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Highland Railway Drummond 0-4-4T Passenger Tank

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

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  1. May 13, 2021 #301
    paul_l

    paul_l Staff Member Administrator

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    and there's more

    upload_2021-5-13_14-18-37.png

    From the photo's I have a right ang bracket and a loop to hold the pipe upright - this could be fun

    Paul
     
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  2. May 13, 2021 #302
    paul_l

    paul_l Staff Member Administrator

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    upload_2021-5-13_14-33-36.png

    Paul
     
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  3. May 13, 2021 #303
    paul_l

    paul_l Staff Member Administrator

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    started on the rear pipe

    upload_2021-5-13_15-29-2.png

    Now I just need to print them to see if they look ok

    Paul
     
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  4. May 13, 2021 #304
    paul_l

    paul_l Staff Member Administrator

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    And were off

    upload_2021-5-13_16-1-42.png

    1h40m to go

    Printing the front and rear vacumm assemblies, and the whistle.

    Paul
     
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  5. May 13, 2021 #305
    Andy_Sollis

    Andy_Sollis Staff Member Moderator

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    Looks great but I feel the flexi pipe is slightly over size in comparison to the pipe. They are actually not much different in diameter. Half inch at most.
    Look forward to seeing how it comes out! :thumbs: Sometimes things look better in the flesh than on the screen of course!
     
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  6. May 13, 2021 #306
    paul_l

    paul_l Staff Member Administrator

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    And here they are

     
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  7. May 14, 2021 #307
    Walkingthedog

    Walkingthedog Full Member

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    Look pretty good. Hoses do look a bit fat and short though, bit like my late mother in law.
     
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  8. May 14, 2021 #308
    Rob Pulham

    Rob Pulham Happily making models Staff Member Administrator Feature Contributor

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    I have to agree with Brian, on the hoses.

    The other question that I have to ask is how robust do you expect them to be?

    I ask because I tend to shy away from whitemetal vacuum and steam pipes because I fear that they will get broken off in use.
     
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  9. May 14, 2021 #309
    Walkingthedog

    Walkingthedog Full Member

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    When using 3 link couplings the vacuum pipes often get in the way when coupling. Are they brittle like the 3D figures or do they use a different material?
     
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  10. May 14, 2021 #310
    paul_l

    paul_l Staff Member Administrator

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    here's version 2 - what do you think

    upload_2021-5-14_12-29-4.png

    upload_2021-5-14_12-29-58.png upload_2021-5-14_12-30-35.png

    upload_2021-5-14_12-31-11.png

    In the 3D resin they will be susceptable to breaking, however not being mounted on the buffer beam may protect them a bit. But depending on how the turn out, I may see if they would be suitable for either making in whitemetal or lost wax. Or just print up a few of them and replace as required.

    Paul
     
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  11. May 14, 2021 #311
    Rob Pulham

    Rob Pulham Happily making models Staff Member Administrator Feature Contributor

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    Visually they look much better.:thumbup:

    What do you mean by "not being mounted on the buffer beam might protect them"?

    I am intrigued as to how/where you would mount them in that case.
     
  12. May 14, 2021 #312
    Andy_Sollis

    Andy_Sollis Staff Member Moderator

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    you still need something on the end of the pipe. A dummy end. They don’t just float in mid air or you can’t take the brakes off.. it needs to be a closed system. A guard or shunted will remove the vac “bag” off a loco first as this stops any movement of the loco.
     
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  13. May 14, 2021 #313
    paul_l

    paul_l Staff Member Administrator

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    Hi Rob

    The front vacuum brake assembly is mounted on the footplate

    upload_2021-5-14_13-48-51.png

    Hi Andy

    from the above drawing I have a peg to add, and align the hose with the body, well that's this afternoon taken care of :facepalm:

    Paul
     
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  14. May 14, 2021 #314
    paul_l

    paul_l Staff Member Administrator

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    Hi Andy

    Have you tried printing at a 0.025 layer height on your Mono X, and if so do you have any curing settings ?

    Paul
     
  15. May 14, 2021 #315
    Andy_Sollis

    Andy_Sollis Staff Member Moderator

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    No, I’m still 0.05. curing I normally do around 2 mins only. Not had any adverse effects ? (Ok so a few flat parts have curled slightly, but can be weighed back flat until glued in place.)

    pipes look great though! Very impressed. Must have a go my self.
     
  16. May 14, 2021 #316
    paul_l

    paul_l Staff Member Administrator

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    OK how's this

    upload_2021-5-14_14-19-37.png upload_2021-5-14_14-20-12.png upload_2021-5-14_14-20-53.png

    upload_2021-5-14_14-21-26.png upload_2021-5-14_14-22-2.png

    Paul
     
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  17. May 14, 2021 #317
    paul_l

    paul_l Staff Member Administrator

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    And the rear pipe

    upload_2021-5-14_15-20-56.png

    Paul
     
  18. May 14, 2021 #318
    Andy_Sollis

    Andy_Sollis Staff Member Moderator

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    What’s the small loop on the short pipe? Looks very fragile and I can’t fathom the purpose?

    Is there a photo of the real thing? Sometime they are offset where the dummy is. I take it these are part of the pipe? (Some were..)
     
  19. May 14, 2021 #319
    paul_l

    paul_l Staff Member Administrator

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    Hi Andy

    Due to the small size of the locomotive, the vacumm pipe had to fold over to allow the smokebox door to open, the loop retains it verticle.

    Another part needed is the front wheel sandpipe holder

    upload_2021-5-14_16-14-6.png

    Well time for another test print, this time I'm trying a 0.025 layer height - approx 1h20m to go

    upload_2021-5-14_16-12-53.png

    fingers crossed - I've tried reducing the cure time by a 1/3rd. I'm also using WD40 Dry PTFE lubricant on the FEP. My first print was the original vacuum pipe prints. Worked great all prints stuck to the build plate and not the FEP.

    Paul
     
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  20. May 15, 2021 #320
    paul_l

    paul_l Staff Member Administrator

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    NUTs - it failed, only two stuck to the build plate.

    Time to clean out everything and remove the bits from the FEP sheet. I use a 1" (25mm) Pure Bristle brush and the dirty IPA bath for this, being careful not to get any of the dirty IPA on the underside of the FEP sheet. The PTFE showed its worth, all the bits cleaned off with brush, I didn't need to resort to the plastic scraper, which can lead to dinking the FEP.

    Decided to redo the build to 0.05mm layer height and revert back to the normal settings. Then I noticed the layer height was still at 0.05 instead of 0.025, no wonder they didn't stick :facepalm:

    Re-did the 0.025 build with the correct layer height, estimated print time is now 2h28m - that's more like it, double the number of layers, shorter cure times, but the plate lifting and lowering more times increases the build time.

    Results in the morning, and the forecast for tomorrow is rain - oh happy days :avatar:

    Paul
     
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