General rules

Before shifting or copying a block it is important to know how the systems will react. Besides providing the move input, it is also important which input is used for creation of the plate or profile plane.

• In case the plate or profile is created in plan view, its plane is related to the drawing plane. This means it will take over the values used by creation of the drawing plane.

• In case of a top view, it can be a Height value in mm (for example 2000) or a grid value (for example H2).

• In case of a frame view, the plane is always related to the frame grid or so called frame spacing.

A combination is also possible. In that case a curtain distance is related to the given grid value. For example, FR10+2000, or H2+400, or B4-200.

A profile can be created in horizontal or vertical direction. In this case a grid value can be used as well and will be used as the related position. A combination is possible also in this case. For example, H2+400 or B4-200. If the breadth or height is given in an absolute value like 2000 mm, the profile has no relation with the grid offset table.

Next to the actual position, the given grid values are saved in the database and are used if the item is recalculated.

The given values are always the leading values. This means that if the grid values are changed in the System Management application or by using another frame space distance, the position of the related items will be changed after recalculation. The items that are related to the fixed values (2000 mm) will stay in that position. The items that are related to a combination value like H2+400 will be moved to the new position H2+400 (assuming that H2 has changed in the System Management application to another position).

If the item is moved or copied, the system will act in the same way. This means if a profile is created at grid B7+200 and shifted 300 mm, the new value will be B7+500. If this profile is shifted again with a grid distance of B2, the new value will be B9+500. And if this profile is then shifted again with a distance of B1+100, the new value will be B10+600. This same rule applies in all directions.

After moving or copying (block) the item will be recalculated automatically. After changing the grid values with the System Management application the items have to be recalculated with one of the functions under Home > General > Recalculate. This is done to position them in the correct place in respect to the changed grid values.

When the function Tools > Shift Block is used the items will not be recalculated. It depends on the situation whether it is necessary or not.

Types of lengthening a ship

In some cases the ship has to be extended. In this case a new hull shape will be created.

• In most cases the forward ship frames will be moved with the extended value and the frame numbers will remain the same. See Lengthening a ship, Situation A.

• In other cases the frame numbers will be renumbered as well but the shape of these frame will remain the same. See Lengthening a ship, Situation B.

In both cases the function Tools > Shift Block can be helpful. This is because in the first case the fixed values have to be adjusted and the grid numbers will not be changed, while in the second case the fixed values have to be adjusted in combination with the frame/grid numbers.

In both cases the shape of the ship and the frame spacing are the same so it is not necessary to recalculate the block after shifting the block. In the first case all drawings have to be recalculated while in the second case the frame views have to be changed with the function Drawing properties. The length position of the old frame numbers have to be changed to the new position. Length positions of slanted views have to be changed as well.

If the shape of the new position is also changed, a recalculation is always necessary. See Lengthening a ship, Situation C.