Homebrew PCBs

On Mon, 31 Dec 2012 11:56:48 -0700, you wrote:

>>There used to be a small tool that was used to create an island around
>>a drill hole. it was effectively a micro sized hole saw. The
>>technique was to drill holes in copper clad where you wanted them,
>>isolate this hole with the tool (as needed) and then bridge from
>>island to island with the parts.
>
>I've seen boards built with this. Usually the pre-drilled proto board, but
>with copper tracks that run from one edge to the other, and you separate
>the rows into smaller sections with the little hole saw, but I've never
>seen the tool. Have any info on it?
>

I had one somewhere, I think that OK electronics made it.  It cut an
island about 3/16 of an inch in diameter, with about 0.050 or so worth
of isolation.  Very small hand operated (as in wooden handle) hole
saw.

I think it dates from about the 1960's to roughly 1975 or so, as a
guess.

You could make one rather easily.  Steel tube filed for teeth, insert
with a small drill in it, or pin.  Mount in drill press with a stop to
keep from going too deeply into the board.  

Nothing spectacular, you could make one with just two teeth on it, and
in a drill press, I suspect it would work just fine.

Harvey

>
>On Sun, Dec 30, 2012 at 3:54 PM, Harvey White <madyn@...>wrote:
>
>> **
>>
>>
>> On Sun, 30 Dec 2012 20:16:03 -0000, you wrote:
>>
>> >
>> >What I am after, is an innovative way to build a circuit, without much
>> complications ,drilling, designing etc.
>> >
>> >Probably my best choice is a ready made copper board with small isolated
>> anchoring islands, similar to a type of vero board, but with no holes, so
>> they are stronger ! They are very good for RF, my main concern. I have seen
>> them somewhere, so I will start hunting !!
>>
>> There used to be a small tool that was used to create an island around
>> a drill hole. it was effectively a micro sized hole saw. The
>> technique was to drill holes in copper clad where you wanted them,
>> isolate this hole with the tool (as needed) and then bridge from
>> island to island with the parts.
>>
>> You've probably seen that one and decided it's not what you want. A
>> similar approach would be to use a dremel as a router, make a small
>> template that is large enough to manage, and has various patterns in
>> it, then use the dremel as a router to remove the copper around that
>> island. Never seen anyone do this, but it would have an advantage
>> that you could make templates of your favorite circuits with a sheet
>> of scrap aluminum, isolate as needed, (no through holes required) and
>> have essentially the same layout each time.
>>
>> you'd have to be somewhat careful with the depth setting, but a small
>> fixture could be made to allow you fast setup.
>>
>> Harvey
>>
>>
>> >
>> >Paul
>> >
>> >
>> >Probably the best that suits me is a ready made copper
>> >--- In Homebrew_PCBs@yahoogroups.com, Mitch Davis <mjd@...> wrote:
>> >>
>> >> On Mon, Dec 31, 2012 at 2:11 AM, AlienRelics <alienrelics@...> wrote:
>> >> > This all sounds more and more complex.
>> >>
>> >> Indeed. But some people are like that.
>> >>
>> >> > What is wrong with toner transfer, direct inkjet resist, or
>> scratch-and-etch?
>> >> > Or isolation milling in a CNC mill?
>> >>
>> >> Nothing at all (but he didn't ask about them, he asked about hand or
>> >> machine tools for scratching the surface of a copper board).
>> >>
>> >> Paul, you'd probably get better ideas if you shared with us what
>> >> you're trying to achieve :-)
>> >>
>> >> Mitch.
>> >>
>> >
>>
>>  
>>
>
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