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  1. #1
    Join Date
    Nov 2012
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    Default Triangles for machining

    Just finished making these for milling setups. 45deg and 60/30deg.
    I made them on the CNC from 1/4" perspex and they are both 100mm on the hypotenuse.
    There's no way for me to check them for accuracy but they should be aweful close since they are mathematically produced.
    If anyone is interested in having the G-code just let me know and I'll post it.

    triangles.jpg

  2. #2
    Join Date
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    Default

    Nice!
    A reasonable way to check them would be to cut another two of the 30/60 and then you could put 30+60 and check for square.
    Use the third one for 30 +30+30 to make sure you havenít got 28 + 62 deg etc.
    The 45deg one you should be able to just check against a second one.

    Steve

  3. #3
    Join Date
    Nov 2012
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    Default

    Quote Originally Posted by OxxAndBert View Post
    Nice!
    A reasonable way to check them would be to cut another two of the 30/60 and then you could put 30+60 and check for square.
    Use the third one for 30 +30+30 to make sure you havenít got 28 + 62 deg etc.
    The 45deg one you should be able to just check against a second one.

    Steve
    Yeah I knew that. I just didn't want to cut any more lol.
    They should be spot on though. They were designed in Autocad using exact angles, processed in Fusion360 for the tool path, then cut with CNC.

  4. #4
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    Sep 2012
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    North Yorkshire UK
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    Default

    Hi Phaser, Guys,

    Making another one would be a test of how accurate your CNC is !
    Best Regards:
    Baron J.

  5. #5
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    Nov 2012
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    Quote Originally Posted by BaronJ View Post
    Hi Phaser, Guys,

    Making another one would be a test of how accurate your CNC is !
    Ha ha no no you're not talking me into it

  6. #6
    Join Date
    Jul 2006
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    Athelstone, SA 5076
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    Default

    Quote Originally Posted by OxxAndBert View Post
    Nice!
    A reasonable way to check them would be to cut another two of the 30/60 and then you could put 30+60 and check for square.
    Use the third one for 30 +30+30 to make sure you havenít got 28 + 62 deg etc.
    The 45deg one you should be able to just check against a second one.

    Steve
    failing that ...he could make some for us and we could check and advise him if they're any good

  7. #7
    Join Date
    Nov 2012
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    Mid North Coast NSW
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    Default

    Making these triangles has made me realize something that could be significant to some people.

    If you have a lathe where the dials read direct, and you take a 10 thou cut, you will actually take 20 thou off the diameter of the part , right ?
    With a 30/60 triangle the opposite side is exactly half the length of the hypotenuse.
    So just swivel the compound to 30deg and whatever you set that dial to will come off the diameter.

    I don't have any trouble remembering to double the figure but it can be confusing so this might useful to someone.

  8. #8
    elanjacobs is offline Apprentice gear maker and machine doctor
    Join Date
    Aug 2008
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    Melbourne
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    30
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    Default

    Further tip similar to that, setting your compound to 3 degrees off horizontal will give you a (near enough to) 10:1 diameter ratio (1 thou on the compound = one tenth on diameter) if you need really fine control.

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