CNC Dust Collection

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Forum topic by Dabcan posted 03-12-2016 03:56 AM 1181 views 0 times favorited 3 replies Add to Favorites Watch
View Dabcan's profile


255 posts in 4008 days

03-12-2016 03:56 AM

Topic tags/keywords: cnc dust collection cyclone 4 2 hose

If I run a small dust collector (portable unit, 1hp) and step it down to a 2” hose into a cyclone, then onto the CNC, am I really going to lose a lot of suction? I have a large 2HP dust collector I could use, but I don’t have a cyclone with a 4” port, so my only option is to step down to a 2” hose, but if this isn’t going to collect much dust, maybe it’s not worth running this way?

Keen to hear what others are doing for CNC dust collection.

-- @craftcollectif ,,

3 replies so far

View JAAune's profile


2088 posts in 3653 days

#1 posted 03-12-2016 07:21 AM

If you’re reducing down to a 2” hose, you’re better off with a shop vac and not a dust collector. Dust collectors require high airflow to work properly and you can’t get that from a small hose. Vacuums are much better suited to sucking air through small hoses since they are geared towards high suction, low flow applications.

-- See my work at

View JeffP's profile


573 posts in 2728 days

#2 posted 03-12-2016 12:56 PM

Agree with JAAune. Any DC sucks at sucking when you have a small hose on it.

I would recommend a combination. Work out some way to have a shop vac sucking up the visible stuff as close to the spindle as possible, and have a 4” or larger DC hose “reasonably close” for mopping up a good percentage of the airborne dust.

As for the airborne dust that get sucked up by the shop vac, and perhaps doesn’t get filtered down to small enough particle size before being shot back out into the shop air…I have often wondered what would happen if I piped the exhaust of my shop vac into an input port for my DC?

Since both my DC and my shop vac vent to the outside, it really doesn’t matter for me…but those with inside exhaust might want to experiment with that idea.

-- Last week I finally got my $*i# together. Unfortunately, it was in my shop, so I will probably never find it again.

View Dabcan's profile


255 posts in 4008 days

#3 posted 03-12-2016 01:18 PM

Thanks, that’s kind of what I figured. After purchasing the CNC and software and computer I’m pretty tapped on funds, so I’m just looking for a way to save money. It’s right beside my dust collector, so for now I think I’ll just run a 4” flex hose onto a home made dust boot, and save some money for a cyclone in the future.

-- @craftcollectif ,,

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