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Drill Sizes

autodeskguest

What do the drill sizes in the menus mean?  Actual drill or plated size?  Why

are they expressed to so many decimal places?  I need a .061 hole for a staked

turret terminal; do I uese that .063xxx drill size?  I am used to seeing a

simple selection like .061 in menus of simple programs like the ExpressPCB

designer.  What do I wind up with if I just type in .061?

 

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  • analog wrote on Mon, 14 December 2009 19:41

    What do the drill sizes in the menus mean?  Actual drill or plated

    size?

     

    You should be specifying final hole size, and that's what most board houses

    expect.  Check with your board house to be sure though.

     

    Quote:

    Why are they expressed to so many decimal places?

     

    Huh?  What would you prefer, all holes rounded to 50 mils?

     

    Quote:

    I need a .061 hole for a staked turret terminal; do I uese that .063xxx

    drill size?

     

    You should always leave a little slop for inaccurracy of the final hole,

    and you need some clearance to fit the pin thru the hole.  If you figure

    the resulting hole will be +-4 mils from what you specify, then you should

    be pretty safe.

     

    The common sizes near what you want are .061 and .067 inches.  Obviously

    061 is too small if you need the final hole to be at least .061 in

    diameter.  Therefore, .067 should work, assuming you already left clearance

    for the part in your .061 spec.

     

    Quote:

    What do I wind up with if I just type in .061?

     

    A little more than .060 and a little less than .062.

     

    --

    Browser access to CadSoft Support Forums at http://www.eaglecentral.ca

     

Reply

  • analog wrote on Mon, 14 December 2009 19:41

    What do the drill sizes in the menus mean?  Actual drill or plated

    size?

     

    You should be specifying final hole size, and that's what most board houses

    expect.  Check with your board house to be sure though.

     

    Quote:

    Why are they expressed to so many decimal places?

     

    Huh?  What would you prefer, all holes rounded to 50 mils?

     

    Quote:

    I need a .061 hole for a staked turret terminal; do I uese that .063xxx

    drill size?

     

    You should always leave a little slop for inaccurracy of the final hole,

    and you need some clearance to fit the pin thru the hole.  If you figure

    the resulting hole will be +-4 mils from what you specify, then you should

    be pretty safe.

     

    The common sizes near what you want are .061 and .067 inches.  Obviously

    061 is too small if you need the final hole to be at least .061 in

    diameter.  Therefore, .067 should work, assuming you already left clearance

    for the part in your .061 spec.

     

    Quote:

    What do I wind up with if I just type in .061?

     

    A little more than .060 and a little less than .062.

     

    --

    Browser access to CadSoft Support Forums at http://www.eaglecentral.ca

     

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