Dyson Piston

[Hatsuwr]

@Hatsuwr, the absolute TL;DR is that suction determines air speed, airflow is secondary to suction (pressure difference by the way), airwatts is like electronic circuitry (suction ≈ voltage, airflow ≈ amp current, flooring and leaks ≈ resistance), and you need both good seal and proper agitation and effective pile separation. The best cyclonic designs are far better than bags because they doesn't lose suction unless overfilled bin or reckless usage, and finally...


Dyson motors are far too small for normal ball bearings of any reasonable size, by the way.

I doubt they are too small for commonly available bearings. McMaster has 1/8" and 3 mm OD for sale, and it's not hard to get smaller from a manufacturer.
Although that does bring up a correction I should make: at this size, speed ratings of 100k-200k rpm aren't as uncommon as I first assumed.
https://www.mcmaster.com/57155K339/

Regarding your other point... Actually I'm not sure what that point is. Is it just another opinion about cyclonic separation vs bags? Not really sure why we are addressing that one again... They each have their pros and cons. Pressure loss is just one of the differences, but personally I think there are more important distinctions. Besides, pressure loss is going to depend more on the specific implementation of the system rather than just the decision about which method to use.

 

[cheesewonton]

I doubt they are too small for commonly available bearings. McMaster has 1/8" and 3 mm OD for sale, and it's not hard to get smaller from a manufacturer.
Although that does bring up a correction I should make: at this size, speed ratings of 100k-200k rpm aren't as uncommon as I first assumed.
https://www.mcmaster.com/57155K339/

Regarding your other point... Actually I'm not sure what that point is. Is it just another opinion about cyclonic separation vs bags? Not really sure why we are addressing that one again... They each have their pros and cons. Pressure loss is just one of the differences, but personally I think there are more important distinctions. Besides, pressure loss is going to depend more on the specific implementation of the system rather than just the decision about which method to use.

I have been experimenting with a home made expander cage for an old Kenmore from 1982. In standard form they very much suffer airflow reduction as the bag fills. It is their only fault but one that many bagged vacuums suffer. I made an expander cage that keeps the bag away from the sides, bottom and in particular the underside of the lid. Remember those old Kennys had the motor sitting vertically with the fan facing up under a big square filter housing. Keeping the bag away from the lid and away from the sides of the air filter box seemed to be the key to maintaining airflow as the bag filled. Turns out my home made expander cage worked as planned maintaining full airflow ( easy to judge based on the hiss coming from the hard floor brush which formerly declined to almost inaudible as the bag filled, but not now ) until the bag started to back up into the hose. I got the idea from the expander cages used in the Kenmore Elite and Intuition canister vacuums and the removable expander cages in some modern Panasonic vacuums sold in North America and Japan.

 

[Absolute Rainbow]

I have never seen that kind of power consumption with the v16 - no matter which attachement or cleaning scenario and this 2x power consumption difference from the nominal rating given on the label would be pretty much out of line compared to the older machines.

The data was collected from all machines i have - tested with no attachement (what should give maximum motor power data)

V11 Outsize 91 wh battery size / runtime 8:06 --> 674,1 consumption / 545 nominal = factor 1,237

V12 63 wh / 5:35 -> 667 / 544 = factor 1,226

Mirco 1,5kg 36 wh 6:37 --> 326,45 / 225 = factor 1,451

Gen5 90wh / 5:35 -> 967,2 watt / 752 = factor 1,286


V16 99,97 wh / 11:30 --> 495 / 450 = factor 1,1


All machines had factory new batterys except for the micro (that i bought 2nd hand and i do not know how good the battery is so the data is maybe compromised by this) have around factor 1,25.

So the v16 would have the out of the line factor 2x or even more and i still have no data found that the 900w is actually no marketing term and actualy means 900 Watt which should give about 6:30 minuntes of runtime (or less if > 900 watt).

Assuming V16 is just underpowered instead of merely being crippled.

@frickhelm hello. @Vacuum Facts found out that one can fix the V16.

 

[centralsweeper63]

By potentially damaging it after time!