First crack at a brass fret model!

Discussion in 'Workshop Benches' started by Keith M, Jul 27, 2017.

  1. Keith M

    Keith M Staff Member Moderator

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    So I received the 'Jidenco' 15/20 ton S.R. ballast wagon kit today.....time to dive in and 'fill me boots' (perhaps with concrete, judging by Jidenco's reputation!), so here goes. This is the kit as received.

    Attached files [​IMG]
     
  2. Keith M

    Keith M Staff Member Moderator

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    ......and the 'instructions'! About as rudimentary as the MTK white metal models instructions!

    Attached files [​IMG]
     
  3. Keith M

    Keith M Staff Member Moderator

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    So first I cut the wagon inner base/sides part out, cleaned up the attaching tabs, and 5 minutes with the 'Hold 'n Fold' produced the wagon inner, to which the outers solder separately. Don't know if this is how other wagon kits are done, but this is the 'Jidenco' method. I'm using a phosphoric acid flux, so fluxed and soldered the four corners, then clean them up with a fine file thus. At the same time, I cut out the four outer sides and cleaned up the tabs ready for tinning.

    Attached files [​IMG]
     
  4. Keith M

    Keith M Staff Member Moderator

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    Next step was to tin around the edges of the four outer sides and do likewise to the outside sides of the inner box like this. I am finding that there is not quite enough heat from the soldering iron to properly melt the solder neatly, so I'm going to break out the blowtorch for this next job. Although I'm an Electrician by trade, in my working lifetime, I've done quite a lot of plumbing work including sweating immersion heater flanges into copper cylinders, so using a blowtorch is nothing new to me. Here are the parts ready tinned for assembly, this will likely be tomorrows job now.

    Attached files [​IMG]
     
  5. Toto

    Toto I'm best ignored Staff Member Founder Administrator

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    Hi Keith,
    there is nothing wrong with that kit from where I'm standing. I think I would have given it a good overall scrub before I started rather than just cleaning the bits that will receive solder as it looks like its been lying for a while. Apart from that, it looks good.
    When you soldered the corners, could you not have soldered up the inside seam ?
    toto
     
  6. Toto

    Toto I'm best ignored Staff Member Founder Administrator

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    I think I jumped in there too quick Keith. I have just noticed that it appears to be a laminate of two layers to all the sides. Thats a little different. It will certainly be strong and heavy. :thumbs:
     
  7. jakesdad13

    jakesdad13 Staff Member Moderator

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    From what I could see it appears fairly simple though to build the 15 ton version it looks like it would need the top planks removing, not an easy job I imagine. What wattage iron are you using Keith?

    Cheer's, Pete.
     
  8. Toto

    Toto I'm best ignored Staff Member Founder Administrator

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    It's got some nice planking detail and the iron work is riveted. It'll look the part once it's finished and cleaned up a bit.:thumbs:

    I'll follow along as I have finally taken the plunge myself and could maybe pick up some soldering tips. Looking forward to the next part of your build Keith. :thumbs:
     
  9. SMR CHRIS

    SMR CHRIS Staff Member Moderator

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    Hi Keith looks like one of the later kits that's a good thing will make a nice model.
    It's often worth pickling the older frets for a bit and give a scrub and a wash after to get that nice shiny look back
    Re the Iron yes looks like it's not transferring enough heat by the way the solder has bonded, it looks like it hasn't flowed onto the brass
    A small tip on the iron won't transfer the heat effectively as well as a nice broad tip.
    However in the situation with sweating the sides to the body you will need the blow torch as the body will act as one big heat sink suggest you do a bit of pre warming to the body to aid in the final heat transfer and also give the parts a final scrub before with a little liquid flux and a old brush to get a nice fresh surface with out oxidation and the solder will flow nicely.

    Great start best of luck with the next step :thumbs::thumbs::thumbs:
     
  10. Keith M

    Keith M Staff Member Moderator

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    Had a late start to the project today as I've been out walking in the Peak district, followed by a pub lunch. (I'm teetotal, so still got a fairly steady hand!). Anyway, down to business. First job was to flux the outside of the inner panels, then the inside of the outer panels, drop into place in turn, and gentle heat with the blowtorch resulted in this below.

    Attached files [​IMG]
     
  11. Keith M

    Keith M Staff Member Moderator

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    .....and from the underside.

    Attached files [​IMG]
     
  12. SMR CHRIS

    SMR CHRIS Staff Member Moderator

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    It will be nice and solid now :thumbup:
     
  13. Keith M

    Keith M Staff Member Moderator

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    It wasn't difficult to achieve a good solid set of side and end panels in this way, so next job was to bend up the side channels using the 'Hold 'n Fold', clean, flux and tin one edge of each, clean flux and tin the area of the body underside where these were going to be soldered onto, then again with the blowtorch, warm gently and all is bonded together thus.

    Attached files [​IMG]
     
  14. Keith M

    Keith M Staff Member Moderator

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    Next it's the turn of the buffer beams to be fitted. These needed some opening out of the holes for the buffers, then I cleaned, fluxed and tinned each end of the beam inners and each end of the side channels, placed the beam in position with a little heat and application of solder. The other end was done in the same way, then holding the body on end in the vice (gently!), clean, flux and tinned the area where each buffer was going to fit, and each buffer, dropped into place, a little heat again, and all done. So now things look like this.

    Attached files [​IMG]
     
  15. Keith M

    Keith M Staff Member Moderator

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    Next, it's the turn of the side frames and axleboxes, so having bent each side frame to 90 degrees, I decided that rather than use the plain holes predrilled for the wheels, I would use some 'Top Hat' pinpoint bearings, so opened out the holes, then soldered in the bearings from the inside, opening out the white metal axlebox castings slightly to fit over the outside of each bearing. Having done that, it was time to solder the side frames into position, so the usual clean, flux and tin, then gentle heat from the blowtorch, and all done as below. Axlebox castings were fixed using superglue, quick and simple.

    Attached files [​IMG]
     
  16. Keith M

    Keith M Staff Member Moderator

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    Rooting about in my bits box, I came across a pair of rather tarnished (ex lima I think!) wheelsets of the correct diameter, so dropped these in for a trial fit......all seems ok so far.

    Attached files [​IMG]
     
  17. Keith M

    Keith M Staff Member Moderator

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    ....and trying it the right way up to make sure the wheels are level. (Also tried it on the rails).....:thumbup:

    Attached files [​IMG]
     
  18. Keith M

    Keith M Staff Member Moderator

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    I know that assembling a brass fret model mainly using a blowtorch is not everyones idea of the way forward, but all I'll say is that I've found it much easier and somewhat quicker to solder parts together, and no problems with cold joints. Obviously, you must be very careful in controlling the heat, a touch too much, and you'll have brass bits all over the floor, so not recommended unless like myself you've had a lot of experience with a blowtorch. Fortunately, when I did my trade training in the early 60's, there were no such things as 'crimp lugs' for cable ends, so we were taught to solder it with the blowtorch, and I still think it's the best way to do it. Hopefully, I'll be able to make further progress on this model tomorrow.
    Keith.
     
  19. Toto

    Toto I'm best ignored Staff Member Founder Administrator

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    Certainly solid Keith.:thumbs:
     
  20. Toto

    Toto I'm best ignored Staff Member Founder Administrator

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    Just out of curiosity ...... what wattage was the soldering iron that you started off using ?
    toto
     

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