Straight lap

A straight lap (simple scarf) lengthens a beam: both ends are cut away over the same length so they overlap.

Straight lap. Drawn by the editor's own geometry code.

When to use it

Use it for purlins and plates that are mainly loaded in compression. It is quick to make. One or two dowels hold the ends in place.

Fields

Veld	Eenheid	Bereik of opties	Standaard	Wat het verandert
End		Start, End	End
Position X	mm	from 0	3000	The end face the joint sits on.
Length	mm	from 1	400	How far the joint runs into the beam.
Depth reference side	mm	from 0	50	Thickness left standing at the end face, measured from the reference side.
Depth opposite side	mm	from 0	50	How deep the joint starts at the root, measured from the opposite side.
Drill holes		0 to 2	0	Number of dowels through the joint (0, 1 or 2). They sit at one third and two thirds of the joint.
Hole 1 Ø	mm	from 1	20	Diameter of the first dowel hole. Shown only for some settings of the other fields.
Hole 2 Ø	mm	from 1	20	Diameter of the second dowel hole. BVN and BVX drill both holes with one diameter. Shown only for some settings of the other fields.
Face		Top, Bottom, Front, Back	Bottom	The side of the part the processing is on.
Splinter-free		Machine default, Off, Tool path	Machine default	Machining that keeps the edges from splintering. Machine default writes what each file normally has for that operation. BVX and BVN carry an explicit choice where the operation has the setting, and the export says so where it does not. BTLx has no such setting.

Default: what Add fills in on a 3000 mm part of 120 x 120 mm.

Add a straight lap

1. Select the part in the Parts list.
2. Under Extra processings, click Add.
3. Type straight lap in the search field and pick Straight lap.
4. Set Face, End and Position X.
5. Set Length, both depths and the number of Drill holes.
6. Check that the part shows a green check. If not, open the Issues tab.

Tip

Give the other part the same joint on its end, with the side mirrored.

Machine export

Format	Status	Details
BTLx	Supported	SimpleScarf.
BVN (Hundegger)	Partly supported	Operation 1200, one drill diameter.
BVX2 (Hundegger)	Partly supported	SimpleScarf, both depths, the number of holes and their diameter. Two different diameters need your confirmation.
BTL 10.6	Supported	070 simple scarf and dowel holes. The CAMBIUM profile applies the confirmed depth correction.

BTL status describes what the specification can represent. CAMBIUM imported our earlier BTL test files; confirmation applies to the tested forms and build. See BTL coverage for representation and receiver caveats.

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