+ Reply to Thread
Results 1 to 16 of 16

Thread: Tonearm for BigBoy II

  1. #1
    Join Date
    Oct 2007
    Location
    Lancashire.
    Posts
    4,134
    Blog Entries
    1
    Rep Power
    324039

    Default Tonearm for BigBoy II

    I felt good this morning so I decided to tackle the tonearm for BigBoy II, something I've been putting off for quite a while. BigBoy II is another Lenco turntable I built for myself after having built one for Gary. Mine has my SME 3012 mounted on it but someone has expressed an interest in the turntable but doesn't want the 3012.



    The chap has asked for a modified Jelco like the one I built for Gary but after borrowing my Lenco he also wants it adjustable ie on a sliding bed. So the fun begins. I had another old LAD tonearm ( built by Jelco) which had seen better days so I stripped it down into its component parts and spent some time cleaning them whilst I decided how I was going to do this. The first thing was to acquire an SME bedplate and I bought one for the SME III, the one with the titanium armtube. I like these bedplates because they'te better made than the earlier ones, they have a ptfe liner so they slide nicely and they clamp the arm pillar with a long bolt which is just so much easier. There's no SME label either.



    One issue with this plate is that the slider is only clamped with one bolt on one side. the other side is used for the bias. I ditched that but couldn't get another nut and bolt so I made a pair from two M4s. I'm using chrome dome nuts and I think they look ok.



    Here they are fitted,





    The next step was to match the arm pillar to the bedplate. There's a bit of difference in diameter between the two so I machined a sleeve out of aluminium to take up the slack,





    I've machined a brass plug for the bottom of the tube for the arm wires to exit. I much prefer my arms to have fixed wiring.



    So that's it for today, more later
    Si.

  2. #2
    Join Date
    May 2007
    Location
    Glasgow
    Posts
    7,897
    Rep Power
    209992

    Default

    Excellent Si. Great work.

  3. #3
    Join Date
    Jun 2007
    Location
    Birmingham
    Posts
    11,023
    Rep Power
    1792658

    Default

    The sliding arm could be useful. Nicely thought out and made as per usual. Is the guy local been as he borrowed the tt?

    I was stewarding an exhibition today at the local art centre (mac). The current exhibits would appeal to you Si, he's a designer/crafstman who pays homage to the old crafts by building mobile work stations that can be used to make goods anywhere and by collecting and recycling locally found materials. In his video that accompanies the exhibition, he talks about all the skilled people that work in their sheds and homes up and down the country. http://www.willshannon.co.uk/

  4. #4
    Join Date
    Oct 2007
    Location
    Lancashire.
    Posts
    4,134
    Blog Entries
    1
    Rep Power
    324039

    Default

    The chap lives near Stafford Gary. I've known him a long time. Come to think of it he's nearer to you than me. He'll be coming over next week to pick his preamp up and inspect the work so far

    Stewarding a show aye Gary. That sounds interesting. We're you exhibiting any stuff? Found that Will Shannon website quite interesting too.
    Si.

  5. #5
    Join Date
    Jun 2007
    Location
    Birmingham
    Posts
    11,023
    Rep Power
    1792658

    Default

    No Si, my work will be on show at the Rugby School next month and then in Hinckley. Anyway, enough about me, get on with the arm.

  6. #6
    Join Date
    Oct 2007
    Location
    Lancashire.
    Posts
    4,134
    Blog Entries
    1
    Rep Power
    324039

    Default

    After a long lay off I managed to get a bit done to the tonearm. I made a new counterweight out of brass but decided to turn down the original counterweight and make it into an insert which is then glued and pressed into the new brass counterweight. It's too heavy at this stage but I'll machine it down when the arm's finally assembled.





    I decided to spray paint the metal parts of the arm as they're made of something unsuitable for anodising. These parts show the workings of the lower bearing and anti skate. The aluminium sleeve is glued and pressed onto the original arm pillar,



    A couple of pics of the arm assembled to make sure it all goes back together ok before wiring and final assembly.





    Just the headshell to finish and we should be good to go.
    Si.

  7. #7
    Join Date
    Jun 2007
    Location
    Birmingham
    Posts
    11,023
    Rep Power
    1792658

    Default

    looking good Si. Do you think you'll experiment with some damping oil in the reservoir? I didn't detect any difference with mine.

  8. #8
    Join Date
    Oct 2007
    Location
    Lancashire.
    Posts
    4,134
    Blog Entries
    1
    Rep Power
    324039

    Default

    I will try some silicone oil Gary. After the result you had I'm going to try some Michell oil. It's thick like treacle and will pretty much damp anything. It might be too thick but it'll be a good starting point.
    Si.

  9. #9
    Join Date
    Jun 2007
    Location
    Birmingham
    Posts
    11,023
    Rep Power
    1792658

    Default

    I have the bottle here to show you when you visit. Actually I'd forgotten all about it and didn't do much experimenting with it tbh. I think it's still in there.

    It's really good news to hear you are so active again. I hope problems don't return, you've had your share I would have thought.
    Last edited by TIU; 22nd May 2015 at 20:35.

  10. #10
    Join Date
    Oct 2007
    Location
    Lancashire.
    Posts
    4,134
    Blog Entries
    1
    Rep Power
    324039

    Default

    Thanks Gary. I seem to have gone from bedridden to hyper active in a week. I spent this afternoon with an industrial machine designer and I start work for him next week. It all looks very interesting and I think I'm going to enjoy getting back to work.
    Si.

  11. #11
    Join Date
    Jun 2007
    Location
    Birmingham
    Posts
    11,023
    Rep Power
    1792658

    Default

    So that is different to the short-term light fitting work you mentioned? Great news!

  12. #12
    Join Date
    Oct 2007
    Location
    Lancashire.
    Posts
    4,134
    Blog Entries
    1
    Rep Power
    324039

    Default

    Aye just a bit. The light fittings are for the same company. Things just escalated slightly lol but I've told them I'm semi retired now and I'm only willing to work two or three days a week. That seems to suit them fine as they don't have enough work to take someone on full time.....yet
    Si.

  13. #13
    Join Date
    Apr 2008
    Location
    Birmingham, , United Kingdom
    Posts
    364
    Rep Power
    272501

    Default

    Glad to see this moving again. I loved the example on Gary's deck.

  14. #14
    Join Date
    Oct 2007
    Location
    Lancashire.
    Posts
    4,134
    Blog Entries
    1
    Rep Power
    324039

    Default

    Thanks Henry. I'm just glad to be back on my feet again and able to carry on where I left off. I decided to get stuck into my lad's amps this morning as they've been here well over six months so the headshell is on tomorrows agenda.
    Gary's arm was done on a tight budget of more or less zero. I just used what I had lying around and I was more than happy with the result
    Si.

  15. #15
    Join Date
    May 2007
    Location
    scotland, , United Kingdom
    Posts
    5,809
    Blog Entries
    1
    Rep Power
    351395

    Default

    nice work there Si !!
    www.audioorigami.co.uk

    And visit my face book page--- check out Audio Origami

    http://www.facebook.com/AudioOrigamiTonearms

  16. #16
    Join Date
    Oct 2007
    Location
    Lancashire.
    Posts
    4,134
    Blog Entries
    1
    Rep Power
    324039

    Default

    Thank you kindly John. No state of the art jobbie I'm afraid but it'll sound nice and make someone happy
    Si.

+ Reply to Thread

Posting Permissions

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