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 The tolerance in CNC (Computer Numerical Control) machining refers to the allowable deviation from the specified dimensions of a machined part. The achievable tolerance depends on several factors, including the type of CNC machine, the material being machined, the complexity of the part, and the machining operations involved. For most general - purpose CNC milling and turning operations on common metals like aluminum, steel, and brass, a typical tolerance is around ±0.005 inches (±0.127 mm). This level of tolerance is suitable for many industrial applications where moderate precision is required, such as the production of machine components, brackets, and simple fixtures.

The surface roughness of investment - cast parts can vary depending on several factors, including the type of investment material, the molding process, and the post - processing treatments. Generally, the surface roughness of investment - cast parts can range from Ra 0.8 μm to Ra 6.3 μm. Water glass casting can reach Ra6.3 , while silica sol casting can reach Ra3.2.

H13 steel is the most widely used die - casting mold material. It has excellent thermal conductivity, good toughness, and thermal fatigue resistance.

Draft angle is typically in the range of 0.5° - 3°.

Usually in line with DIN EN 12020-2 , and also with special key size tolerance.
It needs to check from batch to batch so that we can notice the mold is worn or not .