Our experienced staff has the skill needed to work with you from the initial design stage all the way through the completion of your project. Keep in mind, during the initial design stages, that alumina shrinks approximately 20% during firing. This means the more complex the part design becomes the harder it is to hold tolerance stability. Simpler designed parts can be produced more uniformly, i.e. green pressed density and sizes can be controlled. A more uniform green density means that tighter tolerances can be held.
Tighter tolerances cost more during manufacturing, geometric tolerances look nice on the drawing, but if they are not necessary they will cost more during manufacturing and then cost you more during inspection. Even though it is easier to hold tighter tolerances on small parts, small I.D.s can cause excessive tool breakage. Wall thickness should be kept to approximately 10% of O.D. or a minimum of .020″ when possible. This includes the distance between the holes as well as the distance from the I.D. to the O.D. Depth of blind holes should not be greater than 50% of the overall length.
There should be as few steps or levels as possible in your new design. Multiple levels cause areas of compaction that may result in changes in green press density. These changes in density may cause the fired part to be porous and may also result in shrinkage differences causing the dimensional stability to be affected.