"Silencing" my Shop-Vac Used for CNC Routing

Shared stories of success and failures from the novice to the professional.

"Silencing" my Shop-Vac Used for CNC Routing

Postby jscook55 » Sun Mar 18, 2012 3:11 pm

So I've had some success with quieting down my Shop-Vac used with my ZTW CNC router., the tradeoff being a slight loss of suction. Since only the hose moves around using my setup (http://www.jcopro.net/2012/03/12/a-cnc-mount-for-a-shop-vac-nozzle/), it's pretty easy to put a muffler on it, and use some noise "panelling", AKA packing material. Here's a link to an overview of the project with some stats on how quiet I made it:

http://www.jcopro.net/2012/03/15/shop-vac-noise-reduction-muffler-and-panelling/

Image

And here's one about how to make the muffler itself, that does most of the sound-absorbing work:

http://www.jcopro.net/2012/03/18/how-to-make-a-shop-vac-muffler/

Image

Have fun, this may make those that live on the inside of your house a little happier. Your ears will thank you as well.
My site about DIY camera mounts: http://www.diytripods.com/ Twitter: https://twitter.com/JeremySCook
User avatar
jscook55
Forum Resident
 
Posts: 240
Joined: Fri Jun 10, 2011 5:44 pm
Zen Model: Zen 0712 (Ext. Mod)

Re: "Silencing" my Shop-Vac Used for CNC Routing

Postby roller » Sun Mar 18, 2012 7:57 pm

Just a thought - if you're losing suction your motor is probably working harder therefore getting hotter and shorter life. Perhaps a dual exhaust to lower the back pressure?
User avatar
roller
Forum Moderator
 
Posts: 474
Joined: Wed Jan 26, 2011 8:54 pm
Location: Brisbane, Australia
Zen Model: Zen 0712 (Ext. Mod)

Re: "Silencing" my Shop-Vac Used for CNC Routing

Postby Sparky » Mon Mar 19, 2012 11:48 am

I like this type of approach to CNC noise and dust abatement. It's an issue that's been in the back of my mind, nagging at me for some time. Right now I'm using two methods which, for me at least, are very effective: confinement and isolation.

For confinement I built an enclosure to fit over the CNC router. It's essentially a removable, bottomless box with clear acrylic sliding doors. I intended to route a vacuum hose inside, but discovered that instead of dust coating the entire interior and the machine as expected, it was mostly confined to the workpiece surface and compacted inside the trough left by the bit. So once a job is finished, I just spot vacuum by hand. It only takes a few seconds. The enclosure walls are sandwiched pieces of Masonite glued to a frame made of 1/2 inch pine strips. This results in an airspace which helps deaden the sound. An obvious additional benefit the enclosure provides is protection from projectiles such as broken bits.

For isolation I relocated the big dust collector outside the shop and ran a length of hose through the wall. It's located in an attached shed where lawn and garden tools are stored. It's not a solution for everyone, but whatever degree of confinement and isolation can be reached sure makes CNCing a lot more enjoyable.
User avatar
Sparky
Forum Moderator
 
Posts: 402
Joined: Sat Nov 06, 2010 7:12 pm
Location: Texas
Zen Model: Zen 0712 (Ext. Mod)

Re: "Silencing" my Shop-Vac Used for CNC Routing

Postby johntech » Mon Mar 19, 2012 6:56 pm

I just ran across a video on youtube about cyclone dust collectors at http://www.youtube.com/watch?v=lPM5rm-i ... re=related and am in the process of making one. I have watched all of this guys videos and it looks like it works very well plus it is cheap to make! The problem I have with my shop vac is the filter gets plugged up real fast then it loses suction. Yes it is still VERY noisy. The way it works is the cyclone attachment goes between the input hose and the vacuum itself. From the videos most all of the dust ends up in a 5 gallon bucket that sits under the cyclone attachment keeping the filter relatively clean. I have a ton of sawdust mess from my table saw and power miter box every time I use them. So I'm hoping to end this mess using the cyclone attachment. From the video you need 4 pieces of 2X4, 4 pieces of 3/4" plywood 16"X16", about 3-4 ' of roof valley flashing 5" wide and a piece of 2" pvc piping about a foot long to make the base unit. Check out the videos for all the info and demos.

John
User avatar
johntech
Forum Moderator
 
Posts: 422
Joined: Tue Mar 22, 2011 7:09 pm
Zen Model: Zen 1212

Re: "Silencing" my Shop-Vac Used for CNC Routing

Postby Sparky » Tue Mar 20, 2012 10:51 am

Looks like that should help. Rockler has a plastic version of a lid that sits atop a 20 gal galvanized trashcan. I have one inline with the suction hose on a Jet 4" dust collection system, but hose reducers are available. It works great and is easy to empty. The Jet is a vortex design too, but the majority of debris falls into the first stage trashcan.
User avatar
Sparky
Forum Moderator
 
Posts: 402
Joined: Sat Nov 06, 2010 7:12 pm
Location: Texas
Zen Model: Zen 0712 (Ext. Mod)

Re: "Silencing" my Shop-Vac Used for CNC Routing

Postby jscook55 » Sun Apr 29, 2012 9:45 pm

Ok, here's a new design I came up with. It uses Styrofoam and seems to restrict the air flow less. Also, it's lighter, cheaper, and uses fewer parts. The tradeoff is that it's a bit louder. I made it with one of the Zen foam cutters, so I guess I've come full circle using one Zen tool to make parts for another...
http://www.jcopro.net/2012/04/29/another-shop-vac-muffler-less-difficult-more-foam/

Image

I've left it on for now, so I'm fairly happy with it. Note the MDF tree that I made for it in the background.
http://www.jcopro.net/2011/11/10/a-random-tree-made-with-inkscape/
My site about DIY camera mounts: http://www.diytripods.com/ Twitter: https://twitter.com/JeremySCook
User avatar
jscook55
Forum Resident
 
Posts: 240
Joined: Fri Jun 10, 2011 5:44 pm
Zen Model: Zen 0712 (Ext. Mod)

Re: "Silencing" my Shop-Vac Used for CNC Routing

Postby jscook55 » Sat Dec 08, 2012 1:20 am

Apparently this project keeps getting rethought. Here's a version using no PVC, only foam: http://www.jcopro.net/2012/05/15/simplest-shop-vac-muffler-yet/.

Image

It should be noted that I also made this with the ZTW foam cutter using this setup: http://www.jcopro.net/2012/04/17/build-a-zen-toolworks-foam-cutter-kit-frame-for-under-5/
My site about DIY camera mounts: http://www.diytripods.com/ Twitter: https://twitter.com/JeremySCook
User avatar
jscook55
Forum Resident
 
Posts: 240
Joined: Fri Jun 10, 2011 5:44 pm
Zen Model: Zen 0712 (Ext. Mod)


Return to Stories of Success & Failure

x