(Note: Because of the dead wraps the amount of usable wire rope on the 1st layer is diminished slightly. This has been factored into each of the drum calculator outputs.
A given amount of freeboard is maintained to prevent the wire rope from inadvertently coming off the drum during use. The amount of freeboard is dependent upon the prevailing agency or regulatory body. In the United States, Ingersoll Rand follows ANSI / ASME B30.7 (BASE MOUNTED DRUM HOISTS) which recommends a minimum of ½" of freeboard be maintained. For your convenience the freeboard selection box allows you to choose various options or input your own requirements.
Note: The one exception to this is Full Drum Storage. When the winch is not being used to move a load, the wire rope may be spooled to the top of the flange. This practice is for storage purposes only and not recommended when the winch is being used under a load.