CNC hole, how round and smooth? - Page 2
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  1. #21
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    Quote Originally Posted by Finegrain View Post
    Try interpolating a round boss, say, 1/2" diameter, then measure that with a good tenths micrometer at various clock positions. This lets you pick up axis anomalies easier than with a bore mic.

    Regards.

    Mike
    Sure, but he didn't ask about a boss

  2. #22
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    I've used the following machines and these were the results for interpolated holes:

    1) Unmentionable lightweight hobby mill: TIR ~0.002"
    2) Prototrak (Bridgeport): TIR ~0.007" (oval in X)
    3) Hurco VM10i: TIR ~0.0004"
    4) Doosan DNM 5700: TIR ~0.00025"


    Since I don't have a coordinate measuring machine or any specialized tools that go sub-micron, I often measure with a tenths indicator in the machines own spindle; of course this introduces its own error from the spindle bearings, but I've found spindle bearing TIR is almost always around 2 microns for full sized machines and 5-15 microns for non-precision spindle bearings.

    I'd like to hear what other people are getting with their machines, so everyone please post what type of machine you have and what your close tolerance interpolated holes generally come out as. I'd like to know just how good you can get with glass scale machines, linear machines, and anything with double ball nuts.

  3. #23
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    Quote Originally Posted by Hazzert View Post
    You sound like an absolute joy to work with.
    I am, unless you are a slacker, then my goal is to help you find other employment more suitable to your skill set.

  4. #24
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    Quote Originally Posted by litlerob1 View Post
    There is no such thing, as "perfect".
    You have never spoken to my wife.

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  6. #25
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    Quote Originally Posted by garyhlucas View Post
    I am, unless you are a slacker, then my goal is to help you find other employment more suitable to your skill set.
    But, but you're the one they sent home. Bastards!

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