RE: [CAD_CAM_EDM_DRO] Re: one for the math gurus.....Squaring an Axis

-----Original Message-----

>From: mart_wid [mailto:vwa1244302@...]
>You could do what I have done, and that is make yourself a
>Cylinderical Square. These are about as perfectly square as anyone
>would need as in effect their squareness is generated.
>To make one, [...] Turn between centres and get
>the smoothest finish possible and get it as parallel as you can. Face
>each end and chamfer sharp edges. You now have a perfect square that
>can be used with confidence.

Only if your lathe tailstock is not off-centre (giving a conical "square") and
your lathe ways are tight and straight (not worn).

You must also be careful when *using* a cylindrical square that the plane in
which you are trying to get a square line is parallel to the central axis of the
square (i.e. it must be square in the 3rd dimension), otherwise instead of
tracing out a straight line square to your surface, you will trace out an
ellipse. To visualize this, imagine trying to use a cylindrical square to square
the Z-axis of a mill side-to-side when the axis is visibly off-square in the
front-to-back direction.
-Kevin Martin