LumberJocks

Are dust extractor (shopvac) makers lying?

  • Advertise with us

« back to Power Tools, Hardware and Accessories forum

Forum topic by Sarit posted 03-13-2017 06:36 AM 437 views 0 times favorited 0 replies Add to Favorites Watch
View Sarit's profile

Sarit

549 posts in 2976 days


03-13-2017 06:36 AM

Topic tags/keywords: dust collection festool grin shopvac vacuum

I’ve researched a lot about vacuum motors and I don’t think it’s physically possible to get anywhere near the cfm and water lift numbers that the high end dust extractors claim to get. Bosch claims 150 cfm and something like 99” lift for their vac and the others: festool/fein aren’t far behind. And they do this using a measily 9 amps of power.

The reason I’m questioning them is if you look at central vac motor makers like Ametek-Lamb which publish fan curves for their motors, you have to go to their larger and higher amp draw models to get anywhere near those numbers and still you’d be using more amps. These fan curves show max cfm at 2” orifices whereas the extractors’ hoses probably cap out at 1.5” ID.

So are they lying? If not then why the discrepancy?


0 replies so far

Have your say...

You must be signed in to reply.

DISCLAIMER: Any posts on LJ are posted by individuals acting in their own right and do not necessarily reflect the views of LJ. LJ will not be held liable for the actions of any user.

Latest Projects | Latest Blog Entries | Latest Forum Topics

HomeRefurbers.com