Re: Drifting of drilling bit

From: Clarence (No_at_No.Com)
Date: 09/12/04 

Date: Sun, 12 Sep 2004 04:12:09 GMT

"James T. White" <SPAMjtwhiteGUARD@SPAMhal-pcGUARD.org> wrote in message
news:4143a5af$0$448$a726171b@news.hal-pc.org...
> "terry" <leonlai2k@yahoo.com> wrote in message
> news:9904d48.0409081951.37ea222d@posting.google.com...
> > Hi,
> >
> > When drilling holes in PCB, drifting of drilling bit will make the
> > copper pad vanish, do anyone knows how to prevent this to happen?
> >
> > I know the general method is to use shorter and smaller drilling bit.
> > Does the rotation speed affect the result?
> >
> > Thanks!
>
> Assuming you are etching your own boards, you might find it useful to put a
very
> small hole at the center of all the pads. If you get the size right, it acts
> just like a center punch on metal and the drill stays in the center of the
pad.
> It also helps to have very, very sharp drill bits and get the drill speed
right.
>
> --
> James T. White

If your using re-sharpened bits, and who isn't? Be very careful to see to it
the center of the bit is really the center of rotation. We had this problem
and solved it by carefully inspecting the drill bit under a microscope and
rotating it in a mandrill to assure they are concentric on the center of
rotation. Made a BIG difference.

Also be sure the drill is turning at the recommended RPM and not loading down,
they tend to drift if the bit is binding.

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