Re: [CAD_CAM_EDM_DRO]floating z axis

Jim,

I use a floating engraving head to engrave letters and logos into
control panels. Problem is, using a Vee type cutter when engraving,
even a .020" bow in the material makes the engraving look bad when
doing fine work such as small letters. It goes from fine lines to
fat lines. This will be a problem if you are doing PC boards with close
traces, if the board is not perfectly flat. I built it from a standard
engraving spindle, mounted to a small THK linear slide with a spring
pushing the whole thing down. The engraving head allows fine
adjustment of the depth, and it has a nose piece that rides on the
work piece.

Bill

----- Original Message -----
From: "Jim Avey" <jimavey@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Thursday, May 23, 2002 1:30 PM
Subject: RE: [CAD_CAM_EDM_DRO]floating z axis


> A couple of years ago I started this pcb milling machine project and last
> week I pulled the box with all the pieces out and started working on it
> again.
>
> I remember something about modifying the z axis so it could float up and
> down - perhaps with some sort of "shoe" around the end mill/dremel so the
> mill depth would stay constant - even if the pc board was not flat. (This
is
> important because there is lots of surplus and cheap "warped" pc board
stock
> available. I use this warped pcboard on some chemically etched boards I
> make.
>
> Does this jog anyone's memory? I searched the archives - no luck.
>
>
> Jim Avey
>
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