the main bearing so much so i had to adjust the speed with the Nc power supply , also made a ptfe cartridge damper out of 1.5 mm sheet Teflon, cost £5
    all bought off eBay , and all work the first upgrade helped in the voicing, it cleared things up , the changing of the main bearing to a grade 5 7/32 bearing made a lot of difference as the ball is more rounder then the standard ball. so helped with any noise coming from the bearing , the PTFE damper worked great that made the bass have a bit more extension , i also bought some 50mm M5 Nylon cheese head screws£4 to replace the steel ones in the arm board , had a Delrin spacer made to go under the arm board a bit like the Gert Pederson one but cost less than £8 , the machining done on that by the supplier who charged me £10 for doing that so the total cost with machining was £18 all in , i also used nylon 2.5mm screws to lock the cartridge onto the tone arm , so the only thing that 'rings' is the cartridge , also added some 1.5mm sound dead matt to the inside of the tower covers, and 3 'o' rings to the bottom of them
    At each stage of these cheap Mods which can be reversed and not cost a fortune if you don’t like the results, but everything to me made a difference, to the sound quality and the depth of sound , i was hearing at very little cost. All bought off eBay
    Last edited by gwernaffield; 18-07-2017 at 10:32. Reason: spell check

  2. #2
    Join Date: Oct 2008

    Location: Glasgowshire

    Posts: 6,107
    I'm availableforweddingsAndBarmitzvas.

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    Excellent post Peter.

    As a Michell owner myself I've dabbled with various upgrades alomg the way, haven't thouht to replace the steel ball bearings.

    can you give a link so I can pick some up mate?
    thanks.

    oh,
    do you have the Orbe screw down clamp?
    Dampning the inside of it with isodamp compound made amworthwhile improvement.
    It's good to be aware of the parameters under which a device performs. It's not terribly useful to be scared off by them..


  3. #3
    Join Date: May 2016

    Location: north wales uk

    Posts: 45
    I'm peter.

    Default

    Hi i don’t use a clamp , i have a great big 700grm weight ,got fed up with pushing the dam clamp on and off and then buying the screw down version all the parts i used were off eBay , i made spacers and drilled them off using the std arm board , they are similar to what gert pederson arm board looks like but with the use of Delrin and nylon bolts (chees head screws) no need for 'o' rings , as nothing should travel down the nylon , before if you tapped the deck ,the tone arm would pick it up as the connecting bolts allowed it , but now i can tap the deck and no extra noise out of the speakers , only when the record is on the deck and playing should you hear anything ,
    the little peace of 1.5 mm 18mm x18mm PTFE has stopped a lot you can either buy them already made off eBay for £20 or make one for £2 , as i said all the stuff was bought off eBay , some i had to wait for as they came from china grade 5 ceramic ball bearing , the plastic ones Delrin http://www.ebay.co.uk/itm/BEARING-OP...MLtlBRE0h0_taQ
    all the little tweaks or upgrades done dont require you to drill or damage the orbe or the gyro in any way ,even the use of Blu tack to keep spacers in place all can be removed so not to damage the deck
    i had to cheat a little bit over the weight i put a double pulley on the motor and bought some 10mmx10mm x 1mm stainless springs to go under the suspension legs although they do not quite touch the chasse just stuck on with blue tack ,they stop any excessive bounce , which may damage the suspension due to the extra 750grm weight , so far it should kick the orbes bottom as i have had 2 orbes in the past with sme V on ,both never sounded a sweet and as clear as the gyro i have now ,
    Last edited by gwernaffield; 18-06-2017 at 18:42. Reason: spell check

  4. #4
    Join Date: Oct 2008

    Location: Glasgowshire

    Posts: 6,107
    I'm availableforweddingsAndBarmitzvas.

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    Fascinating stuff Peter, have dabbled a lot tweaking my 'Gorbe' deck over the years and you've done stuff I hadn't even thought of!

    Sent you a PM.
    It's good to be aware of the parameters under which a device performs. It's not terribly useful to be scared off by them..


  5. #5
    Join Date: Apr 2015

    Location: Central Virginia

    Posts: 484
    I'm Russell.

    Default

    Fantastic stuff Peter, I am a tinkerer too. DIY can be every bit as effective as store bought, and quite often better. I'd love to see some pictures to help me visualize some of these upgrades you've managed! I'm guessing many of your improvements could work on any 'table, not just a Mitchell.


    Sent from my iPad using Tapatalk

  6. #6
    Join Date: May 2016

    Location: north wales uk

    Posts: 45
    I'm peter.

    Default pictures

    stripped down .jpgtt.jpgP1000843.jpgP1000854.JPGhome made spacer .JPGfor t

    hi i have atteched some pictures , as the odyssey is not a normal deck to begin with , it has the orbe case and a spider , the main part being full of densodamp
    there was not much left to do ,
    so i have made a home made spacer ,which i had machined of a company on ebay that also supplied the material at £18 , it isthe same diameter as the michell arm board with a 85mm hold cut in the centre , by what ever thickness you need, it is held into place by Nylon Cheese head screws 40 to 50 mm long and m5 thread , also the screws that hold the Cartridge on are nylon to save weight,
    i made the damper out of PTFE sheet , less that £3 ,
    there are 3 20mm x 1mm "o"rings on the bottom of the covers for the suspension,
    also some 1.5mm sound damp the same as you use in cars , inside the tubes ,
    the rest was the ball bearings and changed to ceramic ,then to delrin , the to torlon and now PTFE for the main thrust bearing
    3 delryn for the suspension ,

    i later added a very expensive MJ12 Matt and the weight , as i got fed up unscrewing and screwing the clamp on ,i had to put 6 10mm x 10mm x1.5 mm springs under the suspension
    towers to stop any excessive bounce due to the extra weight the TT mat and weight has added ,
    i have since used the sign stand offs to support the rear corners of the case with the deck being a 3 point support the rear is left to do its own thing , i noticed that the corners were sagging and causing the arm to be pulled to that direction so i bought a glass sign standoff , which cost £6 , it acted like a jack and is supporting the corner of the case , but not so much as to lift it off the designed feet ,they are made of aluminum , and come in diffrent sizes and colours ,

    peter
    Last edited by gwernaffield; 18-07-2017 at 10:40. Reason: added more information

  7. #7
    Join Date: Jan 2013

    Location: North East

    Posts: 1,240
    I'm Alan.

    Default

    Excellent post....I'm using a logic DM101 turntable...I've purchased the Delrin balls and the ceramic ones too...I've got a sheet of teflon1.5mm thick...and also ordered the nylon nuts and screws for the cartridge..(Goldring Eroica LX)...I've replaced the main bearing with one of the Delrin Balls...what a difference...very little noise now and all I here is the music...I'm going to cut out a damper for the cart tomorrow and fix the cart on with nylon nuts and screws...it can only get better..Don't think I'll even bother with the ceramic ball bearings.....the Delrin ball is staying where it is....Excellent tweaks Peter..many thanks...

    P.S....anyone with a Logic DM101...the bearing is 6mm..

    I got mine here x5 for £2.40..

    http://www.ebay.co.uk/itm/BEARING-OP...72.m2749.l2649
    Last edited by mad-moon; 23-06-2017 at 16:08.
    'ANSOM IN THE SUMMER..'ORIBBLE IN THE WINTER

    Cambridge Audio stream magic 6, Seagate nas drive, Sony X559ES CD Player, Logic DM101 turntable, Rega RB300 / Goldring Eroica, Denon DAP-2500 digital pre, Denon POA4400A monoblocs, Shanling dac 50, Roksan Darius speakers, Target R1's, Atacama Equinox.

  8. #8
    Join Date: May 2016

    Location: north wales uk

    Posts: 45
    I'm peter.

    Default

    hi the delrin balls are for the suspension towers , the cermic ball is for the main bearing , the size of the balls used are all 7/32 that is the correct size ,not 6mm as they are 2 big according to the michell specs , also cause excess wobble ,I i have attached pictures of every thing i bought of eBay ,
    cheers
    ptfe and o rings .JPGball bearings .jpgcartridge bolts.JPGdelrin spacer and nylon bolts .JPG
    Last edited by gwernaffield; 23-06-2017 at 21:33.

  9. #9
    Join Date: Apr 2015

    Location: Central Virginia

    Posts: 484
    I'm Russell.

    Default

    Great stuff! Such a sense of accomplishment when your mods pay off! Now I'm searching my 'table for anything I can try a nylon screw on!


    Sent from my iPad using Tapatalk

  10. #10
    Join Date: May 2016

    Location: north wales uk

    Posts: 45
    I'm peter.

    Default

    yep i could not Believe
    The difference they made , also the ptfe- Teflon damper for the cartridge I used 1.5mm as this can be cut with a pair of scissors , and then drilled using an old head shell as a template , and then cut out to fit ,you can buy one at £20 which is 3mm thick ,but I found the 1.5mm works for me
    the only problem i found was the head on the Nylon screws are Bigger, so to make them smaller i put them into a drill and used a file to make them smaller, the Nylon is tough , i kept the Nuts for the cartridge as they are smaller then the nylon ones ,but used the washers so they do not touch the head shell, or arm ,
    if you want to try a delrin ball in the main bearing ,keep an eye on it to make sure that there are no changes in size or shape, Delrin is used for making all kinds of stuff including gears also delrin balls are grade one the highest grade you can get for roundness and smoothness, the ceramic balls are grade 5 , the steel balls are normaly grade 10 , unless it is aspecial order and 4 times the cost of grade 10 ,
    i found the white ceramic better than the black one, the black ones can be bought off ebay under the cycling section as they are used for race cycles , the white type are imported from china , and are used in diffrent applications , and can be run dry ,but i would not reccomend that , and i would no longer reccomend ceramic as i was told they can get micro cracks and have removed them out of my system
    please note i have put this up in good faith and will not beheld responsible for any damage you do to your deck ,just the improvements they will bring ,i am going to try the Delrin Ball in the MIchell , and report back in a month's time ,
    keep smiling every day even if some one upsets you

    Torlon is used in the following
    •Chemical Resistant
    •Creep Resistant
    •Ductile
    •Fatigue Resistant
    •Flame Retardant
    •Good Electrical Properties
    •High Heat Resistance
    •High Temperature Strength
    •Low Temperature Toughness
    •Ultra High Impact Resistance
    •Wear Resistant
    Uses
    •Aircraft Applications
    •Automotive Applications
    •Bushings
    Connectors
    Electrical Parts
    •Electrical/Electronic Applications
    •Fasteners
    •Film
    •Machine/Mechanical Parts
    •Oil/Gas Applications
    •Semiconductor Molding Compounds
    •Thrust Washer
    RoHS Compliance
    •RoHS Compliant
    these are High Grade Bearing balls that are with in a tolerance of .002 mm they contain PTFE but the PTFE ones are 100% ptfe and are the same grade as the Torlon and Delrin ,
    Last edited by gwernaffield; 24-07-2017 at 14:11. Reason: added more information

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