Measuring Dust Collection Airflow | Woodworking

What makes an effective dust collection system? It's important to choose the right dust collector, but it's equally important to choose the right hose size, hose type, and fittings to get the most out of your system. In this video, you'll learn how airflow is effected by the hose size, hose length, fittings, and layout of your dust collection system. We measure airflow in different situations to demonstrate how each component effects the effectiveness of your workshop dust collection system.

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[fivelittlescholarsca]

Thank you for inspiring the next generation of learners, perfect for our homeschool as we plan and build a dust collection system.

[ChrisMosesBrownMind]

Wow you broke this down to 3rd grade level. At first I was like, "Oh man, here we go. He's gonna put on his white lab coat and talk about the Bernoulli principle with fluid dynamic equations." But this was succinct, accurate and blessedly math free! Thank you!

[hienzkitzvelvet]

I’m a nail tech (nail salon owner) making a dust collector instead of spending thousands on a 110cfm fan and this helped so much! Thank you!

[boonedockjourneyman]

You have been an inspiration to me.

I read your book three times. Actually took two classes at 2nd year HVAC engineering level. I have two Ph.D.s and a law degree (no joke). I made a ton of money on tech stocks so I allocated $3M to build a sawmill, dry kiln, millworks and all the associated shops. 5500 sqft. Yup, the go big before you die approach.

But, I still ended up spending >$40K (2000 dollars) on engineering to get the dust systems right.

This stuff doesn’t scale from the 2 car garage shop (which is what I had for 25 years).

With the advent of the mega-shop builds that YouTube seems to suggest, people need to invest in experts. Or just try and self-insure your fire risk •••

[kristofferbeder]

I feel that you did an excellent job of explaining the basic mechanics of air flowing through a pipe, but completely neglected to say how it applies to this situation!
Should one use a larger diameter system of ductwork, only reducing as needed size at the tool? Can diameter be increased/decreased without significant losses? Is there an ideal diameter of the inlet for chip capture based on CFM or horsepower of the system? (duct length and complexity not withstanding). Is there an ideal volume/pressure ratio for chip capture? For airborne dust capture? Is there different CMF/HP/Diameter/airspeed for dust extraction VS chip capturing? How do such systems differ?

[danielpittman]

Totally distracted by the map of Budapest. My wife and I were there four years ago - what a great city full of wonderful people, and incredible history!

And thanks for this video; I'm setting up my first real dust collection system. Medium sized shop, voltage limited to 120V, so efficiency will be crucial.

[davidcrandell]

Best video on dust extraction I've seen on the web. Thank you.

[mikel]

Thanks for the science lesson, well done. Best explanation I’ve seen so far… and there’s lots on you tube. This alone earned my sub.

[kevindoyle]

Nice job, as a retired mechanical engineer I was impressed with the way you showed the principles. Now if you can just solve the miter saw’s problem of miserably poor dust collection.

[ZopcsakFeri]

Köszi, "Sanyi bácsi", for the explanatory video, this was just the topic that I needed to start with a second hand shop vac I just got from a friend! I got stalled in the first 2 seconds by the map on your wall, but it made me instantly google the author! Keep up the good work!

[thebobloblawshow]

Excellent tutorial. Thanks for the information. I’m setting up a shop and this has been very helpful. 👍👍🇨🇦

[slonersoftgames]

This is a ruddy brilliant video. I feel I much better understand what I'm up against. Dust collection has been a bit of a thorn (or perhaps a splinter) in my side as I try and figure out all the fittings and hoses and layout. This adds another layer of complexity, but a whole lot of understanding. Thank you!

[davidzaleski]

The man's wearing flannel. He knows what's up, im definitely watching this entire video lol. Thanks for the info very helpful

[Hawthorn-nz]

Excellent vid. Many thanks, from New Zealand

[Nikkimaya]

Great video. Gonna help me get control of my dust. By the way, since this is a video on dust, those blinds could use a good dusting.

[johnborton]

5:01: Nope

Given the same *volume*, the air flowing through a narrow hose will naturally travel at a higher speed than through a wider hose. Volume however wasn't the constraint stated by the presenter, but rather *pressure*. All other things being equal, with the same pressure, the speed will be the same in both hoses.

But let's be clear -- the same dust collector, powered by the same motor at the same electrical input won't be exerting the same (negative) pressure on the wider hose and thus the air velocity will be lower. That's the point to remember.

The reason the air comes out of the straw at a higher velocity is that a human can't generate the same high pressure in the wider tube -- you're off the human 'pump curve'.

Fluid dynamics are lovely, but not always lending to simply explanations.

[ronjenkins]

Thanks! This was an outstanding presentation.

[anvilstudio]

Clear and concise - thank you. Great fundamental information.

[CCaraway]

Wow!! I wish I could tell you how many people in Facebook groups for hobby level CNC router's and general woodworking group that I have preached dust collection principles to. 100% of my knowledge came from your book.
I am designing my 2nd dust collection system right now and I have to say THANK YOU because your book taught me so much.

[pinchpennyfurniture]

Most helpful video in understanding dust collection. Thanks