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Rega RB110 tonearm vertical bearings torque specs

Discussion in 'audio' started by vicdiaz, May 14, 2019.

  1. vicdiaz

    vicdiaz Just another analog freak...

    Hi,

    I'm rewiring a Rega RB110 tonearm and need information on torque specs for vertical bearings.
     
  2. pocketkitchen

    pocketkitchen Registered User

    Have you dismantled it? You should be able to pull the new cabling through using the old as a guide. If you've dismantled it, I'm not sure where you'll get the specs from as Rega don't publish them.
     
  3. vicdiaz

    vicdiaz Just another analog freak...

    The old wiring was damaged and could not use it to pull thru the new wiring loom.
     
    Last edited: May 14, 2019
  4. Craig B

    Craig B Re:trophile

    Rega have reported that the same team produce 125 complete Planar 1 units per day. IOW, they assemble 125 RB110 tonearms and 125 decks!
    As such, I would suspect that the assembly process for RB110 is geared toward speed, with zero play rather than ultra-specific pre-load as ultimate goal.
     
    vicdiaz likes this.
  5. pocketkitchen

    pocketkitchen Registered User

    The tonearm dept is separate to the turntable one but I can't imagine them not doing it to a certain spec. If they don't then it won't matter but if they do, then I can't imagine they'll publish the numbers anyway. Maybe drop them a line and ask if they can repair it?
     
    Joolzdee likes this.
  6. Joolzdee

    Joolzdee pfm Member


    +1 for this.
    Can't see Rega charging an arm (no pun intended!) and a leg to re-wire it either.
     
  7. stevec67

    stevec67 pfm Member

    Can you do it by feel the way you do with bike wheels, car wheel bearings, etc?
     
  8. Craig B

    Craig B Re:trophile

    I suspect they are separate for the rest of the turntable line, however, due to demand, this is not the case with Planar1/RB110.
    http://www.rega.co.uk/rega-factory-tour.html
     
    Last edited: May 14, 2019
  9. Craig B

    Craig B Re:trophile

    [​IMG]
     
    Last edited: May 14, 2019
  10. pocketkitchen

    pocketkitchen Registered User

    Fair enough. If the arm has a fault, my feeling would be to send it back to them and get it returned to spec, though.
     
  11. Craig B

    Craig B Re:trophile

    Agreed, however, our Vic lives in beautiful Trujillo Alto, PR. and may, in fact, have the bearing of the local hi-fi guru.
     
    vicdiaz likes this.
  12. Mr Pig

    Mr Pig ^'- -'^

    I would be very surprised if there was a torque for the RB110, or any other Rega arm for that matter. It's one of those things where feel is the best tool for the job. If you get the arm so there is no play in the bearings but it's floating as freely as it does with play, you can't get any better than that. It's not very difficult.
     
    Durmbo likes this.
  13. Craig B

    Craig B Re:trophile

    Ring the bell in post #9 above, and advance to the tonearm department.
     
    pocketkitchen likes this.
  14. vicdiaz

    vicdiaz Just another analog freak...

    Fair enough, I will go for no play on bearings then.
     
  15. Craig B

    Craig B Re:trophile

    Here is the closest thing Rega has published on their site that indicates the amount of preload applied to their tonearm bearings.

    Below is a photo of one of Rega's vertical bearing adjustment jigs being demonstrated to visitors from The Absolute Sound, circa 2013. Note the dial indicator used to set microns of travel past initial contact, aka preload. I suspect that the technique involves gently making contact with the bearings by feel, setting the dial indicator to zero, and then turning through an additional specified fraction to whole micron (or two) of travel via reference to the gauge as a means to eliminate radial play.

    [​IMG]
    Compare the above micron tolerances with that mentioned in the Rega 'The Importance of Zero Play' missive and one might assume ~2 microns for RB110.

    Here is a illustration of the dynamics of applying preload, in this case, the application of an axial load across a pair of bearings for the purpose of removing free internal clearances.

    [​IMG]
     
    Last edited: May 15, 2019 at 2:54 PM
    vicdiaz likes this.
  16. Durmbo

    Durmbo Not French

    I've done exactly this with an RB300 that came with slightly playful bearings. Sounded so much better afterwards.
     
  17. Mr Pig

    Mr Pig ^'- -'^

    The only Rega arms I've seen play in was the Goldring-badged RB250. I reckon it was deliberate.
     
  18. Craig B

    Craig B Re:trophile

    Same here with an NAD-badged one. I doubt it to be 'deliberate', more a case of it being better to err on the side of slightly loose than seized when turning out thousands by next Friday.
     
    Last edited: May 15, 2019 at 2:16 PM
  19. Mr Pig

    Mr Pig ^'- -'^

    The NAD ones I've seen looked to be exactly the same as Rega-badged ones. All of the arms seem to be the same with the exception of Goldring. The bearings on those were so far out I have to conclude it was deliberate to reduce the performance of the arm. Even then, once you adjusted the bearings they were fine, same as any other RB250.
     
  20. stevec67

    stevec67 pfm Member

    Mr Pig, it was you who bought the Goldring arm from me wasn't it, the one that needed a rewire? If so I remember you commenting that the bearings seemed a little loose compared to a "proper" Rega-badged item and you had to adjust them. It would make sense that Rega "detuned" them slightly, certainly the rest of the deck was slightly less nice than a Rega 2, which fitted with it being a bit cheaper.
     

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