Class 27 From kit to completion.

Discussion in 'Workshop Benches' started by York Paul, Jan 8, 2019.

  1. York Paul

    York Paul Staff Member Moderator

    Messages:
    5,816
    Likes Received:
    6,870
    Joined:
    Aug 20, 2017
    So this evenings little jaunt in the workshop resulted in the the construction of the body skeleton as described in Section 3 of the instructions, this "cue jump" of the making process is because by fabricating this unit on my marble flatstone I need to check for "flatness" on both the mainframe and skeleton units because both these will sit together held in place by four screws and nuts. So starting with the base frame I added the corner posts checking for a perpendicular fit, there are eight of these and one U shaped cross brace, once the outer posts were soldered I then offered the upper skeletal section which carries the arced roof braces for soldering too. Working this way it is quite possible to "police" the build for distortion and correct any mis alignments because effectively you have constructed a box frame, next add in the two middle pairs of upright posts and they will locate nicely into the slots on the upper and lower skeletal frames. Easy peasy see and that is your proof the whole unit is now correctly assembled nice and straight. Finally I added the seven arced roof formers by holding each upright against a square block of wood, fit the two outer ones first and then work inwards towards the centre because simply it is easier to do it this way. So that's it for now with this unit until the chassis mainframe is finished, then, I'll solder the four holding down nuts when I prove everything else is flat. At this point tomorrow I will describe my method of fixing in the tiny Part 2 and 3 braces as discussed in yesterdays post when I have completed some filing work but for now I am still opening the slots out since they are somewhat too narrow to work with.


     
    Last edited: Jan 15, 2019
  2. Toto

    Toto I'm best ignored Staff Member Founder Administrator

    Messages:
    15,419
    Likes Received:
    3,842
    Joined:
    Dec 5, 2017
    Nice work Yorkie. You are making light work of that. :tophat:
     
  3. York Paul

    York Paul Staff Member Moderator

    Messages:
    5,816
    Likes Received:
    6,870
    Joined:
    Aug 20, 2017
    Cheers Toto, much of this work is straight forward and the most intense aspect by far is the proper fitting of the Part 2 and 3 items so the mainframe isn't compromised through heat distortion.
     
  4. York Paul

    York Paul Staff Member Moderator

    Messages:
    5,816
    Likes Received:
    6,870
    Joined:
    Aug 20, 2017
    Today's postie drop included these little suckers... twenty four inches of Delrin chain and eight cogs with ten teeth and a 3/16" axle bore for the Class 27 and for the Class 25.


    I have to admit I only found this particular supplier three days ago and his price knocks the spots off all the others, he is also an authorised Delrin supplier with a massive stock of different components for use with robotics and radio control. I've just checked the product spec and its identical to all my previous Delrin purchases, Gentlemen I think we are being taken as mugs since this new chap must be the UK wholesaler, his price... wait for it...

    £26 including 1st class P+P on a two day turn around !

    My last Delrin purchase for 4 cogs and 10 inches of chain was £25... if only I'd known beforehand :hammer::facepalm:
     
    SBt and Andy_Sollis like this.
  5. Timbersurf

    Timbersurf

    Messages:
    720
    Likes Received:
    436
    Joined:
    Jun 20, 2018
    I thought I had enquired of you what delrin was before and you had given me a link to this supplier, but obviously not, if you have just found it, is this the same one (equal to your prices)
     
    York Paul likes this.
  6. York Paul

    York Paul Staff Member Moderator

    Messages:
    5,816
    Likes Received:
    6,870
    Joined:
    Aug 20, 2017
    We have chatted about the uses of Delrin... not certain I've sent you that link Timber, however the chap is not a million miles away from you over in Gwyneth.
     
    Timbersurf likes this.
  7. York Paul

    York Paul Staff Member Moderator

    Messages:
    5,816
    Likes Received:
    6,870
    Joined:
    Aug 20, 2017
    Well thank goodness the most repetitive part of this kit build has been completed now, this was the fixing of forty four tiny strengthener pieces which run down the length of the mainframe ... twenty two on each side. Now I still have six pairs of the even smaller Part 3 to laminate and fit, these will sit as pairs one on each inner end on the bogie stretcher brace so that's four in total, then the other two are located on each side in the middle between the fuel tank and water tank carrier beams. This whole process when completed requires the fitting of no less than fifty laminated units, the outer detailing strip Part 25 as shewn in Fig 1.3 of the instructions is going to be glued in place as I don't see how this can be successfully sweated in with heat. Now a few days ago I said I was going to describe my own method of fixing this main frame detail so this is what I decided to do, so I opened out the depth of all fifty notches on Parts 26 using a fine needle file, this was neccessary because the notches were just making a too tight fit and my eyesight and patience was being tested to the limit :avatar:, I then soldered the Parts 26 into place taking care to avoid flooding the notches, starting at the buffer end I worked my way along tack soldering this piece into position, next it was a case of just feeding the Parts 2 into the notches from inside the frame lining each up individually and soldering into position. As I worked along the channel solder filled the gaps creating a solid union for all the parts, remember to do this on a flat stone to avoid twisting and distortion, I used my ... yes folks you guessed it ... my trusty marble flatstone.


    Now this afternoons work will be to fabricate Parts 18 and 21 together to make a pair of buffer strengthener beams and solder these into place and solder the holding down nuts on the skeleton frame, I shall then make a start on fabricating the tiny tank carrier brackets and continue making up the sub assemblies as shewn in Step 1 of the instructions, hopefully this will conclude construction of Step 1, 2 and 3 of this build. Next job after this will be to build up the bogies and fit the motors.

     
  8. SBt

    SBt Full Member

    Messages:
    259
    Likes Received:
    288
    Joined:
    Jul 3, 2018
    Geat work!

    The issue here is the width of those tiny supports. They are 2" or 50mm wide which is a scale of 1.16mm and are too small to cast. Laminating two 18thou' parts together is just about the right width.
     
    York Paul likes this.
  9. York Paul

    York Paul Staff Member Moderator

    Messages:
    5,816
    Likes Received:
    6,870
    Joined:
    Aug 20, 2017
    Yes I guessed that Steve but they will look good with a smidge of Green putty on the ends once the main frame is primed. As you mention these bits are quite small and too fiddly to dress with solder so I'll attend to the aesthetics later on. Now whilst you are here could you tell me where Parts 10 and 11 from Figure 1.4 go please? Also any chance you can send me a set of straight cab steps as I cannot find pictures of a 27 with the angled ones which were fitted to 26's, also another pair of sliding cab window etches as well... let me know the price and I'll BACs you for these. Ta muchly.
     
    Last edited: Jan 20, 2019
  10. Toto

    Toto I'm best ignored Staff Member Founder Administrator

    Messages:
    15,419
    Likes Received:
    3,842
    Joined:
    Dec 5, 2017
    What do all these tiny pieces actually achieve ? Do they have a purpose, can they be seen on the finished product ?
     
  11. SBt

    SBt Full Member

    Messages:
    259
    Likes Received:
    288
    Joined:
    Jul 3, 2018
    Oops - well spotted paul - as ringed on pic below.

    The angles pieces, yes they do stand out. When I get my new printer I may be able to create that whole section in one. I don't yet know.

    Credit to whoever took the pic. I found it on a web site. 20170527_200316_001-XL.jpg
     
    Andy_Sollis and York Paul like this.
  12. Toto

    Toto I'm best ignored Staff Member Founder Administrator

    Messages:
    15,419
    Likes Received:
    3,842
    Joined:
    Dec 5, 2017
    Yes, very clearly.
     
  13. SBt

    SBt Full Member

    Messages:
    259
    Likes Received:
    288
    Joined:
    Jul 3, 2018
    Oh yes the steps are part of an upgrade etch I'm tagging onto the Cl 108 underframe design. So I can send those out to everyone FOC and include it in the main kit once it's formally released to the general moddelling comunity, (At £285.00).
     
  14. York Paul

    York Paul Staff Member Moderator

    Messages:
    5,816
    Likes Received:
    6,870
    Joined:
    Aug 20, 2017
    As much as these Type 2 Sulzers are my favourite design locos by far I can't help but think they are the railway equivalent to a Morris Marina or Austin Allegro... rot out through the door pillars, floor sills and leak in through the windshields.:avatar:
     
  15. SBt

    SBt Full Member

    Messages:
    259
    Likes Received:
    288
    Joined:
    Jul 3, 2018
    I'd say they were better designed, (Mt first car was a Marina) but I agree the build quality was equally as suspect. Sadly these were the dark days of UK manufacturing ruined by strikes and unrest. A price we're paying to this day.
     
    York Paul likes this.
  16. York Paul

    York Paul Staff Member Moderator

    Messages:
    5,816
    Likes Received:
    6,870
    Joined:
    Aug 20, 2017
    Now then this picture shows the buffer strengthener plates fitted, I've posted this up to show how excess over-solder from previous joints can be used to good advantage. This particular strengthener sits tucked in behind the front buffer beam which also continues the channel work around the mainframe base, so some solder will leak at the joint and potentially prevent these strengtheners from sitting in their correct alignments behind the beam unit. This is not a problem because when fluxing for the strengthener to couple to this excess solder will under gentle heat work its way along the new joint forming a solid connection, a bit like pre-tinning and with a gentle nudge from the hot iron bit the new piece will glide into place as the flux fizzes away. Remember not to overwork the heat and always have a heat sink on standby, all these connections I make generally only use 145 degree solder and I rarely have fabrications collapsing on me through overheat. :thumbup:

     
    Rob Pulham, Keith M, SBt and 2 others like this.
  17. mydadstoys

    mydadstoys Full Member

    Messages:
    224
    Likes Received:
    170
    Joined:
    Dec 5, 2018
    Paul I’m enjoying watching your build thread. My :tophat:goes off to anyone who builds from etched kit. Can’t wait for your next updates.:thumbs:
     
    York Paul likes this.
  18. York Paul

    York Paul Staff Member Moderator

    Messages:
    5,816
    Likes Received:
    6,870
    Joined:
    Aug 20, 2017
    Thanks Kevin for that nice comment and I'm happy you are enjoying this thread because I often worry this kind of detail isn't everyone's cup of tea, just to bring you up to speed (if you didn't already have the heads up on this) is that Steve has brough out a new diesel kit and I'm road testing the build, Paul_l aka Dundee Paul is working with Andy Sollis researching new 3D printing techniques so we can offer Steve the very best components to compliment this kit before it goes on general release... so the pressure is on so to speak and as they say you saw it first on Platform 1. So priority one is to get this one up and finished and painted... I might as well make a nice wooden box for this lovely loco to go in as well while I'm at it :avatar:

    Now just a quick update on this... I've soldered the four 8BA body to chassis holding down nuts in place and align they do nicely, so I'm finishing off making up and installing the six little Part 3 items as discussed and then I'll be on with the bogie build... ordered the wheelsets from Slaters so they'll be here on Wednesday... its all systems go at this end now. So Steve hurry up if you will with those STL files for Dundee so he can print them please I need high definition detail brake cylinders and sand boxes mate on this engine and the next one too :thumbs: if we are going for a 10 out of 10 result ta mate.:tophat:
     
    Last edited: Jan 20, 2019
    Andy_Sollis likes this.
  19. mydadstoys

    mydadstoys Full Member

    Messages:
    224
    Likes Received:
    170
    Joined:
    Dec 5, 2018
    :hismiley:Paul it’s great that fellow modellers are working together to produce the best diesel kit with detailed components.:tophat:
     
    Keith M, York Paul and Andy_Sollis like this.
  20. York Paul

    York Paul Staff Member Moderator

    Messages:
    5,816
    Likes Received:
    6,870
    Joined:
    Aug 20, 2017
    In the picture Steve has provided this evening the ringed object represents the piece I've just made, in the kit this consists of a flat base Part 10 and two tiny triangular pieces Part 11... now this is beyond tricky I must say when it comes to soldering into place... this is what I did. Leaving the base on the etch fret I then cut Part 11 away but leaving some fret on to act as a handle, this is the only way to solder these without tears... cut each piece clean off from the fret and you can say good night because they are just so small. Anyway a quick in out with the iron once the base is tinned and it can be done. Now a message to Steve... it may be prudent to reform the wirework so that Part 11 come as a pair held together with a section of half etch, this way it can be bent to shape and the pair can be soldered to Part 10 aligned properly and the surplus fret removed after. Just a thought :thumbs: so as to avoid upset from purchasers who we don't want to disappoint or frustrate. Anyway I can assure folks here that the other three of these will be made spanned out over the next few days... namely because I want to avoid becoming cross eyed. :avatar: Usual rules apply when made... put the items away safely in a sealed clear bag to avoid loss.

    This is what I mean by leaving on some fret.


    And here is the result... compare scale size with the one penny coin.

     
    Last edited: Jan 20, 2019

Share This Page