Recent content by UnkleFuzzy

In a real life blower, the lobe would not have that sharp edge at that point but would have a smooth transition between the concave and convex curves. Here is an overhaul manual for a full sized blower. The tolerances can probably be extrapolated to the scale you need...

"Coal Dust", or Seacoal in the industry vernacular is used primarily as a plasticizer at the metal/mold interface. It becomes flexible at high mold temperatures and allows the mold to give, rather than crack from thermal shock. The Seacoal also burns out during the pour and causes the surface...