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- Newsgroups: sci.electronics
- Path: sparky!uunet!zaphod.mps.ohio-state.edu!caen!uvaarpa!vdoe386!norfolk!fculpepp
- From: fculpepp@norfolk.vak12ed.edu (Fred W. Culpepper)
- Subject: Re: 0.100" spacing
- Message-ID: <1992Jul26.194825.17099@norfolk.vak12ed.edu>
- Organization: Virginia's Public Education Network (Norfolk)
- References: <1992Jul24.135835.21402@cci632.cci.com>
- Date: Sun, 26 Jul 92 19:48:25 GMT
- Lines: 52
-
- adw@cci632.cci.com writes:
- >
- > Thanks to all who replied to my question of the green solder mask. The
- > green stuff is silkscreened and isn't really necessary for homebrew
- > circuit boards. However, several varnishes exist that will insulate the
- > board. One of them is a red varnish from GC Electronics, and other kinds
- > are clear and comes in a spray. Radio Shack doesn't sell something like it
- > so you will need to look elsewhere.
- >
- >
- > Now, I have another question! Previously, I've been drilling holes for my
- > IC's with a drill press, which isn't so bad for the small 16 pin IC's.
- > I can usually eyeball where the drill press will drill with reasonable
- > accuracy, and any variation can be compensated by bending the pins of the
- > IC socket or IC to fit.
- >
- > However, I have a 64 pin IC that I want to put on a circuit board. I don't
- > wish to have to get a stronger eyeglass prescription after drilling the holes.
- > So does anyone have any techniques or equipment that they use to drill these
- > types of things?
- >
- > My fantasty drill press accessory is a X-Y sled that fits on the bench of the
- > drill press. This sled would have clips that my circuit board attaches to. When
- > I twist some screws, the sled locks, and when I push it in an X or Y direction,
- > it clicks and locks at every 0.100". Does such a thing exist, or will someone
- > take this idea, make a fortune selling these sleds, and give me a free sled
- > in exchange?
- >
- >
- > Any tips or pointers would be deeply appreciated.
- >
- > Derrick
-
- Derrick,
-
- Radio Shack has an answer to your problem (or rather it
- does for me). I purchased a pre-drilled circuit board to use
- as a template. First step is to used the template to mark the
- positions of the holes where wanted. Second step, use a
- *small* center punch and tap it slightly to produce a dimple in
- the surface of the copper foil. Third step, use the drill.
-
- The dimple will guide the drill to the proper
- position. It may take a bit of practice to discover how much
- hammer blow will produce the optimum dimple. But it works and
- the results are a neat line of propely positioned holes.
-
-
- Fred Culpepper
-
- fculpepp@norfolk.vak12ed.edu
- --
-