5 ms·
> movements per minute and pulsations per minute According to an ex-Sonicare senior engineer I work with, this is not actually what's important at all. The key
by exmadscientist 3y ago
> movements per minute and pulsations per minute
According to an ex-Sonicare senior engineer I work with, this is not actually what's important at all. The key thing they looked at (and still do look at) is the amplitude/travel distance of the bristle tips, and how that changes under load. It should stay strong under light load, but collapse under heavy load (so that when you mash the thing way too hard into your gums, power transfer stops and your gums don't get brutalized). It's a surprisingly delicate balance.
We recently had cause to look at a few of these devices (sorry for the vagueness, you know how it goes) and most of the non-Sonicare ones are pretty awful. The rotary Oral-B ones aren't bad at what they are, but they aren't the same. There is one Sonicare clone that really impressed though, and it's not expensive.
- johnchristopher 3y ago> The key thing they looked at (and still do look at) is the amplitude/travel distance of the bristle tips, and how that changes under load. It should stay strong under light load, but collapse under heavy load (so that when you mash the thing way too hard into your gums, power transfer stops and your gums don't get brutalized). It's a surprisingly delicate balance. Isn't that what the pressure sensor is supposed to be for ?
- exmadscientist 3y agoI'm describing the what and why, not the how. The older? better? models don't use or need any pressure sensor, it's all designed in to the resonant motor mechanism. The "new" pressure sensor is 100% marketing.
- ThePowerOfFuet 3y ago> There is one Sonicare clone that really impressed though, and it's not expensive. Come on. Don't do that without naming it.