TEDWALDI technology

Spring-screw system TEDWALDI

The screw pulls the parts together with a force of up to 1200 kg.

The spring eliminates the occurrence of gaps between the parts with a force of up to 260 kg.

When constructing a wooden building, it is advisable to use a special spiral fastening system that not only connects the workpieces together, eliminating any gaps in between, but also prevents the formation of gaps between the workpieces in the future due to inevitable wood shrinkage and warping.

The spring-screw system "TEDWALDI" is not just a simple wood screw with a spring, but a functional fastening system that eliminates the gaps between the workpieces during the assembly process. It also compensates for the wood shrinkage over time and prevents the formation of cracks between the workpieces.

The working principle

1. Opening drilling

As the first step in attaching the intervention fasteners, the measurement of the drill holes from the receiving pockets is considered. On each workpiece, the attachment points of the spring-screw systems are measured, which are placed at the ends and at a distance of no more than 1.2 – 2 meters apart, depending on the size of the log in cut dimension. Each subsequent row is measured with a displacement of the attachment points by 100 – 150 mm to the left or right of the workpiece axis, relative to the attachment point below.

2. Drilling details

The drilling of the receiving pockets on the measured wooden workpieces is done using connected drills. The first part of the drill creates a passage opening for the unimpeded passage of the screw through the log, and the second part of the drill creates a socket opening for attaching the spring-screw system in the log. The drilling depth depends on the height of the workpiece because primarily a passage opening for the unimpeded passage of the screw through the upper workpiece needs to be created. The drill should be extended if its length is not sufficient.

3. Attaching the spring-screw system

After properly positioning the workpiece in place, the spring-screw systems must also be attached to their designated positions and screwed in until the fastenings are fully tightened. If there is a lack of proper compression afterwards, one should determine and eliminate the cause that prevents the tight joining of the workpieces, and then reattach the spring-screw systems to the receiving pockets for subsequent screwing.

4. Attachment details

The spring-screw system is screwed in using a drill mixer with a 14mm screw head attached to its chuck. Initially, the spring-screw system is screwed in until the spring is fully compressed and the gap between the workpieces is eliminated. Detailed information can be obtained from the “TEDWALDI” brochure, which provides instructions on equipment and fastening methods.

Es wurde Zertifikat von der Universität Stuttgart ausgestellt

Unser Produkt - Feder-Schraubsystem “TEDWALDI” wurde erfolgreich von der Materialprüfungsanstalt der Universität Stuttgart getestet und es wurde ein entsprechendes Zertifikat ausgestellt

Zertifikat über die Durchführung der freiwilligen Fremdüberwachung № 51210-21.001

Assembly components

Drill mixer

— Rotations per minute
— Reverse function
— Keyed chuck ≥ 16 mm

Double passage drill

— Total drill length: 240 mm
— Opening diameter for screw passage: 14 mm
— Opening diameter for installation of the spring-screw system: 35 mm
— Hexagonal shank: 14 mm

Socket wrench

— Inner hexagon: 14 mm
— Length: 90 mm
— Hexagonal shank: 14 mm