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Question: The bottom rings on the slitter rig have a slight wobble, which causes a wavy edge on the side of the sheet. What can I do to fix this problem?

Answer: First, make sure the inside diameter of the bottom slitter ring is sized properly for the shaft so that there is a slide fit. Typically a clearance of 0.002” is sufficient; anymore could induce a wobble.

Next, check the face of the slitter ring edge for parallelism to the ground bottom slitter shaft. Using a dial indicator, the cutting face should vary no more than 0.003”; otherwise the slit edge will weave accordingly within the stacked pile. Variations greater than 0.010” can be easily remedied by regrinding to a better tolerance.

For deviations of less than 0.010” run out on slitter rings that are locked into position to the shaft by a set screw, drill and tap a second set screw location 120 degrees from the first. Through a combination of loosening and tightening the two set screws, you should be able to minimize the wobble and bring the slit edge into conformance.