Test indicator method for measuring camber:Ī test indicator sitting on a calibrated granite table is placed on the part and zeroed out to the piece. Substrates that pass through the gap under their own weight are acceptable (Coorstek). To inspect for camber, parallel plates are set at a 45° angle with a gap equal to the “ D” value determined in the formula. Parallel plates method for measuring camber: The measured values are plotted until a mode of thickness value is determined.Įxample: For a nominal 4.0” x 3.5” x. The thickness of each sample piece is measured to the nearest. Substrate mode of thickness, T, is established using an. L = Substrate length or longest outside dimension T = Substrate mode of thickness, where the mode is defined as the value most frequently measuredĬ = Camber value (reference part drawing) Substrates are inspected for camber using two ground, parallel plates spaced at a fixed distance by the following formula explained by Coorstek: This may not be visible to the naked eye. One example of poor camber is if you press down on one corner of a part with a flat face and the other corners lift up.Ī part that has flat faces but the thickness is not uniform, is another example of bow and warp. Ideally a part with perfect camber would be completely uniform in thickness and would lay flat against a surface without restraint.īad camber is typically the result of deviation, which is the bow and warp of a substrate. It is most often specified in inch per inch specifications. If the part can’t slide through, the camber is outside of specifications. This is normally measured using a set of parallel plates with a gap that the substrates will pass through. What is Camber?Ĭamber is the measurement of a substrate’s curvature on both faces showing the deviation, bow and warp along the longest linear dimension. We have answered a few key questions which should help you to better grasp the concepts.

Many people assume that the two terms are synonymous but this is a dangerous misconception. I used the drawing and symbols from the first answer to the problem.In an industry where every detail matters, understanding the basics of camber and flatness is vital. The two unknowns are the radius ($PC$ or $r$) and $XC$ which is part of the radius. The two knowns are the chord length $UV$ ($l$) and the chord height $XP$ ($h$).

Camber calculator string