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How to find the bottom dead center of a kiln tyre?


How to find the bottom dead center of a kiln tyre?

Kiln Doctor answer: Is the kiln running or shut down? If shut down simply find the center of the tire axially with a tape measure and scribe a line for about 12' circumference. Then use a level up against the bottom of the tire. When level, mark the tangent point on the scribed line. This is BDC. Use a precision level for better accuracy. For still more accuracy use an optical autolevel. Fix the zero end of a machinist's scale or optical tooling scale to a magnet and place the magnet end on the tire. The scale needs to be pointing out radially from the tire. With someone looking at the scale through the autolevel run the magnet/scale along the scribed circumferential line through bottom dead center. The observer through the autolevel will identify BDC when the scale reading reaches a maximum. If the kiln is running: Place the autolevel near the centerline of the kiln and look downhill to the bottom edge of the tire. The autolevel will have to be fitted on a vertical rack to allow vertical adjustment. Run the autolevel up/down so that the horizontal line of the cross hair is tangent to the edge of the tire. By carefully sighting the crosshairs at the bottom tangent point the center of the tire can be optically identified. Swing the scope and center punch a column. That will give you at least the elevation of BDC, downhill edge. Spray the bottom of the stationary tire with light oil. The oild will slowly drip off at the center of the tire.



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