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KB53: Shorten loop area

Category: Control Considerations | Updated: 6/12/2007 8:19:10 AM | Owner: The Professor | Read: 5710 (Last: 9/22/2019 12:49:17 PM)

Resolution

Contrary to what you may have heard, allowing all the distance possible is not the answer to providing a proper looping area. The purpose of providing a free loop is to accumulate slack, and all slack is accumulated in a vertical direction, not horizontal. Slack is only the difference between all the material hanging in the loop and the horizontal length of the loop. That horizontal length represents only taut material. Once a stock line height is fixed, any horizontal length which is greater than what is required to let the material fall naturally slack, simply subtracts from the amount of slack material. Nominally, we think of the horizontal length required as being 1440 times the heaviest thickness you will run in that line. Certain considerations can even shorten that distance to your advantage. If you are having trouble accumulating sufficient slack, think in terms of shortening your looping distance to its optimum. At least two full feed lengths of actual slack should be accumulated for each job.

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KB57  Spring-loaded dampeners
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KB59  Magnetic cascades
KB60  Auto-variable speed
KB61  Eliminating "stop marks"
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KB64  Excessive loop shutoff

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