Pure aluminum is poured into a sand mold. The metal level in the pouring basin is 250 mm above the
metal level in the mold, and the runner is circular with a 10-mm diameter. What are the velocity and
rate of the flow of the metal into the mold? Is the flow turbulent or laminar? The viscosity of pure AL
at 700 ˚C is 0.0015 Ns/m2.
For the sprue described in Problem 10.50, what runner diameter is needed to ensure a Reynolds
number of 2000? How long will a 330 cm casting take 3 to fill with such a runner?
The component, shown in Figure 1 below, need to be machined to a precision static fit. Show, with a
drawing, the designation of the fit and determine the maximum and minimum allowable diameters.
Shaft designation: h6
Hole designation: H7
What would the designation, min and max diameter for the hole be?
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