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Thread: Using a Ball End Mill

  1. #1
    Gunco Member PullThru 1948's Avatar
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    Default Using a Ball End Mill

    Hi Folks,

    Is it advisable, right or wrong, to "pre-drill" with Drill or End Mill prior to finishing off the job with the Ball End Mill.

    OR, Just dive in and cut the whole thing with the Ball ?.

    Last time I Riveted, I drilled part way and "eyeballed" to finish it with a Dremel. Took a while.

    It's for Riveting AKs as you might have guessed.

    Any guidance welcome. Thanks all.

    Making TOOLING !!

    PT1948
    Last edited by PullThru 1948; 02-09-2013 at 10:27 PM. Reason: Confusing and Vague !

  2. #2
    Gunco Member Johnny_V's Avatar
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    There are two schools of thought on this matter. Some will say "since it's a 2 flute end mill, just plunge in" others "always pre-drill ". I have always pre-drilled then finished off with the ball end mill. Some would not agree with me, but this is what I do and it has always worked well for me.

    Just my 2
    Johnny V
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  3. #3
    Gunco Member PullThru 1948's Avatar
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    Thanks Johnny V , I was hoping to hear that, as to me, that seems the way to do it.
    Always good to get a second opinion if in doubt.
    Cheers.

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    Chief Administrator 7.62x39's Avatar
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    Are we talking about trunnion rivet holes here? I don't understand why you would need to use a ball end at all.
    .

  5. #5
    aka: SDK1968 dutigaf's Avatar
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    me neither....

    if you got lots of drill bits and use expensive mill bits?

    then you drill first and "wipe" it with a mill bit...

    if you dont care and time is more important? hit it with the mill bit to start with.

    a ball mill bit is good for helping you get centered up verses just a 2 flute thats gonna cut wherever you put it.
    say what you mean & mean what you say


  6. #6
    Gunco Member Johnny_V's Avatar
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    Quote Originally Posted by dutigaf View Post
    a ball mill bit is good for helping you get centered up verses just a 2 flute thats gonna cut wherever you put it.
    A 2 flute end mill is, for the most part "center cutting", same as a "Ball end mill", but if your setup is not rigid, you'll create more problems than you bargained for, especially in sheet steel (AK receivers). Also, it is not a good idea to "plunge cut" a 2 flute, or for that matter, any mill into your workpiece, as it put undue stress on your cutter and could cause the end mill to shatter.
    Johnny V
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  7. #7
    Always sore, always tired Bradrock's Avatar
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    Please clarify what the heck this is about. 8:40 am & you gave me a headache allready trying to guess!
    Are you making a triggerguard rivit jig?
    " Save a tree...........Eat A Beaver!"

  8. #8
    Chief Administrator 7.62x39's Avatar
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    Quote Originally Posted by Bradrock View Post
    Please clarify what the heck this is about. 8:40 am & you gave me a headache allready trying to guess!
    Are you making a triggerguard rivit jig?
    I dunno.
    From the comments about going through ak receivers and riveting I assumed he was talking about trunnion holes. I asked if that was it, but OP didn't respond.

    I'm out
    .

  9. #9
    aka: SDK1968 dutigaf's Avatar
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    Quote Originally Posted by Johnny_V View Post
    A 2 flute end mill is, for the most part "center cutting", same as a "Ball end mill", but if your setup is not rigid, you'll create more problems than you bargained for, especially in sheet steel (AK receivers). Also, it is not a good idea to "plunge cut" a 2 flute, or for that matter, any mill into your workpiece, as it put undue stress on your cutter and could cause the end mill to shatter.
    Johnny,

    center cutting vs self centering........ NOT the same.

    center cutting cuts from the center of where ever you put it.. lots of guys miss the holes by a smidge in any direction. :-)

    non machinist guys that use ball nose mill bits do it cause they leave it loose, put it against the old hole.. THEN after its centered itself....sometimes they tighten up so it cant woller.... sometimes not.

    if you have a build party with guys that arent machinists you'll see this a lot.

    s
    say what you mean & mean what you say


  10. #10
    Gunco Member Johnny_V's Avatar
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    Quote Originally Posted by dutigaf View Post
    Johnny,

    center cutting vs self centering........ NOT the same.

    center cutting cuts from the center of where ever you put it.. lots of guys miss the holes by a smidge in any direction. :-)

    non machinist guys that use ball nose mill bits do it cause they leave it loose, put it against the old hole.. THEN after its centered itself....sometimes they tighten up so it cant woller.... sometimes not.

    if you have a build party with guys that arent machinists you'll see this a lot.

    s
    Glad I don't go to those build parties. Can't say I ever let anything "woller"....

    Isn't "wollering" something hogs do???????
    Johnny V
    NRA Endowment Life Member
    Member OGCA
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