technical
premium grade investment casting by the 'lost wax process'
Cast material
Please click on the links below to open PDF documents:
Tolerances and sizes
Information contained within this section is subject to our disclaimer. You are invited to discuss your particular requirements with us.
commercial grade investment casting
This is a new process to the UK and offers distinct advantages over premium grade investment castings and sand castings, the advantages are:
Cast material
- Grey iron
- Ductile iron
- SG Iron
- High Chrome Iron
- White irons
- Carbon Alloy Steels
- Process capabilities
- Cast surface roughness for example 0.2% Carbon steel 12.5-25.4RA
- Minimum and maximum weight limitations From 10g to 100kg
- Minimum and maximum size limitations .100mm – 1000mm
- Draft angles required per process +/-1-3 degrees
Tolerances and sizes
Size of casting mm |
+/- Tolerances mm |
- |
10 |
0.52 |
10 |
16 |
0.54 |
16 |
25 |
0.58 |
25 |
40 |
0.64 |
40 |
63 |
0.7 |
63 |
100 |
0.78 |
100 |
150 |
0.88 |
150 |
250 |
1.25 |
250 |
400 |
2.00 |
Please note: The above tolerances can vary dependant on shape and material.
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sand casting
Cast material
- Grey iron
- Ductile iron
- SG Iron
- High Chrome Iron
- White irons
- Low Carbon Alloy Steels
- Aluminium Alloys
- Copper based alloys
Tolerances and sizes
Size of Casting mm |
Tolerances mm |
> |
< or = |
Green Sand & Vacuum |
Resin Sand |
|
10 |
2 |
1 |
10 |
16 |
5 |
1 |
16 |
25 |
2 |
1 |
25 |
40 |
2 |
1 |
40 |
63 |
2 |
1 |
63 |
100 |
2 |
2 |
100 |
150 |
3 |
2 |
160 |
250 |
3 |
2 |
250 |
400 |
3 |
2 |
400 |
530 |
4 |
3 |
630 |
1,000 |
4 |
3 |
1,000 |
1,600 |
5 |
3 |
1,600 |
2,500 |
5 |
4 |
2,500 |
4,000 |
6 |
4 |
4,000 |
6,300 |
7 |
|
6,300 |
10,000 |
|
|
Please note: The above tolerances can vary dependant on shape and material.
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gravity die casting
Cast material
- Aluminium alloys
- Zinc alloys
- Copper based alloys
Capacity
- Machine capacity – 125 – 800 tons
- Batch sizes is dependant on casting size, minimum is 3000 pieces, but typically the batch sizes are 5000 upwards
Tolerances
- Aluminium alloys 5 - 7
- Zinc alloys 4 - 6
- Copper 6 - 8
Size of casting mm |
Tolerances |
|
|
4 |
5 |
6 |
7 |
8 |
- |
10 |
0.26 |
0.36 |
0.52 |
0.74 |
1 |
10 |
16 |
0.28 |
0.38 |
0.54 |
0.78 |
1.1 |
16 |
25 |
0.3 |
0.42 |
0.58 |
0.82 |
1.2 |
25 |
40 |
0.32 |
0.46 |
0.64 |
0.9 |
1.3 |
40 |
63 |
0.36 |
0.5 |
0.7 |
1 |
1.4 |
63 |
100 |
0.4 |
0.56 |
0.78 |
1.1 |
1.6 |
100 |
160 |
0.44 |
0.62 |
0.88 |
1.2 |
1.8 |
160 |
250 |
0.5 |
0.72 |
1 |
1.4 |
2 |
Please note: The above tolerances can vary dependant on shape and material.
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finishing
Machining
photo here |
|
| Brief Overview |
Sub assembly
 |
|
| Brief Overview |
Heat treatment
photo here |
|
| Brief Overview |
Mechanical polish
 |
|
| Brief Overview |
Electro polish
 |
|
| Brief Overview |
Paint
photo here |
|
| Brief Overview |
Plate
photo here |
|
| Brief Overview |
Shot blast
 |
|
| Brief Overview |
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