Birdsmouth

A birdsmouth is a V-shaped notch across the full width of a rafter or purlin, so it sits flat on its support.

Depth 20 mm

Depth 45 mm

Depth 70 mm

Birdsmouth. Drawn by the editor's own geometry code; right: the carved part in 3D.

When to use it

Use a birdsmouth where a sloped rafter rests on a wall plate or purlin. The seat lies on the support and the heel stops the rafter sliding.

Fields

Veld	Eenheid	Bereik of opties	Standaard	Wat het verandert
Point (x)	mm	from 0	1500	The tip of the V, along the part.
Depth	mm	from 1	30	How deep the notch goes.
Seat angle	°	1 to 89	35	Angle of the seat, the face that rests on the support.
Heel angle	°	91 to 179	Square to seat
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 birdsmouth

1. Select the part in the Parts list.
2. Under Extra processings, click Add.
3. Type birdsmouth in the search field and pick Birdsmouth.
4. Set Face and Point (x), the tip of the V along the part.
5. Set Depth and Seat angle. Set Heel angle only if the heel is not square.
6. Check that the part shows a green check. If not, open the Issues tab.

Tip

BVN and BVX write a birdsmouth with a square heel only.

Machine export

Format	Status	Details
BTLx	Partly supported	BirdsMouth.
BVN (Hundegger)	Partly supported	Operation 0200, square heel only.
BVX2 (Hundegger)	Partly supported	BirdsMouth, square heel only.
BTL 10.6	Supported	020 birdsmouth. Standard uses the specified vertex; the CAMBIUM profile applies the confirmed mouth 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.

Gerelateerde pagina's

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• Receiving step notch: Cut the receiving notch for a strut: step, heel or double profile. Fields, limits and machine export for the step joint notch.
• Queen post roof truss: A 7.2 m queen post truss at 40 degrees. Rafters and struts step into the tie beam and posts with heel step joints.
• Dovetail socket: Cut a dovetail socket into a long face, with a flank angle and a square or round closed end. Fields, limits and machine export.
• End-grain recess: A flat seat let into the end of a part for a steel base plate, square in the section. With a bore in its floor it makes a post base.
• Free contour: Your own outline of lines, arcs and curves, milled out of a face to a depth or right through. Fields, shapes, sharp corners and export.