MIM Tolerance
First of all, let us explain what is called engineering Tolerance.
Tolerance is the allowable deviation of the measured value from the base measurement. Using tolerances helps ensure that the final product is easy to use,
Tolerances can apply to many different units. In industrial production, we mostly talk about tolerances that apply to linear, angular, and other physical dimensions.
However, regardless of the units used, the tolerances on the drawing represent the acceptable measurement range from the base point (nominal value).
In the absence of a specified allowable tolerance, the manufacturer tries to stay close to this value, which we call the standard tolerance, but there will be some deviation due to machine capabilities, settings, machinist capabilities, etc. The deviation is usually divided into upper deviation and lower deviation
for example
Drawings state that 9.75 is the minimum acceptable size and 10.25mm is the maximum. So the total “room for error” is still the same – 0.5mm – but it can deviate from the nominal value by 0.25mm.
So it is acceptable to produce parts that fit in the 9.75 to 10.25 mm range.
The MIM tolerance s the tolerance value for metal injection molding, which can be achieved after the injection and sintering process. and the MIM tolerance usually achieved is +/-0.3% (ie 1.000” +/-.003”).
Metal Injection Molding Tolerance And Limits
The usual metal injection molding tolerance ranges are as table：
However, due to various factors such as different materials, different designs, different structures of MIM parts, mold structure, parting line position, gate position, etc., in the actual production process, the tolerance may be less than or greater than +/-0.3% range.
JH MIM can do CNC processing in the later stage to ensure the design tolerance of the drawing,
