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  1. #1
    Join Date
    Mar 2008
    Posts
    9

    Needs help to get .000 position 17 holes

    :drowning:Hey Guys need your help, I have several parts to make but BP shows .000 in position in 17 holes, can somebody tell me how can make those parts?
    parts are from aluminun .100" thick

    Thanks

  2. #2
    Join Date
    Jan 2008
    Posts
    449
    Go kill the engineer! Is this in a circle or a straight line? How far apart? Cnc or
    manual?

  3. #3
    Join Date
    Feb 2008
    Posts
    547

    Cool

    Aaaa yes....here is the simplest answer. .000 position allows for the possiblity of bonus i.e no bonus no positional allowance occurs if you make the holes their smallest diameter. Bonus and positional allowance occurs if you make them at to their largest diameter. i.e the diameter is .800 +- .005. At .795 you have no allowance or bonus tolerance. At .805 you have +- .005 or about true position of around .0027 ( an est. I didn't figure it out) Also... there is tol. to the location of the BH center location you can add to that.:banana:
    Steve.

  4. #4
    Join Date
    Mar 2008
    Posts
    9

    thanks and another tip

    Thanks for your help
    I'm sending part of blue print let me know if we can apply same criteria to make those parts

    Thanks Again
    Attached Files Attached Files

  5. #5
    Join Date
    Mar 2008
    Posts
    9
    we will use a cncn fadal 4020 10000 rpm 20hp

  6. #6
    Join Date
    May 2006
    Posts
    132
    listen to scadvice.
    you have .000 at .266 diameter.
    you have .03 at .296 diameter.

    good luck
    billy

  7. #7
    Join Date
    Feb 2008
    Posts
    547

    Red face

    Quote Originally Posted by scadvice View Post
    Aaaa yes....here is the simplest answer. .000 position allows for the possiblity of bonus i.e no bonus no positional allowance occurs if you make the holes their smallest diameter. Bonus and positional allowance occurs if you make them at to their largest diameter. i.e the diameter is .800 +- .005. At .795 you have no allowance or bonus tolerance. At .805 you have +- .005 or about true position of around .0027 ( an est. I didn't figure it out) Also... there is tol. to the location of the BH center location you can add to that.:banana:
    Steve.
    Thanks billy....Yes...the same applies. I do want to make one correction though to my original example. I said "or about true position of around .0027 " . That was incorrect. It should have been around .0073 true position. I estimated the wrong way. I was in a hurry to leave and go visit some friends.
    Steve

  8. #8
    Join Date
    Mar 2008
    Posts
    9
    Thanks a lot for your help.
    I apreciate your support

  9. #9
    Join Date
    Jan 2007
    Posts
    243
    True position of ".000" What!? Has to be a Typo on the print. Here is a calculator if you need help calculating the actual True Position on your parts: True Position Calculator. Easily calculate the True Position of Holes with or without Maximum Material Condition (MMC) !
    www.WebMachinist.Net
    The Ultimate Online Source for Machinist Related Stuff!

  10. #10
    Join Date
    Dec 2015
    Posts
    11

    Re: Needs help to get .000 position 17 holes

    Just hold it close as you can. If you don't have reamers, drill about one size under then follow with the correct size. Walah size is dead on!

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