pieces are the fact that they use very small metric screws,
so I placed some threaded holes to use them with 6-32
We do this with a very simple tool called a tap. A tap is
used to cut the female threads into a hole. Each particular
tap has a matching hole size that is needed. Because these
sizes tend to fall in between normal drill bit sizes, you have
to purchase special bits. For instance, a 6-32 tap requires a
#21 drill bit for the hole. You often can purchase both the
tap and drill bit together for a couple of dollars. You will need
a small holder for the tap like the one shown in Figure 12.
Because I am often tapping holes in my various projects,
I purchased a complete set like the one shown in Figure 13.
Let’s start by drilling the holes into the frames. Use
the holes indicated by the arrows shown in Figure 14. The
OF-64S frame holes are already the perfect size so we don’t
need to drill them. The holes in the OF-RX28S are too small
so those will need to be drilled out with a #21 bit.
Using the tap, cut the threads into the holes you just
drilled. When tapping the holes, try to keep the tap as
SERVO 09.2008 39