Investment Casting Hole Tolerance


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Aerospace Castings Military Castings Precision Investment Castings Prototype Castings Aluminum Investment Castings Copper Alloy Investment Castings Search Precision Investment Castings All Any Exact	Request a Quote Upload Drawings Investment Casting Hole Tolerance A cast hole's roundness is affected by the surrounding metal. If an uneven mass is adjacent, the hole will be pulled out of round. If the surrounding metal is symmetrical, holes up to " diameter can be held to .005" based on a plug gage check. Larger holes may be affected by interior shrinkage or pulling, and the foundry should be consulted. The longer the hole or the more mass in the section around it, the more pronounced the effect. Figure 2 above shows the effect of hole shrinkage concavity which will be present to some extent in all castings. The top and bottom openings will be approximate dimensions, while the center diameter will retain their increase. Thru holes which require clearance and can be checked with a plug gage can be held to fairly close tolerances if the large diameter in the center is ignored. If the sidewalls of the hole are used as bearing surfaces, simple reaming will size the cast opening. Figure 3 above shows how a heavier section close to the hole distorts the shrinkage pattern. The hole diameter is distorted by the additional shrinkage of the heavier section. The figure graphically shows the pattern of distortion present to a greater or lesser degree in every casting with heavier mass affecting shrinkage. Questions about investment casting hole tolerances? Contact us today for all your investment casting needs.

Aerospace Castings \| Aluminum Investment Castings \| Angular Holes \| Angularity \| Copper Alloy Investment Castings \| Concentricity \| Contours, Radii, Cams Curved Holes \| Flatness (Dish) \| Hole Tolerance \| Internal Radii, Fillet \| Investment Casting Advantages \| Investment Casting Capabilities \| Military Castings Out of Roundness \| Parallelism \| Perpendicularity \| Precision Investment Castings \|Positioning \| Prototype Castings \| Roundness \| Standard Linear Tolerances Straightness \| Surface Textures \| Tapered Holes \| Variables \| Investment Casting Site Map Londonderry, NH Website Design Development Alcumet, Inc. is a leader in the production of aerospace castings, military castings, prototype castings, aluminum investment castings and beryllium copper investment castings. MA, Massachusetts, NH, New Hampshire, CT, Connecticut, RI, Rhode Island, VT, Vermont, ME, Maine, New England, USA