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New Build Night Owl - 4709 Begins

Discussion in 'Steam Traction' started by Just_Sayin, Feb 21, 2012.

  1. class8mikado

    class8mikado Well-Known Member

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    So ... if the front end is a fixed unit how do you allow for a movement/ rotation of the whole unit to confer with a frame alignment, and then fix it in position ?
     
  2. std tank

    std tank Member

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    It is Swindon stuff. I try not to bother or understand.
     
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  3. Sheff

    Sheff Well-Known Member

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    Special Gouch hammers ?
     
  4. Ploughman

    Ploughman Well-Known Member

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    Whatever way you want, as long as it is different to the way any other railway would do it.:):)
     
    Spinner, 60017, std tank and 3 others like this.
  5. mdewell

    mdewell Well-Known Member

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    Hey! There's the right way, and then there's the way other railways do it. ;):D
     
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  6. Bikermike

    Bikermike Member

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    Swindon just holds the cylinder casting and expects the world to revolve round it...
     
  7. class8mikado

    class8mikado Well-Known Member

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    There you go, i expected some thing along the lines of Bolted permanently in place and any minor adjustment required done by precision grinding of the horn guides but these answers are way funnier.
     
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  8. Aberdare

    Aberdare Well-Known Member

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    I was recently asked by Dinmore Manor Locomotive Ltd to assist them with the optical alignment of their new cylinder/frame extension assembly for 3850.

    • The main frames had previously been set level on a set of adjustable steel stands.
    • The new front end assembly consisting of the frame extensions and cylinders was moved into approximate place and mounted on an adjustable lifting frame.
    • A pair of Taylor Hobson micro alignment telescopes were mounted, one in each cylinder, concentric with the front bell mouth of each cylinder. This establishes a 'line of sight' which is on the true centre line of the cylinder at the front.
    • At the rear bell mouth of each cylinder a precision glass optical target was installed and set true to the centre of the cylinder using a rotating dial gauge. This establishes a point which is on the true centre line of the cylinder at the rear.
    • The two telescopes are capable of being adjusted within their mounting frames for the direction in which they point, whilst maintaining concentricity to the bore. The two telescopes are now adjusted so that the cross hairs in the eyepiece are focused and aligned with the target in each cylinder rear bell mouth.
    • From this time onwards any object seen through the telescope which lies on the intersection of the eyepiece cross hairs is also on the cylinder centre line, from the end of the telescope to infinity.
    • A pair of datum marks were set up on the nominal cylinder centres line at the rear of the frames.
    • It was now possible to adjust the whole assembly so that each cylinder centre line was not only at the correct height from the top of the main frames at the front, but that each cylinder centre line intersected the nominal cylinder centre line at the rear of the frames.
    • Using either a precision level or a Taylor Hobson Talyvel on each telescope body it was also possible to confirm that the bores of both cylinders were horizontal.
    Any errors in the measuring equipment are insignificant when applied to steam locomotive construction, building temperature changes and resultant frame expansion have a greater effect on alignment accuracy. The whole job from first setting up to clamping up the frames ready for reaming out the holes for the fitted bolts took only a few hours.

    A few photographs taken of the process in action.

    The new front end on an adjustable frame.
    DFE34A3F-EEAD-4FA5-889E-3F2F32C77280.jpeg

    The two telescopes mounted in the cylinder bores.
    81039B40-99B2-4282-B367-601295120C62.jpeg

    The optical target mounted in a frame with a rotating dial gauge.
    91700463-5885-4190-8A30-C4819B284D07.jpeg

    A view through the eyepiece showing the cross hairs and the central dot on a target, the dot is a few thou in diameter.
    5E0341C1-7437-4DF0-928D-A5584EEF6A20.jpeg

    Andy.
     
  9. class8mikado

    class8mikado Well-Known Member

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    So once the front frames are aligned with the datum on the rear frames 'clamping' in place and coincidental reaming of the joining bolt holes is what fixes the alignment...(?)
     
  10. Jimc

    Jimc Part of the furniture

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    jnc, S.A.C. Martin and Richard Roper like this.
  11. 61624

    61624 Well-Known Member

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    I have to say that I for one have struggled with this description. If the extension frames are new and undrilled I can see that you'd just move them around until aligned and then drill and ream. But if one is recycling an existing set of extension frames, what happens if the hole alignment isn't quite right? Are the holes welded up and re-drilled? Or drilled slightly oversize till the alignment is ok then reamed?
     
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  12. Flying Phil

    Flying Phil Part of the furniture

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    Hi 61624
    As Aberdare says at the end of his very informative post " The whole job from first setting up to clamping up the frames ready for reaming out the holes for the fitted bolts took only a few hours". So, hopefully, none of the holes are too far out of alignment.
     

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