Re: [CAD_CAM_EDM_DRO] Cnc PCB drilling machines z axis linear pot

Hi, well the drilling part is a matter of getting thru the last
pcboard,sometimes they drill many boards at once. most of the carbide
tooling from that industry has plastic rings on the shank. i suspect they
use that for a depth setting for tool changes. cul brian f.

----- Original Message -----
From: <JanRwl@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Sunday, December 09, 2001 11:21 PM
Subject: Re: [CAD_CAM_EDM_DRO] Cnc PCB drilling machines z axis linear pot


> In a message dated 09-Dec-01 08:31:18 Central Standard Time,
> byron@... writes:
>
>
> > Is there any advantage of using this potentiometer. . . .
> >
> > Look forward to the groups views on this
>
> Byron: Advantage? It's electrically simpler than just about any other
kind
> of encoder, and as ALL PCB holes are "THRU-holes", depth-precision is not
a
> factor.
>
> MY home-brew machine uses only "Microswitches" for "fully-down" and
> "fully-UP, again", and they are perfectly fine for the purpose.
>
> One detail: I have only seen "professional, 4-quill CNC PCB
> drilling-machines" from four feet away, and I didn't stay to get FR-4 dust
in
> my face, so I have no clue how those machines "tell" how deep to "chuck
up"
> bits, when they change bits, automatically (that's sumpin to see!).
Wonder
> how "accurate" (repeatable) that is, and how "indexed"???
>
> Anyone reading this know????? Jan Rowland
>
>
> [Non-text portions of this message have been removed]
>
>
> Addresses:
> FAQ: http://www.ktmarketing.com/faq.html
> FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/
>
> Post messages: CAD_CAM_EDM_DRO@yahoogroups.com
> Subscribe: CAD_CAM_EDM_DRO-subscribe@yahoogroups.com
> Unsubscribe: CAD_CAM_EDM_DRO-unsubscribe@yahoogroups.com
> List owner: CAD_CAM_EDM_DRO-owner@yahoogroups.com, wanliker@...
> Moderator: jmelson@... timg@... [Moderator]
> URL to this page: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO
> bill,
> List Manager
>
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>
>
>