Dish Investment Castings | Wax Casting


	Home	About AlCuMet Capabilities Employees Facility Press Room Privacy Quality Commitment Casting Alloy Charts Aluminum Based Copper Based Casting Process Online Tour Technical Info Advantages Angular Holes Angularity Concentricity Contours, Radii, and Cams Cured Holes Flatness (Dish) Hole Tolerance Internal Radii Out of Roundness Parallelism Perpendicularity Positioning Roundness Standard Linear Tolerances Straightness Surface Texture Tapered Holes Variables Contact Us Get a Quote Additional Contacts
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 Flatness (Dish) Flatness and straightness are so closely related that confusion may arise unless the foundry and purchaser clarify the definitions before production. Mil Std. 8 specifies "a flatness tolerance is the total deviation permitted from a plane and consists of the distance between two parallel planes between which the entire surface so tolerated must lie." In measuring, the parallel planes must be the minimum distance apart. Degree of Flatness Degree of flatness in an investment casting is almost always determined by the volumetric shrinkage of wax and metal during cooling. Usually in the center of the mass, this shrinkage is called "dish" (shrinkage, dip, or "out of flat"). Dish can be controlled by specialized techniques, but it will always occur to some extent. General flatness tolerances cannot be quoted because they vary with configuration and alloy used. The following is a rough guide for areas under 6 square inches. Allowable dishing is in addition to basic tolerance. Thus on a block 1" .005" thick, the following would apply: The method of measuring flatness should be specified by the purchaser. It may vary from a simple surface plate and feeler gage for normal tolerances to full layout with equalization and dial indicators for premium tolerances. Questions about investment casting flatness? 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