Die casting allows for the creation of complex geometries with high precision and excellent surface finishes, which significantly reduces the amount of material that needs to be removed during machining. This not only shortens machining time but also minimizes material waste, enhancing overall production efficiency. Additionally, since die cast parts often require minimal machining on selective areas rather than the entire surface, the process becomes more cost-effective. When machining die cast parts, it is essential to consider their specific characteristics, such as the presence of inherent porosity and varying thermal expansion rates, which can affect dimensional stability and surface integrity. Proper tool selection and machining parameters must be carefully managed to avoid issues like burr formation and to ensure tight tolerances are maintained. By addressing these factors, CNC machining of die casting raw parts can achieve high-quality, precise components tailored to complex designs with optimized manufacturing workflows.
To determine whether a dimension needs to be machined, please check the table below for what is achievable by just casting
Aluminum CT5～CT7 Zinc CT4~CT6
| Base Dimension (mm) |
Achievable Dimensional Tolerance(mm) |
| From |
to |
CT4 |
CT5 |
CT6 |
CT7 |
| — |
3 |
0.20 |
0.28 |
0.40 |
0.56 |
| 3 |
6 |
0.24 |
0.32 |
0.48 |
0.64 |
| 6 |
10 |
0.26 |
0.36 |
0.52 |
0.74 |
| 10 |
16 |
0.28 |
0.38 |
0.54 |
0.78 |
| 16 |
25 |
0.30 |
0.42 |
0.58 |
0.82 |
| 25 |
40 |
0.32 |
0.46 |
0.64 |
0.90 |
| 40 |
63 |
0.36 |
0.50 |
0.70 |
1.0 |
| 63 |
100 |
0.40 |
0.56 |
0.78 |
1.1 |
| 100 |
160 |
0.44 |
0.62 |
0.88 |
1.2 |
| 160 |
250 |
0.50 |
0.70 |
1.0 |
1.4 |
| 250 |
400 |
0.56 |
0.78 |
1.1 |
1.6 |
| 400 |
630 |
0.64 |
0.90 |
1.2 |
1.8 |
Flatness Tolerance
| Base Dimension (mm) |
Achievable Tolerance (mm) |
| ～63 |
0.10 |
| ＞63～100 |
0.15 |
| ＞100～160 |
0.20 |
| ＞160～250 |
0.30 |
| ＞250～630 |
0.40 |
| ＞630 |
0.60 |
Geometric?Tolerance (true position, Parallel, Perpendicular, runout)（mm）
| Base Dimension (mm) |
Both in the same half of the mold |
Measured Dimension in different half of the mold |
| Both Not Move |
One Move |
Both Move |
Both Not Move |
One Move |
Both Move |
| Achievable Tolerance (mm) |
| ≤25 |
0.10 |
0.15 |
0.20 |
0.15 |
0.20 |
0.30 |
| ＞25词63 |
0.15 |
0.20 |
0.30 |
0.20 |
0.30 |
0.40 |
| ＞63词100 |
0.20 |
0.30 |
0.40 |
0.30 |
0.40 |
0.60 |
| ＞100词160 |
0.30 |
0.40 |
0.60 |
0.40 |
0.60 |
0.80 |
| ＞160词250 |
0.40 |
0.60 |
0.80 |
0.60 |
0.80 |
1.00 |
| ＞250词400 |
0.60 |
0.80 |
1.00 |
0.80 |
1.00 |
1.20 |
| ＞400词630 |
0.80 |
1.00 |
1.20 |
1.00 |
1.20 |
1.40 |
| ＞630 |
1.00 |
— |
— |
1.20 |
— |
— |