Re: [CAD_CAM_EDM_DRO] Finding Z zero for CNC

Create a simple electrical circuit - constant known thickness plate, put on
top of the work(or at known z position), with cable attached. Attach another
cable to the tool, then add a battery and a light bulb in series between the
two cable and you are done. Only when the tool actually touches the plate
will the circuit be complete.

Simple , and should be accurate.

Scott Ellis
Manager
Novatex Research - Excellence in Electronic Research & Development
scott.ellis@...
41 Yule Road, Merewether, Newcastle, NSW 2291, Australia
Ph 0412 988408, 02 49633633 Fax 02 49636058

----- Original Message -----
From: "Art Eckstein" <axtein@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Monday, May 03, 2004 9:38 AM
Subject: Re: [CAD_CAM_EDM_DRO] Finding Z zero for CNC


> What I am doing, is a process of setting up a "portable" home switch in
> series with my normal limit/home switches.
>
> This switch will be set to some "known" Z distance, mostly Z=0, and then
> when I do a tool change, I will simply home the tool to this switch.
>