| The robot learns about its environment by using an ever increasing spiral movement and by bumping into things, backing off a little, turning a little and moving forward again. This is entertaining to watch, for the first five or ten minutes, as it feels its way around the edge of the room. It uses a number of cleaning devices as it goes along: ~ at the front right corner is a rotating, three armed side brush that sweeps dust from the edges into the centre of the unit. It is this that makes the cleaner effective along walls and into corners ~ at the front left corner is a static flat brush that, again directs dust towards the centre of the unit. It can't be as effective as the rotating brush. I guess this is a compromise of cost against efficiency ~ at the mid point are the main drive wheels with a rotating rubber blade brush which agitates the surface to loosen the dirt ~ immediately behind this is the main brush. It is a rotating plastic bristle brush (17 cm wide) typical of upright vacuum cleaners ~ Following this is a vacuum opening with a trailing blade, presumably to enhance suction, which sucks dust into a plastic particle bin |
| The robot is visibly effective. The beating and sucking action removes all but the most engrained or heavy dirt. I found that room corners were sometimes left with a small amount of dust and dirt and, of course, all the higher level surfaces remain untouched. |
| not let him out till he's done. |