Mass Timber Robot: From Pegged Frames to ABB Cells

A mass timber robot handles parts much heavier than the studs in a framed wall: cross-laminated timber (CLT) panels, nail-laminated decks and glulam beams that carry whole floors. This post follows how those parts went from hand-cut beams to CNC joinery machines, then to the first robot cells that saw, drill, nail and stack timber into panels and modules. It covers recent projects such as SWIFT-BUILD and All3, and where ABB robots like the IRB 4600, IRB 6700 and IRB 7600 already fit or could fit in a timber plant.

The Katajanokan Laituri building under construction in Helsinki, June 2023. Photo: Aarni Salomaa / Wikimedia Commons (CC BY 4.0)

How timber went from the carpenter's yard to CNC joinery

For centuries a timber frame was laid out and cut by hand in the yard. Carpenters scribed each joint, chiselled mortises and tenons, cut numbered marks into the members so they could be matched again, and drove oak pegs to lock the frame on site. Only a few people could read a drawing and a crooked beam at the same time, so a builder's speed depended on how many of them they could hire.

Wooden pegs lock the joints of a hand-built barn frame at the Peter Dalton Ranch in Reno, Nevada. Photo: Historic American Buildings Survey / Library of Congress via Wikimedia Commons (public domain)

Machines started to take over the cutting in the 1980s. In 1981 a customer asked the German entrepreneur Hans Hundegger, who had set up his own business in 1978, for a computer-controlled joinery machine. His prototype, the P8, was shown in 1984 and went into series production in 1986. A smaller model, the K1, followed in 1996. A beam could now be fed in, sawn, drilled and slotted to a program instead of to pencil marks.

A worker cuts a joint in a timber with a mortising machine at Vermont Timber Works. Photo: Vermont Timber Works / Wikimedia Commons (CC BY-SA 3.0)

Cross-laminated timber came out of Austria in the 1990s. Gerhard Schickhofer presented his doctoral research on it in 1994, worked with small sawmills to press the first panels, and saw the product approved in December 1998. Austria issued the first national CLT guidelines in 2002, and the European product standard EN 16351 followed in 2015. The Stadthaus in Hackney, London, finished in 2009, was framed entirely in CLT over nine storeys. Panels are glued crosswise, pressed, sanded and then sent to a multi-axis CNC machine that cuts openings and connections, which made CLT a natural material for robots to handle next.

A piece of cross-laminated timber made from three layers of pine. Photo: Alexander Ryne / Wikimedia Commons (CC BY-SA 4.0)

Where robots work in mass timber plants today

Universities built the first robot cells for timber assembly. For the DFAB HOUSE at ETH Zurich, robots on a ceiling-mounted gantry sawed and drilled 487 beams and placed them into six spatial timber modules between 2016 and 2018, working with the timber builder Erne AG Holzbau. ABB robots did the work, though people still bolted the beams together by hand. At an Autodesk Technology Center, Perkins and Will used an ABB IRB 4600 on an IRBT 4004 linear track, with suction grippers, drills, saws and nail guns, to fabricate nail-laminated timber. The track stretched the robot's 2.55 m reach across about 9 m, enough to work along a full panel.

ABB robots assembling a timber frame module for the DFAB HOUSE at ETH Zurich. Photo: Gramazio Kohler Research, ETH Zurich / ABB

Two announcements this autumn move the idea toward building sites. In late August 2026 Foster + Partners announced SWIFT-BUILD, a three-year project with a €4 million grant from the European Innovation Council's Pathfinder programme. Robots would assemble a timber building from the top down: each floor is built at ground level, lifted, and the next one built beneath it. Partners include TU Delft, TU Munich and the University of Bristol, and drones are meant to watch progress from above. On 3 September 2026 All3, which uses CLT as its main material and pairs a cell-based Robofactory with an on-site assembly robot called Mantis, announced an investment from WaVe-X, the venture arm of Austria's WALTER GROUP.

Sweden's tallest wooden house under construction in 2013, wrapped in scaffolding. Photo: Topplanternin / Wikimedia Commons (CC BY-SA 3.0)

ABB already has robots sized for these jobs. The IRB 4600 handles nailing, drilling and routing heads, and on a track it covers a long panel table; tracks of this kind are set up as external axes in RobotStudio. The IRB 6700, with payloads up to 300 kg, and the IRB 7600, up to 500 kg, can lift beams, stack layers or turn finished elements. ABB robots also cut and assemble timber panels in AUAR's micro-factories, covered in our post on home building microfactories. I found no plant that uses IRB 7600s to lay up full CLT billets, so that use is still a possibility.

An ABB robot handling a timber panel at AUAR's robotic building cell. Photo: ABB

What comes next for robotic timber construction

Over the next few years the heavy cutting will probably stay with dedicated CNC machines, while robots take the steps around them: laying boards into a press, fixing insulation and battens, nailing, fitting windows into wall elements and stacking finished panels. Programs for these cells are generated from the building model and checked in RobotStudio before a panel reaches the table. Wood is the hard part. Boards warp, knots throw off a nail, and moisture changes the size of a panel, so cells need vision and force sensing to adjust as they go.

LVL, CLT and steel structure in the lobby of the Katajanokan Laituri building in Helsinki. Photo: Aarni Salomaa / Wikimedia Commons (CC BY 4.0)

People buying homes would mostly notice faster delivery of timber apartments and houses. SWIFT-BUILD plans to finish with an autonomous robot team building a multi-storey timber pavilion, which will show whether the top-down method works outside a test hall. The grant runs for three years, so that test is still some way off. Its connections are designed to come apart again, so a building could be taken down and its timber reused. That only pays off if the robots can disassemble as reliably as they assemble.

An ABB IRB 6700 lifts a large flat module at dhp technology, the kind of load a timber panel cell handles. Photo: ABB

Cost and skills are the slower problems. A mass timber plant needs a steady order book to pay for a press, a joinery line and a robot cell, and many projects are still one-off designs. Building codes are still catching up: the US International Building Code added the mass timber construction types IV-A, IV-B and IV-C only in its 2021 edition. Carpenters will still be needed, but more of them will be programming and maintaining cells instead of cutting joints.

ETH Zurich's In situ Fabricator, an ABB IRB 4600 on a tracked base, building a curved wall. Photo: Gramazio Kohler Research, ETH Zurich / Wikimedia Commons (CC BY-SA 4.0)

Innovation

AI solutions for effortless ABB robot control.

Automation

Robotics

ceojohntran@chatwithrobot.net

+84905311611

© 2025. All rights reserved.

qtran1215@gmail.com