Help Identify Tool? Lathe? CNC Milling?
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  1. #1

    Help Identify Tool? Lathe? CNC Milling?

    Hello just thought I'd see if anyone out there could tell me what this is? Thanks.

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  2. #2
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    Re: Help Identify Tool? Lathe? CNC Milling?

    Sine bar for setting or measuring angles.
    Can be used on mill,or many other applications.
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  3. #3
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    Re: Help Identify Tool? Lathe? CNC Milling?

    Yep.

    Old school.

    ...zap!


    I am not completely insane..
    Some parts are missing

    Professional Driver on a closed course....
    Do not attempt.

    Just because I'm a dumbass don't mean that you can be too.
    So DON'T try any of this **** l do at home.

  4. #4
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    Re: Help Identify Tool? Lathe? CNC Milling?

    Suggest you learn it. Great ancient tool
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  5. #5
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    Re: Help Identify Tool? Lathe? CNC Milling?

    Old school?
    ANCIENT?
    Miller a/c-d/c Thunderbolt XL
    Millermatic 180
    Purox O/A
    Smith Littletorch O/A
    Vintage-
    -South Bend 9in. lathe
    -South Bend 7in. shaper
    -Craftsman power hacksaw
    -FibreMetal 710

  6. #6
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    Re: Help Identify Tool? Lathe? CNC Milling?

    Quote Originally Posted by jpump5 View Post
    Old school?
    ANCIENT?

    In the world of 5 axis high production shops, it's ancient tech.

    In the world that I come from - job shops and tool making, it's an amazing tool that helps when a old crusty seasoned vet teaches you how to use it.
    Miller Dynasty 200DX
    Miller Spectrum 250D
    Miller Millermatic 200
    Bunch of old blue dinosaurs....

  7. #7
    Join Date
    Mar 2015
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    484

    Re: Help Identify Tool? Lathe? CNC Milling?

    To complete the ancient technology shrine there needs to be a sine chart to accompany the sine bar. The sine bar will be an even dimension, 3", 5", and 10" were most common. The sine chart will have a table of angles, commonly to 1 minute of an angle, along with the height of the gauge block stack (or other precision physical object) already multiplied out. Remember, this technology predated the calculator and 5 digit slide rules were far to valuable for use in a machine shop. You either had to look it up in a sine chart, or look it up in a trigonometry table and multiply that by the length of the sine bar by longhand.

  8. #8
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    Re: Help Identify Tool? Lathe? CNC Milling?

    You'll need a set of gauge blocks to use it. Very useful for setting angles very precisely.
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  9. #9
    Join Date
    Mar 2013
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    871

    Re: Help Identify Tool? Lathe? CNC Milling?

    Quote Originally Posted by steve45 View Post
    You'll need a set of gauge blocks to use it. Very useful for setting angles very precisely.
    And a calculator or "smart" phone or computer or the machinery handbook to calculate or set the angle based on the height of the gauge blocks.

    And a granite surface plate to put it all on if you are comparing or evaluating the angle on something.

    More on sine bars: https://en.wikipedia.org/wiki/Sine_bar

  10. #10
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    Re: Help Identify Tool? Lathe? CNC Milling?

    Probably my most prized tool is a 5" sine bar I built 15-20 years ago.
    Hardened,tempered and ground d-2 or s-7 tool steel.
    Crusty old toolmaker ground the rolls for me on an i.d. - o.d. grinder.
    We tested its precision with every means we had available.
    Roll center distance (and other dimensions) accurate to < .0001".
    Miller a/c-d/c Thunderbolt XL
    Millermatic 180
    Purox O/A
    Smith Littletorch O/A
    Vintage-
    -South Bend 9in. lathe
    -South Bend 7in. shaper
    -Craftsman power hacksaw
    -FibreMetal 710

  11. #11
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    Re: Help Identify Tool? Lathe? CNC Milling?

    Ancient?!?! How young are you guys? I'm 37 and learned using sine bars and still do use them in my shop.

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  12. #12
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    Re: Help Identify Tool? Lathe? CNC Milling?

    Yea...I know I'm far from an experienced machinist....But I have been reading up a lot on the subject....Trying to learn as much as possible. I would think that for the home machinist....Hobby machinist....Or even the smaller professional shops....Then you'd still want to know how to use a sine bar and maybe have one also. And yea...You also need all the other stuff to go with it such as gauges and surface plate. But...I would think that they are still a very useful tool to have when you just need to get that angle or dimension perfect.

  13. #13
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    Re: Help Identify Tool? Lathe? CNC Milling?

    Sine bars, Sine tables, Johansson (gage) blocks, granite lapping surfaces, and trig. Beautiful tools and techniques for metrology.
    "Discovery is to see what everybody else has seen, and to think what nobody else has thought" - Albert Szent-Gyorgyi

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