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Thread: Can Anyone Identify this Centre Marking Tool?

  1. #11
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    I've always used the method shown to me in tech drawing class at high school, i.e., draw another line angled upward and starting at the same point of the line to be divided. Make it of such a length that one can mark off equidistant points, say, 10mm apart.

    From the last mark, draw a line down to the end of the line to be divided. Now draw lines parallel to that from each mark. The will divide the original line in equal spaces.

    Something like this:



    Compared with that, the rivet spacing tool is such a good idea.

    Quote Originally Posted by trout1105 View Post
    As many holes as you like, Simply mark them off using the measurments on the ruler
    Show me how.
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  2. #12
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    Quote Originally Posted by trout1105 View Post
    As many holes as you like, Simply mark them off using the measurments on the ruler
    I’ve got a ruler for that - this tool allows much faster positioning and accuracy too - I would actually use this for riveting as that’s one of my favourite fastening methods. I do usually use a ruler to mark out the spacing but I could drill the holes and be done in the same time it takes to just mark them with a ruler.
    If you need to contact me please email homestarrunnerau@gmail.com - thanks - Gav.

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    Quote Originally Posted by Homestar View Post
    I’ve got a ruler for that - this tool allows much faster positioning and accuracy too - I would actually use this for riveting as that’s one of my favourite fastening methods. I do usually use a ruler to mark out the spacing but I could drill the holes and be done in the same time it takes to just mark them with a ruler.
    Drill holes into a parallel ruler and you have your device
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    Quote Originally Posted by trout1105 View Post
    Drill holes into a parallel ruler and you have your device
    But it’s not adjustable, nor as accurate most likely and by the time you measure and drill a template you could have done the job. Also, if you have to make a different template up for every job it’s far easier to buy this tool.
    If you need to contact me please email homestarrunnerau@gmail.com - thanks - Gav.

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    I did plenty of skin repairs on aeroplanes but never used a tool like that , would have been good .

    how small can it measure?

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    Handy old tools

    Ahhhh! Good engineering tools from the "good old days" . . . love'em. When men were men and engineers were engineers.

    I've got some beauties inherited from my dad when we used to fix everything ourselves in our cars . . all pre television and computers days.
    We then had to use what is known as our brains and what we were taught in mathematics at school. I'm talking from a school time in 1945-1950.

    We simply thought about the spacing and how many spaces we wanted. Measure the distance and divide that length by the number of spaces you thought adequate.
    Then using the spring callipers, open them to the measured space distance, then walk them along the line. Of course the callipers had many other uses . . scribing circles and quadrants etc.

    But it's easier today . . . in metric. Try dividing this length of iron bar into 7 equal pieces allowing for the saw cut width . . . a length of - 3yards 2ft 4½ inches with a blade width of 3/16 inch
    No calculators please - they hadn't been invented.

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    That device looks useful in the workshop for sure.

    I use a long piece of large bungy cord elastic in a similar way when fencing on the farms. For batten spacing between posts and placing posts in a stock yard setting or shorter stretches. Place equi-distant marks on a slightly stretched length of elastic. Stretch the bungy elastic between the points you want equal spacing for and "ta daaa". Has saved much time messing about on the hillside with tape measures.

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