GRID - Autonomous Rebar Tying Robot

A self-driving, operator-controlled machine that ties rebar autonomously on large commercial jobsites.

GRID rebar tying robot driving down ramps from a pickup truck on a construction site.
GRID rebar tying robot on a rebar mat at dusk, with an operator supervising from a tablet
Two construction workers kneeling on a rebar mat next to GRID.
GRID on a rebar mat at an active construction site, with workers in the background.
GRID loaded in a pickup truck bed as a worker in a hard hat walks toward it.
5000
ties
Per 8-hour shift
14+
hours
Runtime with swappable battery packs
90
lbs
Weight, optimized for OSHA requirements
3 x 2 x 2.5
ft
Length x width x height robot dimensions

Autonomous rebar tying, built for real jobsites

GRID is an autonomous machine that ties rebar directly on the mat, keeping pace with crews on large commercial jobsites. It automates one of construction's most repetitive, injury-prone tasks, delivering consistent, inspection-ready ties that keep projects on schedule and costs down.

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Operator holding a tablet next to GRID, Arn Autonomy's rebar tying robot, on a rebar mat
Precision Tying
Delivers consistent tie retention and placement.
Autonomous Navigation
Navigates uneven terrain with precision.
Rugged Design
Withstands debris, dust, and rough surface area.
Weather Proof
Operates in rain, snow, and extreme heat.
Data Logging & QA
Logs tie counts, runtime, and reports.

What would GRID save on your next concrete pour?

Enter your slab and crew details to see your estimated labor savings.

Your slab

Total area of the slab you are reinforcing, in thousands of square feet. Drag, or use the + and - buttons.
50,000sq ft
1,000500,000
Rebar spacingDistance between bars, center to center, in inches. Bars run both ways, and every crossing is a tie.
12in. apart
4 in.36 in.

Your crew today

Share of your tying done by hand with pliers or a hook. The rest is done with a rebar gun.
70%by hand, 30% with a rebar gun
All rebar gunAll by hand
Hourly wage for one worker, before insurance and other costs.
$
Monthly cost for one worker: workers' comp, insurance and any other per-worker costs. We spread it over their paid hours to get an hourly cost.
$

Buy or lease

How would you like to get GRID?Pick one to compare the cost of GRID with your labor savings.
How we estimate

Estimates are based on the slab size, rebar spacing, crew mix and labor costs you enter, using typical field tying rates for hand tying, rebar guns and GRID, with one person running GRID at the same labor cost per hour. Labor savings do not include equipment cost, financing, maintenance or transport. If you choose to lease, GRID's cost includes the lease charge for the time it runs. Actual results vary with site conditions. This estimate is not a quote or a guarantee.

Rapid Integration. Precision Execution.

1
Illustration of two workers lifting GRID out of a pickup truck bed.

Setup

The GRID unloads easily from any pickup truck bed, SUV or trailer. Once you power it up, it maps the rebar mat so it's ready to start tying.
2
Illustration of an operator and crew member with a tablet as GRID starts on a rebar mat.

Operation

The GRID moves around the rebar mat on its own and ties each intersection while an operator supervises.
3
Illustration of GRID detecting a rebar cage obstacle while an operator watches on a laptop.

Detect & Tie

GRID uses computer vision to navigate the mat, detect intersections, and make the ties, all while avoiding obstacles.
4
Illustration of GRID on a finished rebar mat with each tied intersection marked green.

Log

When tying is complete, GRID logs the job and the mat is ready for poured concrete.

Autonomy built to transform the jobsite

GRID is Arn's first machine, built to bring autonomy to the jobsite today. It's the start of a growing lineup, and more machines engineered to handle other tedious, manual jobs are already on the roadmap

Contact our team
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GRID on a rebar mat at an active construction site, with workers in the background.