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  1. #151
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    Quote Originally Posted by Handyjack View Post
    Keith, while I am not 100% sure it applies to rocket, two cylinder steam engines normally have the cranks at 90degrees so both cylinders can never be at the end of the stroke.
    I do know that with Stephensons Rocket, if one cylinder was past the point where steam would automaticaly "cut off", the valve could be manually opened to get the engine moving. That is what the hand levers by the left cylinder are for. You would hate to be in a situation where you can not get the engine to move backwards or forwards without having to bar the engine a little bit.
    With your Peny-Darren locomotive, if you were unfortunate enough to stop on "Dead Centre" (end of stroke) all you would need to do is move the flywheel (by hand) 5 or 10 degrees to get it in a position to start.

    Keep up the good work.
    Thanks Kevin,

    Yes I asked that question around post#65 and the video shows 90 degrees difference. Bit of a muck up by me but an easy fix at this stage.
    Obviously I forgot about the previous video.
    Thanks for your comments and top locomotive knowledge

    Regards

    Keith

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  3. #152
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    Now before you think if one cylinder is at end of stroke (dead centre) the other cylinder will be half way, I think you will find it is close but not quite due to the angularity of the connecting rod.

  4. #153
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    Quote Originally Posted by Handyjack View Post
    Now before you think if one cylinder is at end of stroke (dead centre) the other cylinder will be half way, I think you will find it is close but not quite due to the angularity of the connecting rod.
    Thanks - I will check it out

  5. #154
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    Arrow Why me?

    I hit the wrong place and added a more picture please but on second thought I do want pictures of you checking it out. LOL
    Just kidding there keith

  6. #155
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    Not sure if I can come up with an image for you. It is just something I remember from my engine driving classes.

  7. #156
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    HandyJack don't worry about it, some of these buttons are dangerous in the wrong hands.

  8. #157
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    CFADCC45-B950-40D2-9D87-3E72FB609B61.jpg2DE68C1E-52F3-451B-8DF0-009FF6F120E4.jpg

    These 2 pictures were taken on the same visit and, even though they are only of the ‘sectioned replica’, there are probably (hopefully?) mechanical reasons why it should be assembled accurately. I haven’t got my protractor out (where IS Trevor when you need him*) but it appears very close to 90 degrees by eye?

    fletty

    * When Trevor and I were researching pictures of subtle differences between Lawrence of Arabia’s various Brough Superiors, he had “noticed” that in the pictures of George VII, Lawrence’s seventh Brough, the rear wheel appeared to be 19” whereas the front is 21”. When I sheepishly contacted the Brough Owners Group in England to confirm this outrageous observation, they CHECKED THE FACTORY WORKS CARD (!) and confirmed that the rear wheel is indeed 19” and the front is 21”. This hitherto unnoticed (and undisclosed?) quirk apparently resulted from the Great Man himself being vertically challenged?
    RIP Trev
    a rock is an obsolete tool ......... until you don’t have a hammer!

  9. #158
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    Trev will be chuckling Alan

    I will do some work on paper and try to get a photo of it for you Bruce

    Thanks for the photos Alan

    Regards

    Keith

  10. #159
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    Quote Originally Posted by Handyjack View Post
    Now before you think if one cylinder is at end of stroke (dead centre) the other cylinder will be half way, I think you will find it is close but not quite due to the angularity of the connecting rod.
    You were spot on Kevin.

    See attached sketch - The top section of stroke to reach the 90 degree is 56% of the piston stroke - whilst to reach full length is 44% of the stroke length.
    55.jpg

    Thanks

  11. #160
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    I was hoping it would be in English.
    I put it in the Google translator and it said sorry buddy but we can't help you.
    Just kidding there Keith, there's a science to everything especially trains!

  12. #161
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    Hi All,

    Completed the end valves on the cylinders and the front 90 degree on/off valves near the cylinder glands.

    This locomotive had square head bolts on the end covers of the cylinders. I used Tassie Oak for these - cut down to make a square head by using my table saw.

    I have cut my piston shafts to the correct length as per my previous post.

    The assembly can still be dismantled (for finish painting - down the track so to speak)

    Primed the 2 drive cylinder assemblies with Automotive spray primer.

    I reckon I will prime everything and then dismantle for hand painting - like I did with the Stirling Single.

    Now to make the Internal Brackets to attach the cylinders to the boiler assembly.

    Once the bracket locations and fittings are finalised - I can then start working out my method of timber cladding the boiler.

    Regards

    Keith

    56.jpg

  13. #162
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    Sep 2017
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    Looking good Keith! I’m looking forward to seeing the end product

  14. #163
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    Quote Originally Posted by Benny_ View Post
    Looking good Keith! I’m looking forward to seeing the end product
    Thanks Benny,

    I am fitting the cylinders to the boiler assembly at the moment. Should have some photos in the next day or so.

    Regards

    Keith

  15. #164
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    I thought you might find these truck builds interesting both metal and wood.

  16. #165
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    Quote Originally Posted by htl View Post
    I thought you might find these truck builds interesting both metal and wood.
    That looks a top build. Thanks for looking for it and sharing

    Regards

    Keith

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