In my community college jewelry class, we are attempting to
make diamond drill bits and could use assistance. <<
You didn't say if the purpose of your erxercise was to develope
was to ma ke diamond tools or if you had a job that required a
special diamond tool to complete.
I'll assume you needed a special tool to complete some job. You
can buy many kinds of plated diamond tools a lot cheaper than you
can make them (faster too).
If, for instance, you need a diamond bit to drill a hole in a
rock, get a piece of copper or brass wire or tube a little
smaller than the diameter of the hole desired. For larger holes
the tubes work better. Coat the end o f the wire with vaseline
(diamond has a great affinity for oily/grease items). Sprinkle a
very little diamond grit on a smooth surface. Roll the greased
end of the wire through the grit. Only about 1/8 - 1/4 inch of
th e tip needs to be diamond coated. Use modeling clay or putty
to build a small dam, about 1/2 inch diameter, around the area to
be drilled. Start to drill the hole. After the holer is started
just enough to keep the drill from wandering, put some water in
Check your progress often to allow the bit & hole get water.
You may nee d to add more diamond grit from time to time.
If you want to make a flat lap with diamond, start with a
relatively soft metal such as copper. Sprinkle the selected
diamond grit over the surface as evenly as possible. The entire
surface doesn't have to be covered, but the coverage should be
uniform. Use a hard steel roller (an old steel bearing works
good) to press the diamond grit into the copper. Keep a steady
drip of water on the lap when it's in use.
Depending on your requirements most any soft metal (something
the diamon ds can embed in that will hold them after being
embedded) will work. For flat laps you can even use plastics.
Commercially, diamonds are polished on cast iron scaifes (flat