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Technical Info

TOLERANCES

K-zell Metals will work with you, your design, and engineering teams to help find the manufacturing process that is right for the dimensional and budgetary constraints of your project. In general, the cost of manufacturers increases as the allowable tolerance becomes smaller.Because a computer drafting package can dimension the parts to thousands of an inch, don't show the dimensions any finer than your application requires. Cutting a part to a +/- 1/8" tolerance is much less costly than cutting it to +/- 0.015"

ANODIZED PARTS

(Color match on anodized parts) - The color of the anodize changes as the composition of the aluminum changes. This is most problematic at welded joints where the weld filler material is usually a significantly different alloy that the base material. The result is that the weld is generally a darker gray after clear anodizing than the adjacent material. The problem is minimized by filler wire selection and joint design, but cannot be completely eliminated.  

CNC cutting tolerances

INSPECTION

Final inspection and acceptance of polished materials must be made at K-zell Metals' factory.

CUTTING TOLERANCES

Parts processed with CNC cutting systems may have dimensional variations as a result of the mechanical components on the particular system, the cutting process and the material being cut.  The robotics of the particular cutting system has both repeatability and location tolerances.  The cutting process may not cut truly perpendicular to the surface of the plate.  The speed and direction of the cut also influences the kerf width.  The material may move on the table as the part heats up from the cutting process causing dimensional deviations. Tolerances for laser cut parts vary by material type, part size and cutting parameters.  In general most parts can be held within +/- 0.015”.  Please, inquire about special tolerance or tolerances on parts with any dimension over 36”.

PRE-ANODIZED

(Crazing in pre-anodized sheets) - Parts made  from pre-anodized sheet, have minor cracks in the anodized coating that form when the sheet is formed. This cannot be eliminated.

SHEARING

(Material distortion from shearing) - The process of shearing introduces stresses in the material being cut and can also release stresses already in the material. The change in the stress level usually results in some distortion of the cut part. Shearing narrow strips of 2" or less in width, will generally result in the part having a twist. Heavy sheet and plate will tend to have a bow in the finished part. Predicting the amount of distortion is very difficult. It changes with material type, heat treatment and thickness. K-zell Metals will use what shop practices are available to minimize the distortion, but the distortion cannot be eliminated.

WELDING

To ensure product reliability and safety, welding may need to be qualified to certain industry standards and codes. K-zell Metals has the ability to qualify to most welding codes.