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Thread: Acme tap drill chart

  1. #1
    Join Date
    Jan 2003
    Location
    Northern KY.
    Posts
    18

    Default Acme tap drill chart

    I've searched for a Acme tap drill size and found no info for it. The size is 1/2 -10 LH Acme. I have my cross feed nut blank in the mill vise ready to drill as soon as I come up with the drill size. Anybody ?

    Paul

  2. #2
    Join Date
    Mar 2002
    Location
    webster, ma
    Posts
    822

    Default

    I just did the same nut (1/2x 10 acme.) Used a tandem tap from MSC. I drilled large enough to barely clear the end of the tap. The operation was very smooth. No problems as all.
    gvasale

  3. #3
    Join Date
    Mar 2001
    Location
    Nottingham, England
    Posts
    15,232

    Default

    First result from googling "acme tapping chart"

    http://www.victornet.com/reference/Acme_Tap_Drill.html

    .
    .

    Sir John , Earl of Bligeport & Sudspumpwater. MBE [ Motor Bike Engineer ] Nottingham England.




  4. #4
    Join Date
    Jan 2006
    Location
    Suffolk, England
    Posts
    1,264

    Default

    I can't categorically help with the correct tapping dill size, but I can point you in the direction of a very useful chart.

    http://www.landisthreadingsystems.co...hreadforms.pdf

    This gives you the option of several sizes for the major/minor diameters of the Acme thread depending on the tolerance class and fit you want.
    However as it's a nut for a leadscrew I would perhaps suggest that drilling undersize and then boring it to a more precise size commensurate with the fit you want to obtain may be a good idea.

    I've never tapped an Acme thread before (never screwcut one either that I can remember), but I suspect that others that have done so on here will provide you with better advice.

    Peter

  5. #5
    Join Date
    Jan 2003
    Location
    Northern KY.
    Posts
    18

    Default Acme tap drill chart

    Thank's fellows, i don't understand why I didn't come up with a chart, John, it is embarrassing to see how quick you came up with it.
    Thank's again fellows. HSM comes to the rescue !!

    Paul

  6. #6
    Join Date
    Nov 2009
    Location
    Oak Ridge Tenessee
    Posts
    245

    Default Welcome neighbor

    I don't have a acme chart here at home. I just wanted to say welcome to the forum. I noticed you are from Ky' I am in TN. Hello neighbor!

  7. #7
    Join Date
    Dec 2004
    Location
    Western New York U.$.A
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    Default

    pwasbury, note that on the website John Steveson posted it says that it's 10.4mm APROXIMATE What the hells with that John?; I thought that metric crap was so much more precise !!
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  8. #8
    Join Date
    Dec 2006
    Location
    Hazel Park, Michigan
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    337

    Default

    Quote Originally Posted by Your Old Dog
    pwasbury, note that on the website John Steveson posted it says that it's 10.4mm APROXIMATE What the hells with that John?; I thought that metric crap was so much more precise !!
    ..............

  9. #9
    Join Date
    Nov 1999
    Location
    SE OZ
    Posts
    1,966

    Default Azzit tizz

    Quote Originally Posted by Your Old Dog
    pwasbury, note that on the website John Steveson posted it says that it's 10.4mm APROXIMATE What the hells with that John?; I thought that metric crap was so much more precise !!
    Hey YOD.

    Just how and where did you measure all those metric craps? I trust you were very PC. I guess you had your hands full.

    As you like it - or not

    http://www.victornet.com/reference/Acme_Tap_Drill.html


  10. #10
    Join Date
    Mar 2001
    Location
    Nottingham, England
    Posts
    15,232

    Default

    Quote Originally Posted by Your Old Dog
    pwasbury, note that on the website John Steveson posted it says that it's 10.4mm APROXIMATE What the hells with that John?; I thought that metric crap was so much more precise !!
    That's because it was measured with this

    .

    Sir John , Earl of Bligeport & Sudspumpwater. MBE [ Motor Bike Engineer ] Nottingham England.




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