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 The following information should always be on the casting drawing:
+ Material - Alloy specification and heat treatment.
+ Tolerances - General and specific tolerances for liner tolerances, flatness and straightness, concentricity, angularity, parallelism and perpendicularity.
+ Fillet and corner radii - Specified as a maximum condition only, so tool makers can eliminate outside radii to facilitate tool construction and reduce cost.
+ Location and amount of machine stock.
+ Surface finish.
+ Casting identification -description and location.
Premium tolerances require additional operations at extra cost and achieve closer tolerances on selected dimensions only. It is recommended that your design in accordance with the configuration below, however even tighter tolerance than those on the following chart can be obtained.
The technical ability of ARC Investment Casting is growing so rapidly that we present an extension of the list as a guide for larger configurations. Always keep in mind that your specific configuration and the alloy are the most important criteria in determining dimensional variation from part to part during production.
The ultimate success of the casting design depends on the communication between the designer and foundry engineers. When the foundry is properly informed of part requirements, there is usually a compromise of specifications that will allow for maximum compliance to print specifications and finish part design.
Tolerance:
1.Concentricity:
External Diameter |
3/4" |
1" |
1 1/2" |
2" |
Inner Diameter |
1/4" |
1/2" |
3/4" |
1" |
TIR Eccentricity |
0.008 |
0.010 |
0.010 |
0.016 |
2. Flatness and Straightness:
It should be remembered that flatness and straightness tolerances deal with bow only and should not be confused with surface irregularity.
Tolerances for flatness and straightness are 0.003---0.0055"/1" and depend on alloy and configuration of casting.
3. Radii:
General Tolerance: 0.016"/1"
Limit Tolerance: 0.005"/1"
4. Angular Tolerance: ≤0.50°
5. Roundness:
Diameter: 1/2”.....1" .......1 1/2"
Roundness Tolerance TIR: 0.010...0.016... 0.024
Allowable tolerance after corrective action:
External Diameter: 1/2”.....1" .......1 1/2" .......2"
Roundness Finished TIR: 0.006...0.008...0.010 ...0.015
6. Hole Tolerance:
Best tolerances for holes are as follows:
Hole Diameter |
Limit Tolerance |
~ 0.25" |
0.003〞/1〞 |
~ 0.5" |
0.004"/1" |
> 0.5" |
0.005"/1" |
These tolerances apply to round holes, D-holes and square holes.
7. Recommended Tolerances:
For all functional dimensions, the linear tolerance table below should be used.
For non-functional dimensions, wider casting tolerances will result in a more economical design.
Inches |
Millimeters |
Dimensions |
Tolerance |
Dimensions |
Tolerance |
---0.250 |
±0.005 |
----3 |
±0.100 |
0.250---0.500 |
±0.006 |
3--------6 |
±0.125 |
0.500----0.750 |
±0.007 |
6--------10 |
±0.150 |
0.750----1.250 |
±0.008 |
10-------18 |
±0.180 |
1.250----1.750 |
±0.009 |
18-------30 |
±0.200 |
1.750----2.500 |
±0.010 |
30-------50 |
±0.230 |
2.500----3.500 |
±0.012 |
50-------80 |
±0.260 |
3.500----5.000 |
±0.013 |
80-------120 |
±0.300 |
5.000----7.000 |
±0.014 |
120------180 |
±0.350 |
7.000--10.000 |
±0.016 |
180------250 |
±0.400 |
10.00—16.000 |
±0.017 |
250------400 |
±0.430 |
16.00---25.000 |
±0.018 |
400------630 |
±.0460 |
25.00---40.000 |
±0.020 |
630------1000 |
±0.500 |
8. Wall Thickness Dimension Tolerance is exceptional, conforms to ISO 8062-1996
Overall Dimension (mm):
Not more than 1400X600X600
Materials:
Stainless Steel ,Carbon Steel, Aluminum Alloy, Copper Alloy, Ni-base Alloy, Co-base Alloy, and Other Steels.
Quality Standards:
American ICI, MIL, Chinese HB963-90 and other Standards. Castings should be used at the request of customers.
The lead time for mould and sample
Samples will be supplied in 4---6 weeks according to the complexity of product.
Weight:
5g-40kg
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