Re: [CAD_CAM_EDM_DRO] Wigglers and Tricks

Hi,

Model Engineer in the UK ran an article earlier this year about making such
a device. It mounted in the spindle of a miller or the tail-stock of a lathe
and could pick up a point or an edge with very high accuracy. If I can find
the magazine I'll post where a copy can be found. This is the only one I
kept back from Bill:-)

Regards,

Terry

> Joe,
>
> An optical center punch? is this to align the spindle or to punch the
> intersection of scribed lines? I started to think there was a
> "periscope" type device that chucked up in the collet, and "peered" down
> at the work, giving some sort of alignment gradicule. I wonder if
> something like that would be practical? I have a "bomb site" for an old
> HP 7475, etc. plotter; if one could add a mirror at 45deg., and mount
> the whole thing, it might be useful.
>
> Maybe the ball end wigglers find the center of a drilled/bored hole? I
> finally saw/read up on the "tophat" (?) centerfinder in Rudy's
> tapes/books (I can't remember which).
>
> I saw OMW's "Center Test Wobbler" (for lathe) at the P.R.I.M.E. show,
> but at $30 plus shipping, I thought I might make one, when I need it. I
> still wonder if the long needle is bent a little, will it still be
> accurate? I examined one on the table, and it didn't seem to be true.
> Maybe it doesn't matter?
>
> Alan