Roof Components - Rising Purlin

With the selection list at the top of the dialog box you can choose existing settings. Using the disk icon you can save the current setting under the same name or a new name. Via the management icon you can create new settings, also by adopting existing settings, or modify or delete existing settings. See 'Save settings' in the 'General Help' manual.

The "rising purlins" function allows placing purlins into a roof surface at any angle to the fall direction of the roof. The following settings are available:

Identification number: The identification number determines the purlin material. Using the button at the end of the field, you can branch to the database and select a material.

Designation, member type: By selecting the designation, a specific purlin type is chosen simultaneously. Depending on this purlin type, purlins can be positioned differently. Accordingly, some fields in the dialog box change their meaning and labels. For example, chamfered purlins are positioned not by a bearing timber but by the chamfer width and an air gap. For skewed purlins, the rotation angle can be entered.

Width: Purlin width.

Height: Height of the purlin.

Position: Level to which the top edge of the bearing timber refers. Typically this is level 0, in which the rafters also lie.

Purlin edge to be positioned: Any of the 4 edges of a purlin can be positioned. For chamfered and standard purlins only the front and rear edges are relevant. For skewed purlins all 4 edges can be positioned. The bearing timber, however, always refers to the front upper edge, regardless of which edge was selected here.

Bearing timber type horizontal / vertical or Chamfer width: This field changes its meaning depending on the selected purlin type. For chamfered purlins the chamfer width can be entered here. For all other purlin types the bearing timber type is set here.

Additionally there is the "Height" option. As soon as this value is selected, the next field "Bearing timber" is deactivated because it no longer applies. When entering the rising purlin, a height point can then be chosen for each purlin end, the value of which can still be adjusted manually.

Bearing timber referenced to level or Distance from top edge of level: This field changes its meaning depending on the selected purlin type. For chamfered purlins the distance to the upper edge of the chosen layer can be entered here. For all other purlin types the bearing timber corresponding to the bearing timber type is entered here.

Direction: With the "Direction" you influence the input method for the purlin. This option then affects the further course of the function. The following possibilities exist:

Parallel: In the further course of the function you select a line. The purlin is then installed in the roof surface parallel to this line.

Perpendicular: In the further course of the function you select a line. The purlin is then installed in the roof surface perpendicular to this line.

2 points: In the further course of the function you select 2 points. These points determine the direction of the purlin.

Rafter to purlin connection: There are six settings in this field:

None: No connection is made; both members penetrate each other.

always cut: When penetrating with this purlin, the rafters always receive a cut, even if the rear edge of the purlin penetrates into the rafters.

always cut (consider plates in front of purlin): When penetrating with this purlin, the rafters also always receive a cut, even if the rear edge of the purlin penetrates into the rafters. Additionally, the program searches for plates in front of the purlin. If plates in front of the purlin are found, the cut is increased by the plate thickness. The plates must be perpendicular to the global XoY plane and must be parallel to the front purlin face. The plate must touch the front purlin face and the top edge of the plate can be flush with or at most 20 mm below the top edge of the purlin. The plate can have been created in DICAM or in the wall.

possibly mortise: When penetrating with this purlin, the rafters receive a cut as long as the rear edge of the purlin does not penetrate into the rafters. However, as soon as the rear edge of the purlin penetrates into the rafters, a mortise is created in the rafter. The threshold 'Minimum mortise depth' is taken into account. As long as the mortise depth is less than the value set here, the mortise is not created. A cut continues to appear.

possibly mortise (consider plates in front of purlin): When intersecting with this purlin, the rafters receive a notch as long as the rear edge of the purlin does not penetrate into the rafter. However, as soon as the rear edge of the purlin penetrates into the rafter, a cutout is produced in the rafter. The threshold "Minimum cutout depth" is also taken into account. As long as the cutout depth is less than the limit set here, the cutout is still not produced. A notch continues to appear. In addition, the program searches for boards in front of and behind the purlin. If boards are found in front of or behind the purlin, the notch is increased by the board thickness. The boards must stand perpendicular to the global XoY plane and must be parallel to the front purlin face. The board must touch the front or rear purlin face and the top edge of the board may end flush with or up to 20 mm below the top edge of the purlin. The board can have been created in DICAM or in the wall.

Cut in purlin: With this option no cut or mortise is created in the rafter. Instead, the purlin receives a mortise (free cut).

Rafter nail hole: A rafter nail hole can be created in two ways. It can simply be information attached to the cut or an independent hole can be created. Both options have different characteristics:

From cut: The information for the rafter nail hole is attached as information to the notch and is passed to the machine in that way, and the machine then treats the rafter nail hole as such. This type of rafter nail hole is not displayed in the structure. The diameter of this rafter nail hole is under 1-7-8 Limits, machining set. This rafter nail hole is created on cuts and free cuts.

Rafter nail hole: Below this group you can choose a separate, detailed setting. If one of these options is selected, the rafter nail hole is no longer generated as information on the notch, but a separate hole is created that is represented as such. Furthermore, the rafter nail can also be generated. This rafter nail hole is created on notches, free notches (also on ridge and valley rafters), on corner notches and on leaves (for very shallow rafters).

Shortening at the verge: As soon as a purlin ends at the verge during input, it is shortened by the value entered here. Negative values result in an extension of the purlins.

at the verge etc. bottom: The machining set here is produced at the lower end of the rising purlin. Which parameters are used to perform the selected machining can be viewed and changed via the Edit icon at the right end of the field.

at the verge etc. top: The machining set here is produced at the upper end of the rising purlin. Which parameters are used to perform the selected machining can be viewed and changed via the Edit icon at the right end of the field.

Depending on the setting in the "Direction" field, you now select either a line or 2 points for the purlin direction. The chosen line only determines the direction; however, the purlin can be located further away from this line. Therefore, next select a point that determines the position of the purlin. If you chose the direction via 2 points, the purlin is also placed through these 2 points. Finally, you can enter an offset. The purlin is then additionally shifted by this amount.