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

On Sun Dec 9 20:21:11 2001, JanRwl@..., <JanRwl@...> wrote:

>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

Not a clue, but not _all_ PCB holes are through holes. Some traces run only on
the top side, or down to layer(N).

Bill

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