Sweepr360

We are building a home cleaning robot.

An early-stage robotics startup designing Alpha, an autonomous cleaning robot, and its dock. Follow the feed - we post the broken stuff too.

NowThe slot that stayed open all week - braked stops with the pack deep in sag - closed on schedule as the last measurement of yesterday's block: same class as warm, and the limit minted Wednesday didn't move. The registry got its dated append this morning; no meeting required, the band's own note did the paperwork. Elsewhere on the sheet, a tyre spent seventeen passes quietly knitting itself a felt sock off the rug offcut, and the day-old 4 cm limit noticed before any of us did.the feed ->as of 31 July 2026

Latest

14 mm, no padding

29 July 2026

Friday's post promised that the band which stops Alpha on command would leave "class" and get a hard measured number at this morning's table, no padding. It did - hard 14 mm - and the table didn't stop there. Two more bands got real digits, Monday's solder bridge was adopted as the design, an overnight 200-capture run put a firmer worst case under the recovery rule, and the room's worked-example check caught an arithmetic slip in that rule's own text before it was voted - which is now the table's favourite argument for running the examples out loud.

Read the update ->

From the blog

Minted Wednesday, measured Thursday

Callum Bryce · 31 July 2026

On Monday a solder bridge went on the bench. On Wednesday the table adopted it and minted a new fail-safe band - with its one unmeasured case written into the band's own note, scheduled as the last item of the next soak block. On Thursday that block ran, the battery got low the way batteries actually get low, and the number came back. Plus the new 4 cm position band catching a tyre full of felt in its first six hours on duty.

Read ->

Cold numbers, warm machines

Callum Bryce · 24 July 2026

On Wednesday we wrote down what counts as failure before Alpha's first long run. On Thursday, pass six, a limit tripped - a warm gearbox coasting a few millimetres past a band we'd measured cold. Priya tells that part herself. Plus the reading we didn't get, and the morning it turned up.

Read ->

The first clean we filmed

Callum Bryce · 17 July 2026

The air story lived on a bench until this week, when Alpha drove a real floor with a camera on it - one continuous take, coverage complete, the counted window green the whole run. Here's what's on the film, the one stop that fired, and the mistake that killed the first take (mine).

Read ->

What the counted window actually measured

Callum Bryce · 10 July 2026

This week the loop held a clean ten-minute driving window on real air. Underneath that window is a set of numbers we hadn't counted before - a round-trip time, a worst-case gap, and a safety window we moved even though the old one would have held. Here's what they measure, and the small box they were measured inside.

Read ->

What a first clean actually is

Callum Bryce · 3 July 2026

A robot doing a lap of a room sounds like a solved problem. For a machine that keeps its brain on the dock, that lap is the whole design proving itself in one run. Here's what went right this week, and the one thing we haven't tested.

Read ->

The microwave tail

Callum Bryce · 26 June 2026

We spent the week measuring the one number that could end Cass's all-on-dock bet - the control link's worst case in a congested home. On 5 GHz it held a straight line. On 2.4 GHz a microwave knocked the robot off its own control link about every other time the magnetron cycled, and we can name the schedule. This is the verdict post, ugly tail and all.

Read ->