*It is recommended to contact us to ensure that the dimensional details are healthier.
Not: It is advised to use Standard Linear Tolerances for functional part dimensions
Special Linear Tolerances
Advised Techniques iflinear tolerances are required:
i ) Re-design the product with additional bars, brackets and gussets
ii) Adjusting wax injection wax to the nominal dimensions after the prototype
iii) Flatness and Straightness
iv) Jigging and manual straightening
vi) Other secondary treatments
Premium tolerance practicability should be checked for each diemension of each part.
Depending on the lenght, Parts can be casted straight and flat within 0.10 mm tolerance.
For thicker parts this tolerance can be up to 0.25 mm.
Hole profile is within Standard Linear Tolerances. When required, Premium Linear Tolerances can be applied.
If possible, it is advisable to apply General Linear Tolerances.
The gap between the centers of two cylindrical surfaces -which are sharing a common point or an axis as their center-, is not more than the gap between their diameters multiplied by 0.10 mm.
If the height of a cylinder is more than two times of its diameter Straightness Tolerance should be added to eccentricity.
As a standard rule, +/- 0.5 degrees or +/- 0.02 of the length is a normal tolerance for production.
For some cases, Angular Tolerance can go down to +/- 0.25 degrees or go up to +/- 1.0 degrees
|30 mm – 100 mm||30||0,87||20||0,57|
|100 mm – 200 mm||30||0,87||15||0,44|
|200 mm’den fazla||20||0,58||15||0,44|
Cast Characteristics – General Rules
By using ceramic core, hole length can be increased to 30 x hole diameter.
Hole Length=Hole Diameter
Counterbores / Grooves
Blind grooves can be casted up to 1.5 x width
Wall Thicknesses / Corner Radius (Radii)
Minimum Wall thikness and Corner Radius depends on the configuration and the dimensions of the part. In some casts, it is possible to have 0.3mm Wall Thicknesses and R 0.3mm Corner Radius.
Standart Surface Roughness in Investment casting is 125 RMS (Ra3.2-6.0). It is possible to improve Surface Roughness by using secondary methods and treatments.
For each section, one or more Runners with a thicker cross-section are used. After solidification, these Runners are removed by Grinding.
Internal Radii, Fillets
Internal radii and fillets improve the strength and integrity of the casting and minimise internal stresses. It is advisable to increase Internal Radii
Engraving should be raised letters on a recessed pad, so the top of engraving is below the surface of the part which is easier, more economical and without any defects.
Metallurgical and Visual Quality Requirements
Design, Material Type, Heat Treatment and Visual details should be discussed and decided between Customer and Cevik Technical Metallurgy.
All other requirements should be discussed and clarified together with our Technical Team before Order and Production
Dont hesitate to contact us about dimensions tolerances.