Re: [CAD_CAM_EDM_DRO] Tramming the Head

Ian Wright wrote:

> Easy way to tell how true the head is - get a piece of stiff wire and bend
> one end up, the other down like so:
> |
> |
> |_______________
> |
> |
> |
> Hold the top end in the chuck / toolholder and bring the other end down to
> just above the table. Now rotate the chuck slowly by hand and you will see
> quite easily whether the head is at right angles to the table. To put
> 'figures' to it, arrange a dial gauge on a bent rod in the same way. Use as
> long a horizontal section as your table will allow so it magnifies the
> errors. I've seen old timers set up big milling machines this way using
> feeler strips under the end of the wire to check when they got things
> exactly right.

The wire you describe is a version of a trammel point, from which the
phrase "tramming the head" comes.

Here's a link to a very nice one:

http://www.smtco.com/trammel.htm

Matt