By means of a written calculation, conceive and model the rack
and pinion mechanism for the necessary vertical displacement of the
drill bit:
-Sets the geometry of the pinion and rack: pinion dimensions,
rack dimensions, # of teeth in each element, diametrical pitch,
linear pitch, unit displacement of the rack, etc.
-Sets the geometry of the crank: # arms, length.
-Sets the connection geometry of the crank to the pinion.
-Set the geometry of the zipper with the broker's shirt.