Dal-Air investment casting specifications are detailed below:
| Typical surface finish | 125 RMS Avg | |||
| Blasted finish available | Steel Shot, Aluminum Oxide, Stainless Steel Shot | |||
| *Testing available | Chemistry, Test Bar Mechanicals, Charpy Bar | |||
| Hardness Testing | ||||
| *NDT testing available: | Penetrant Inspection (Zyglo) Magnetic Particle Inspection X-Ray |
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| *Available at an extra cost | ||||
| Linear Cast Tolerances | ||||
| Standard tolerances | ±.007”/first inch and ±.005” each additional inch | |||
| Hole size tolerance | ±.005”/inch typical | |||
| Premium tolerances | ±.005”/inch | |||
| Standard flatness, straightness, parallelism, perpendicularity, concentricity tolerances | .005”/inch | |||
| *Premium flatness, straightness, parallelism, perpendicularity, concentricity tolerances | .003”/inch |
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| *Premium tolerances available at extra cost | ||||
| Hole depth features | Through holes depth in relation to the diameter or width. Smaller holes (<.1.00″) may be limited to a 2/1 ratio whereas larger holes (>1.0″) may provide up to a 3/1 depth to width ratio. Blind holes and slots require large fillet radii at the base and half of the depth to width ratio required. | |||
| Minimum wall thickness | .060-.090″ | |||
| Typical machine stock requirements | >63rms surface finish and > ±.003”: .030″/side <63rms surface finish and < ±.003”: .060”/side |
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| Outside processes available | Heat Treatment Painting/Powder Coat/Plating Machining |
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