In a previous post I stated that I had a set of bits that were designed specifically for this purpose. I dug the kit out of my PCB toolkit and have the following information. Note: The reference to the company that made the kit yielded only one reference on Google and a post on kkn.net archives which are password protected. It seems assured that the company no longer exists:
A. F. Stahler Co. PO Box 354 Cupertino, CA 95014 (408) 252-4219 4 part kit consists of 4 plastic vials. 1) Part Number 156915 - a single "drill mill" shank dia. .200, mill end dia. .150, concentric drill dia. .028 2) Part Number 156910 - a single "drill mill" shank dia. .200, mill end dia. .108, concentric drill dia. .028 3) Part Number 156920 - a single "drill mill" shank dia. .200, mill end dia. .200, concentric drill dia. .028 4) No PN contains 3 spare diamond drills .028 dia. and about a dozen nylon hex head screws, abt #4 x 1/8" long The purpose of the nylon screws is to drill into a PCB and insert then dril thru hole in nylon to create an insulated standoff or feedthru. My recollection was that A F Stahler was or may have been a ham who did a lot of building and back in 1970s he provided the tools as a method of breadboarding. He may also have been an antenna designer with many patented designs. This may be more significant: one of the items I found in my toolkit was a similar device that is/was made by VECTOR. As may be recalled they manufactured a breadboard system that employed vector board which had a grid of holes where you could push in a small metal clip that was sometimes referred to as a "flea clip". it had a couple small holes in it and could also daisy chain buss wire and component leads in a serrated slit on top. Spreading the slit slightly secured it in the vectorboard. It was solderable, but a circuit could be created by purely mechanical pressure fit. They advanced to the aid of PCB breadboarding later and supplied what I have is a VECTOR P-138 bit. _http://www.vectorelect.com/Catpdf/Page%2071.pdf_ (http://www.vectorelect.com/Catpdf/Page%2071.pdf) If you drilled a hole in a blank copperclad board there is a pilot pin on the bit that would go in the hole and by turning bit in a small drill it cuts a "doughnut" shaped pattern on board. The URL shows an array of tools - also check out the home page for a vast array of prototyping tools and materials. Sold by Mouser and others _http://www.vectorelect.com/_ (http://www.vectorelect.com/) Good Luck, AL WA6VNN ************************************** Get a sneak peek of the all-new AOL at http://discover.aol.com/memed/aolcom30tour _______________________________________________ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
