FIGURE 7. A
FIGURE 8. A
wire wrapping tool.
two holes at the end of a manual wire
wrap tool. Neatly wrap the posts, applying
precise wrapping tension. The most crucial
areas are the wire itself, the wrapping
method, and the wire wrap post. The
wire goes in the hole near the edge and
the post is inserted into the center hole.
although usually you only need one or two. This allows
you to manually repair your wire-wrapping later, if needed.
Figures 5 to 8 show a battery operated, an electrical, a
pneumatic, and a manual wrapping tool that you “squeeze.”
The Actual Wrapping Technique/Mechanism
Most hobbyists or students on a budget typically use
an inexpensive, manual wire wrap tool (see Figure 9). There
are wrapping, unwrapping, and all-in-one hand tools that
strip, wrap, and unwrap in one (see Figure 10). There are
FIGURE 9. A simple, manual handheld wire wrapping tool.
FIGURE 10. An all-in-one cutting, stripping, and wrapping tool.
Try to wrap one end of the wire on the lower side
of a wrap post with the other end on the high end of
another post. This is called the daisy-chain method (see
Figure 11). You most appreciate this technique when you
have to lift a wire off an IC pin, since using this method
never requires you to remove more than one wire. If you
made all the connections to a point on the bottom of the
wrap post, then you would have to remove a great
number of wires with resulting disorder and confusion.
The turn and a half of insulated wire helps keep the
wire from fatiguing where it meets the post. Above the
turn of insulated wire, the bare wire wraps around the
post. The corners of the post bite in with pressures of tons
per square inch, actually Mega Pascals (MPa).
Note: A Pascal is a pressure or stress equal to one
Newton per square meter. A Newton, in turn, is a force
producing an acceleration of one meter per second
squared on a one kilogram mass.
This forces all the gases out of
the area between the wire’s silver
plate and the post’s gold or tin corners.
Further, with 28 such connections
(seven turns on a four-cornered
post), a very reliable connection
exists between the wire and the
post. Furthermore, the corners of the
posts are quite “sharp” — quite the
opposite of being rounded off.
Wire Wrap Wire
FIGURE 11a. Placing the wire in a
wire wrapping tool.
48 June 2009
FIGURE 11b. Wrapping from
post to post in a daisy-chain fashion.
Wire wrap wire comes in several