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  1. #41
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    Quote Originally Posted by DMF_TomB View Post
    .....on another job we have a precision linear rail setup straight within 0.001" per 60" and the next day it was wavy over 0.005". the old timer working with me laughed at the setup. as he figured the sun coming through a skylight would cause the metal to expand relative to the concrete floor holding the rail every foot. as the metal expanded it was longer and the only way it could move longer was to go wavy like a snake. we tried they next day when it was cloudy all day and the rail was straight again....
    (To continue the hijack.)
    I read about how this 'snakiness' is prevented in welded railtrack. It is installed stretched so temperature changes just alter the stress in the rail. Of course if the temperature goes too high the expansion overcomes the stretch and the raill buckles. Conversely, if it gets too cold the contraction imposes too much stress and the rail breaks. Both of which do happen but not frequently and the failures are normally found before a 280km/h train tries to go whistling by.

    An open mind is a virtue...so long as all the common sense has not leaked out.


  2. #42
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    Quote Originally Posted by greybeard View Post
    I suppose one could imagine both frame and "strings" made from carbon fibre

    Back off topic - that kantele music on you tube is something else, and am becoming a fan !
    Onnellista uutta vuotta

    John
    Happy new year to you too!
    If you ever decide that you want to build a Kantele I might maybe be able to get some instructions for you.
    Or, when I get a chance I will make some CAD drawings & gcode. Some day...

    Hub

    :) Current build: http://www.cnczone.com/forums/diy-cnc-router-table-machines/264838-new-machine-desing-quot-cnm13-quot.html


  3. #43
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    Quote Originally Posted by hub View Post
    Happy new year to you too!
    If you ever decide that you want to build a Kantele I might maybe be able to get some instructions for you.
    Or, when I get a chance I will make some CAD drawings & gcode. Some day...

    Hub
    It's already crossed my mind , so thanks for the offer.
    Perhaps I should make it on condition that you do as well.....

    John

    It's like doing jigsaw puzzles in the dark.
    Enjoy today's problems, for tomorrow's may be worse.


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    Quote Originally Posted by greybeard View Post
    It's already crossed my mind , so thanks for the offer.
    Perhaps I should make it on condition that you do as well.....

    John
    Oh man.. For me, it's not possible to start during at least the next 2 years. But if you can wait.. Let's go for it!


    :) Current build: http://www.cnczone.com/forums/diy-cnc-router-table-machines/264838-new-machine-desing-quot-cnm13-quot.html


  5. #45
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    With my memory, it's going to need you to remember, but 1st Jan 2014 send me the code

    John

    It's like doing jigsaw puzzles in the dark.
    Enjoy today's problems, for tomorrow's may be worse.


  6. #46
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    Quote Originally Posted by greybeard View Post
    With my memory, it's going to need you to remember, but 1st Jan 2014 send me the code

    John
    Oh no.. My memory is not that great.. We're in trouble!
    But luckily, there is a solution I think, I'll mention this to my wife, to remind me. She remembers everything down to minor details!

    :) Current build: http://www.cnczone.com/forums/diy-cnc-router-table-machines/264838-new-machine-desing-quot-cnm13-quot.html


  7. #47
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    I'd already told mine.
    "When will you have time....".
    "In a couple of years ?"
    "Perhaps...."

    John

    It's like doing jigsaw puzzles in the dark.
    Enjoy today's problems, for tomorrow's may be worse.


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Steel wire in tension

Steel wire in tension