Highland Railway Drummond 0-4-4T Passenger Tank

Discussion in 'Kits, Kit bashes & Scratch builds' started by paul_l, Jan 11, 2019.

  1. Walkingthedog

    Walkingthedog Full Member

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    Thanks Paul.
     
  2. gormo

    gormo Staff Member Administrator

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    You`re nearly there Paul........perfection is just a fraction of a millimeter away....:thumbs::thumbs::thumbs::thumbs::thumbs:
    :tophat:Gormo
     
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  3. paul_l

    paul_l Staff Member Administrator

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    Added the missing handrail hole and set up for 45 degrees, estimated print time from the software is 9h27m, so I would guess the real time would be approx 15 to 16 hours.

    Of course one of the big plusses of DLP (Digital Light Processing) 3D printing is unlike FDM (Fused deposition - extruded filament) or SLA (Stereolithography - laser cured resin) which trace the outline of each layer, DLP uses an LCD screen as a mask so can do a shole layer at a time, so providing you can fit multle models on the build plate they will take the same time as one model to print, therefore if multiple models were required it would take the same time as one and would look like this

    upload_2021-1-27_0-25-47.png

    It would also use over 300ml of a bottle of resin, and would need the bath topping up at least once maybe twice during the print process.

    Think i'll stick to one model at a time :whatever:.

    Also note by inclining the model the other way, the amount of supports on the top surface is far less

    upload_2021-1-27_0-40-42.png

    [​IMG]

    We'll see the difference when I do the final print, i'll concentrate on the rest of the bits first

    Paul
     
  4. redpiperbob

    redpiperbob Full Member

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    That looks great Paul now for the 00 gauge version :scratchchin: :scratchchin:
    Bob
     
  5. gormo

    gormo Staff Member Administrator

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    I guess in my case Paul, I would go with NBI ( No Blinkin Idea ) method because I have never heard of DLP, FDM or SLA methods....But obviously you`re on top of the technology and making progress at a great rate.
    Looking forward to the final model turning out well.......:thumbs::thumbs::thumbs::thumbs::thumbs:
    :tophat:Gormo
     
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  6. jakesdad13

    jakesdad13 Staff Member Moderator

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    I'm with Gormo, I haven't a clue of what you are doing but, I do know I like it! Once you've got the print down pat, will you make more for others? For certain I would like one, I have no use on my layouts but I just love quirky locos!

    Cheers, Pete.
     
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  7. paul_l

    paul_l Staff Member Administrator

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    Now now gents, it's simples, just think of DLP resin printers as a mobile phone screen with a vat of resin sitting ontop, hence the first DLP resin printers used a 5" phone screen, then got a bit bigger by using 8, 9, 10 & 12 inch screens, but to get a decent resolution needed the 4K screens to become available at a decent price. There is such a demand for 3D printers that the printer companies have got the manufacturers to make Mono screens which are sharper and as they only have 1 layer (B/W) against 3 layers (RGB) of a standard screen they let more light through so are approx 3 times faster.

    OK smokebox door

    upload_2021-1-27_17-44-54.png

    and then the handles

    upload_2021-1-27_17-46-0.png

    I will try a print with both the handle fitted and separate.

    Paul
     
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  8. gormo

    gormo Staff Member Administrator

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    Oh yeah.......I was wondering when they would get around to the mono screens.....:whatever::facepalm::avatar::avatar:
    :tophat:sorry Paul......I`ll go away and bother somebody else now.....:avatar::avatar:
     
  9. paul_l

    paul_l Staff Member Administrator

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    :avatar:

    I was more shocked to learn that TV's have dumped monochrome and gone to colour - why, most the movies I watch are still in B&W, is my colour TV faulty :avatar:

    Paul
     
  10. paul_l

    paul_l Staff Member Administrator

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    Imported the roof and thought I'd show the difference on rotation of the part

    I have placed 2 copies of the Roof, and rotated 45 degrees, left hand roof was rotated 45 degrees from the front, right hand roof was rotated 45 degrees from the side, then auto supports applied.

    Notice how the left hand roof requires far fewer supports as the roof is all at a 45 degree angle and just grows from the base, whereas the right hand roof has to cope with the curve and change of angles from the curve.

    upload_2021-1-28_0-20-33.png

    I will do a test print of both to see the results.

    Will do the print tomorrow

    upload_2021-1-28_0-38-27.png

    Paul
     
  11. paul_l

    paul_l Staff Member Administrator

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    Just started the print off - approx 4h40m to go - with the cold temps we've been having and the heating being off at night, I thought I'd wait until the heating was back on before starting the print.

    Buried between the smokebox doors and the two roofs are four smoke box door handle, no not four candles. I have tried printing the handle vertical and horizontal, and also mirrored them to give a slightly different position. Two of the smokebox doors have the handles fitted, so we'll how they come out.

    And to give an idea of the final look

    upload_2021-1-28_9-57-51.png

    upload_2021-1-28_9-58-24.png


    Paul
     
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  12. Gary

    Gary Wants more time for modelling.... Staff Member Administrator

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    What are fork handles again...? :avatar::avatar:

    Cheers, Gary.
     
  13. gormo

    gormo Staff Member Administrator

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    Ignore him Paul........these Australian colonials....:facepalm:.....Oh !!!....that`s me too....:facepalm:....:avatar::avatar:
    Just had a thought Paul.......Yes I know that`s unusual, but here we go anyway......those smoke box handles no matter how good you print them, may indeed be easy to break off if accidentally knocked.
    How would you go making up a brass version soldered onto a suitable pin / shaft that could be inserted and glued into a hole in the smoke box door.
    Or.....you could even ask Toto to create a cast version for you..???:scratchchin:
    If it gets bent or damaged, you could just remove it and repair it or slip in a new one.........just thinking ahead...that` s all.
    :tophat:Gormo
     
  14. Walkingthedog

    Walkingthedog Full Member

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  15. paul_l

    paul_l Staff Member Administrator

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    Fork Handles an english language classic

    Hi Gormo

    I have also been thinking of getting them made as a lost wax brass casting. However the thought at the moment, is to glue them in with pva or some other light non-permanent glue, that in the case of damage they could be poked out from the inside and replaced, I know the guy that created them so I / he can always print some replacements :giggle:.
    There some other parts - whistle, coupling hooks, vacuum pipes etc that would also benefit from being cast brass, so may be worth looking at getting all the bits on one sprue.

    Paul
     
  16. Keith M

    Keith M Staff Member Moderator

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    Formerly known as "Nairn Modelling Supplies". I've dealt with him on a number of occasions for 4mm stuff. He does handrail knobs, brass wire, smokebox darts etc at sensible prices and quick delivery. Not had any 7mm stuff from him yet, but doubtless will in the future. No connection except as a satisfied customer.
    Keith.
     
  17. Walkingthedog

    Walkingthedog Full Member

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    I bought a few 4mm bits from them. Thought they were very good quality.
     
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  18. paul_l

    paul_l Staff Member Administrator

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    Roof first

    [​IMG]


    Left hand angled 45 degrees front to back, right hand roof angled 45 degrees side to side

    No antialiasing was applied

    Left hand print


    Feels good, slight banding can be felt with the nail, but will easily be removed with a very light sanding, I may even just try a coat of primer.

    Left hand print


    Adifinate dip can be felt at the half way point almost like a falt spot and the banding is more noticable.

    On the plus side the underside of the prints are spot on, so looks good for printing the whole body at 45 degrees

    Smokebox doors

    Two failed, fortunately 1 of each type.


    Looks good, but I forgot to open out the hole on the smokebox to be able to fit the door, and managed to breat one of the darts, suppose that answers the plastic vs metal debate.

    Paul
     
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  19. redpiperbob

    redpiperbob Full Member

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    No its Four Candles
    Bob
     
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  20. Toto

    Toto I'm best ignored Staff Member Founder Administrator

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    Very promising Paul.

    Still an opportunity for white metal accessories if you can encompass enough parts to make a mould viable. Lost wax maybe the better option . I reckon about £30.00 for the mould and about £4,00 a spruce of about 8. You would need to confirm that with Plataurum though.

    I'd wait until you have the chassis done as well as you may be able ore parts in lost wax and get some kind of economy of scale when ordering.

    Looking forward to seeing how the body paints up as well.

    Cheers

    Toto
     

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