The edge detector consists of two concentric cylinders that are joined together by springs. When in use, place the edge detector in the collet chuck, slightly offset between the two halves to create a wobble when rotated. Then slowly push the part into the swing end of the edge detector. The edge detector will center up and then suddenly lose concentricity. At this point, the edge detector is slowly moved along the Z-axis forward and raised above the workpiece. Now, jog the axis being positioned, moving the distance equal to the radius of the edge detector. Make sure you are on the page labeled "WORK ZERO OFFSET" and the cursor is on the correct line in the G CODE (G54, etc.) column. To cross the correct axis, press the PART ZERO SET button and confirm the correct entry.
Tip: If you are setting the TLO from the workpiece, you only need to set the workpiece coordinate offset for the X and Y axes. The Z-axis workpiece coordinate offset can be compensated by the tool length offset.
Tip: When using an edge detector, a spindle speed of 1000-1500 rpm is suitable.
If you need to find the centerline of a hole or a circular part, Indicol is a useful tool. This is a fixture for a dial gauge. Equipped with a C-clip to connect the Indicol to the tool holder in the machine spindle. The Indicol also has two or three adjustable arms and a clamp at the end for holding the dial gauge. An adjustable arm can be used to position the indicator so that the diameter of rotation is the same as the aperture.
To find the centerline of the hole, position the indicator head over the hole and manually rotate the tool holder. It can be checked whether the diameter of the rotation of the indicator head is substantially the same as the aperture, and the eccentricity of the current position is determined. Adjust the X and Y axes as close as possible before moving the indicator down into the hole. Once approached, slowly lower the Z-axis so that the indicator head enters the hole and adjust the arm so that the indicator shows the reading. Rotate the indicator to touch the surface of one of the four quadrants (X+, X-, Y+, or Y-). Now set the indicator zero and rotate it 180 degrees. The moving distance of the indicator is twice the adjustment distance of the axis. If your indicator moves 0.016 in the negative direction, the axis has a jog distance of 0.008 in the forward direction.
The indicator is now rotated 90 degrees and then reset to zero. The indicator is rotated 180 degrees to find the distance and direction that other axes need to be adjusted. Remember, in order to find the centerline of the hole, the pointer moves twice the distance of the axis. For smaller apertures, this procedure is difficult but very accurate. In each axis, you can find the exact centerline of the hole with an error of no more than 0.0001 inches.
Tip: The coaxial indicator saves a lot of time when looking for holes and the centerline of a circular part. This indicator is mounted in the collet chuck and is used during spindle rotation. Manufacturers claim that these indicators can be used for speeds up to 800 rpm, but the 50 to 100 rpm range is ideal; if the spindle speed is too high, it is difficult to tell which axis needs adjustment. The fixed arm keeps the surface of the indicator stationary during the rotation of the spindle. Each time the spindle is rotated, the indicator dial will show its eccentricity. You only need to slowly advance the machine axis while observing the movement of the indicator. Even if the indicator's eccentricity is as high as 0.250 inches, the rotation can be initiated and the adjustment can be completed in a few seconds, thus saving time.
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Coil Decoiler& slitting & shearing machine
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