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Thread: Obsolete tools

  1. #1
    Supporting Member mklotz's Avatar
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    Obsolete tools

    Saw this in a post over on Chaski. All you old pharts who dream of going back in time to a day when there were no computers or anything electronic in the drafting room will love it...

    Museum of Obsolete Drafting Technology

    https://www.moodt.org/exhibis/

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  2. The Following 9 Users Say Thank You to mklotz For This Useful Post:

    baja (Feb 23, 2021), bruce.desertrat (Feb 23, 2021), Harvey Melvin Richards (Feb 23, 2021), Inner (Feb 22, 2021), Jon (Feb 22, 2021), KustomsbyKent (Feb 22, 2021), nova_robotics (Feb 22, 2021), Philip Davies (Feb 21, 2021), Tonyg (Feb 23, 2021)

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    Supporting Member Philip Davies's Avatar
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    I can’t show you the link, but I found it on Pinterest: Trident Tomahawk trisector.
    I shall be using my draughting equipment this week, but I would like to have a pair of compasses that retain their radius!

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    Supporting Member mklotz's Avatar
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    Quote Originally Posted by Philip Davies View Post
    I can’t show you the link, but I found it on Pinterest: Trident Tomahawk trisector.
    I shall be using my draughting equipment this week, but I would like to have a pair of compasses that retain their radius!
    Here you go...

    https://en.wikipedia.org/wiki/Tomahawk_(geometry)

    The compass with LH-RH thread to adjust spacing holds its setting very well, e.g...

    https://www.amazon.com/Staedtler-Com...3938532&sr=8-8
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    Philip Davies (Feb 21, 2021)

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    Supporting Member ipsumental's Avatar
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    Thanks. good photo. I've been looking for that instrument. What's it called? For lack of a better, I refer to it as a "scissor equidistancer". I'd make one, but...

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    Reminds me of a common sheet metal/aircraft tool called a "rivet spacer." Very handy when laying out a long row of equidistant holes or spaces.

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    There is also a compass/divider that works somewhat like this which describes the "Golden Ratio."

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    Quote Originally Posted by owen moore View Post
    There is also a compass/divider that works somewhat like this which describes the "Golden Ratio."
    Here's a plan to make one of those. https://cdn.woodsmith.com/files/issu...ge-drawing.pdf

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    Quote Originally Posted by mklotz View Post
    Saw this in a post over on Chaski. All you old pharts who dream of going back in time to a day when there were no computers or anything electronic in the drafting room will love it...

    Museum of Obsolete Drafting Technology

    https://www.moodt.org/exhibis/

    I remember laboriously (VERY laboriously) lettering the figure captions for my 7th grade science project with my dad's Leroy set. I think I spent more time on that than the project itself!

  11. #9
    Supporting Member mklotz's Avatar
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    Quote Originally Posted by bruce.desertrat View Post
    Here's a plan to make one of those. https://cdn.woodsmith.com/files/issu...ge-drawing.pdf
    Seems a waste of time to me. All one really needs is a tape measure and a calculator.

    The Golden Ratio is the solution to the equation:

    1/X = X-1

    or in canonical form:

    X^2 - X - 1 = 0

    which has the (positive) solution:

    X = [ 1 + sqrt(5) ] / 2
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    Take a look at a Gerber variable scale for scaling drawings, reading values off a map or graph.
    Gerber variable scale | Objects | The Collection of Historical Scientific Instruments
    https://www.planetanalog.com/whats-a...riable-scale/#

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