| Materials
and dimension tolerance |
| |
| C
& S casting materials reference: |
A
wide range of ferrous metals can be selected. Produced to specifications
and standards according to the ASTM, DIN, JIS,etc.
If you have a specific alloys of which does not appear below, please let
us know, we shall meet your needs. |
| |
| Alloy
category |
Examples |
| Stainless
steels |
3xx
Austenitic, 4xx series hardenable, Duplex stainless, etc. |
| Carbon
steels |
10xx
series, 11xx series, 12xx series, 15xx series, |
| High
alloy steel |
13xx
through 97xx series |
| Tool
steels |
W
series, S series, O series, A series, D series, H series. |
| Nickel
based alloy |
Hastalloys,
Monel, Inconels. |
|
| |
| Casting
dimension tolerance reference |
| Castings
will not be perfect as the tooling have tolerances and the wax pattern have
tolerances, however, they can be predicted. Some typical lost wax casting
dimensional tolerances are described as follows . |
| |
| Casting
dimension |
General
tolerance |
Specific
tolerance |
| 2-10mm |
+/-0.25mm |
+/-0.14mm |
| 10-25mm |
+/-0.3mm |
+/-0.25mm |
| 25-50mm |
+/-0.4mm |
+/-0.32mm |
| 50-75mm |
+/-0.6mm |
+/-0.5mm |
| 75-100mm |
+/-0.8mm |
+/-0.7mm |
| 100-125mm |
+/-1.1mm |
+/-0.9mm |
| 125-150mm |
+/-1.4mm |
+/-1.1mm |
| 150-175mm |
+/-1.7mm |
+/-1.3mm |
| 175-200mm |
+/-2.0mm |
+/-1.5mm |
| 200-250mm |
+/-2.5mm |
+/-1.8mm |
|
| |
| Surface
roughness: |
| Typical
surface roughness is 125rms-250rms. |
| |
| Concentricity
and roundness: |
| Out
of round is the radial difference between a true circle and the cast surface
diameter, |
| Hole
diameter |
deviation |
| Up
to 12mm |
+/-
0.08mm |
| 25mm |
+/-
0.13mm |
|
| |
| Parallelism: |
| parallelism
is relative planar measurement with respect to a datum plane, nominal difference
is 0.25mm per 25mm dia. plane. |
| |
| Radius: |
| Please
try to avoid sharp edges, r=1mm is nominal for the CAM tooling. |
| |
| Weight
and size: |
