Thread Number: 34570  /  Tag: Recent Vacuum Cleaners from past 20 years
Designing a relevant, accurate vacuum test
[Down to Last]

Vacuumland's exclusive eBay Watch:
scroll >>> for more items
Post# 373735   6/12/2017 at 20:39 by wyaple (Pickerington, OH)        

wyaple's profile picture
Iíve been thinking of the best way to create the most revealing test(s) and show the most accurate results when deciding who "wins." One area of testing that has really bugged me is the ridiculous number of complete passes some testers and many (most?) laboratories perform. Letís begin with simple Mathematics.

Suppose that:

Machine A has 120 CFM and we know that it can pick up 50% of the test dirt in one complete pass.

Machine B has 90 CFM and we know that it can pick up 33% of the test dirt in one complete pass.

Machine C has 60 CFM and we know that it can pick up 20% of the test dirt in one complete pass.

Test #1 is now run and includes 5 complete passes.

Result for machine A: After picking up all it can in the first two passes, the remaining three passes are essentially useless.

Result for machine B: After picking up all it can in the first three passes, the remaining two passes are essentially useless.

Result for machine B: After five passes, essentially all the dirt is picked up.

Conclusions: Mathematically speaking, a one pass test would show the most difference between the three machines while a five pass test would incorrectly show nearly no difference. Since most people only vacuum in one complete pass anyway, shouldnít we be concentrating more on one pass tests? And that test should be performed at medium speed, not turtle speed, right?


Bill





Post# 373744 , Reply# 1   6/12/2017 at 21:51 by Real1shep (Walla Walla, WA)        
Totally agree.....

but I think where you're gonna get some argument is in the media itself to throw on the floor. I think it should resemble the dirt we face every day. And maybe that shouldn't be walnut shells, red sand or sawdust etc.

I don't have an answer, but I think demo salesmen for yrs have taken advantage of certain media that may not be relevant to real-world everyday household dirt. Media that they knew their particular machine would shine with.

Kevin


Post# 373765 , Reply# 2   6/13/2017 at 07:33 by sebo4me (Cardiff)        

sebo4me's profile picture
That's a good point Bill.

I think a test should be as close as possible to how an average person would use a cleaner and use collected dust from a used bag.





Forum Index:       Other Forums:                      



Comes to the Rescue!

Woops, Time to Check the Bag!!!
Either you need to change your vacuum bag or you forgot to LOG-IN?

Discuss-O-MAT Log-In



New Members
Click Here To Sign Up.



                     


Vacuumland home
Discuss-o-Vac Forums
Vintage Brochures, Service and Owners Manuals
Today's Vacuum of the Day
Photos of our Collections
Vintage Vacuum Cleaner to sell?
Technical/service questions?
Looking for Parts?
Website related questions?
Digital Millennium Copyright Act Policy
Our Privacy Policy