Another hair-brained dust collection scheme - Router Forums
Reply
 
LinkBack Thread Tools Display Modes
post #1 of 28 (permalink) Old 12-07-2012, 09:45 AM Thread Starter
Registered User
 
Join Date: Feb 2012
Country: United States
First Name: Chris
Posts: 1,298
 
Default Another hair-brained dust collection scheme

I's not like I'm specifically trying to cobble together a dust collection system because I'm a penny pincher (which I AM by the way).

The reality is that in my garage, I already have 3 shop vacs, two of which are 2 1/2", and one is 1 1/4" and a leaf blower that essentially has a 4" inlet. I got 2 of them at yard sales for a total of $10, and the leaf blower is for the yard. I use the shop vacs from time to time for sucking up water and cleaning cars out and stuff.

Now I have a relatively new interest in woodworking, and am trying to be creative about setting up a dust collection system that uses the vacuum sources I already own.

So here is my latest hair-brained scheme:

Suppose I hooked up 2 (or more) of the vacuums to a larger PVC pipe (4 or 6 inches), each with its native sized connector. In this setup, the pipe would be large to the stations and dropping down as necessary at the tool. I'm thinking that multiple vacs on a larger pipe would increase the CFM significantly, resulting in much better duct collection at the stations.

Hair brained, or does it have merit? I guess one positive is that if I eventually have the desire and funds for a dedicated DC system, the backbone would already be in place.

Again, I ALREADY have these vacs, and I am just trying to come up with a creative way to make the best use of them.

Please don't tell me to go out and buy a "proper" dust collection system, because that is not going to happen.
Chris Curl is offline  
Sponsored Links
Advertisement
 
post #2 of 28 (permalink) Old 12-07-2012, 10:05 AM
Registered User
 
GulfcoastGuy's Avatar
 
Join Date: Feb 2012
Country: United States
First Name: Patrick
Posts: 882
 
Default

Sure. Use a piece of larger dia. pipe a a plenum. The two (or three) shop vacs will draw the pressure down in the plenum and you'll get the combined airflow (with some losses) to a single working port you could use as the source for your shop wide system. We used a similar concept in the Water Valley Holley Automotive plant (Now Bendix) to supply the vacuum flow for the mass flow testers throughout the plant.

GCG
GulfcoastGuy is offline  
post #3 of 28 (permalink) Old 12-07-2012, 10:28 AM
Registered User
 
Join Date: Jun 2011
Country: United States
First Name: Duane
Posts: 1,709
 
Default

Only issue I see with that idea is noise. You will definitely need hearing protection.

I have found that hand tools are the best choice when I want to make mistakes at a slower rate of speed.

I don't suffer from insanity. I enjoy every minute of it.
Dmeadows is offline  
Sponsored Links
Advertisement
 
post #4 of 28 (permalink) Old 12-07-2012, 10:47 AM Thread Starter
Registered User
 
Join Date: Feb 2012
Country: United States
First Name: Chris
Posts: 1,298
 
Default

cool. i suppose i could make an enclosure that houses them with some insulation for sound deadening to help with the noise level.
Chris Curl is offline  
post #5 of 28 (permalink) Old 12-07-2012, 11:14 AM
Registered User
 
Join Date: Jun 2011
Country: United States
First Name: Duane
Posts: 1,709
 
Default

Quote:
Originally Posted by Chris Curl View Post
cool. i suppose i could make an enclosure that houses them with some insulation for sound deadening to help with the noise level.
That should do it!

I have found that hand tools are the best choice when I want to make mistakes at a slower rate of speed.

I don't suffer from insanity. I enjoy every minute of it.
Dmeadows is offline  
post #6 of 28 (permalink) Old 12-07-2012, 11:30 AM
Registered User
 
DaninVan's Avatar
 
Join Date: Dec 2011
Country: Canada
First Name: Dan
Posts: 14,910
 
Default

Remember to allow for heat exchange/cooling for the vac motors, Chris; with two of them in a confined space there'll be substantial heat buildup. If you can salvage the heat, not a bad way to heat your shop!
DaninVan is online now  
post #7 of 28 (permalink) Old 12-07-2012, 11:54 AM
Registered User
 
GulfcoastGuy's Avatar
 
Join Date: Feb 2012
Country: United States
First Name: Patrick
Posts: 882
 
Default

Quote:
Originally Posted by DaninVan View Post
Remember to allow for heat exchange/cooling for the vac motors, Chris; with two of them in a confined space there'll be substantial heat buildup. If you can salvage the heat, not a bad way to heat your shop!
Just put a vent low in one corner and an exhaust fan (computer box type) high in the opposite corner both insulated for sound and you'd be good to go.

GCG
GulfcoastGuy is offline  
post #8 of 28 (permalink) Old 12-07-2012, 11:58 AM
Registered User
 
Join Date: Jul 2012
Country: United States
First Name: Joe
Posts: 31
 
Default

Quote:
Originally Posted by Chris Curl View Post
Please don't tell me to go out and buy a "proper" dust collection system, because that is not going to happen.
Shop vacs are designed to move small volumes of air at high velocity at a high static pressure. Like those dopey vacuum cleaner infomercials where the guy picks up a bowling ball as the crowd Ohhhs and Ahhhs...Their impellers are far too small to be used in a "system". They work well connected to small tools, like a Fein or Festool vac connected to a sander or router. That's just the way it is. Connecting a 2-1/2" shop vac, or 2 or 3, to a 4"-6" pvc main, while producing a very large amount of noise, will result in far too low of a volume of air at the needed velocity to keep dust and wood chips suspended. That's just the physics of it. I wish the numbers worked for you, Chris, really, but I see you putting a lot of time and effort into this and not being happy with the result.
Good luck.

Last edited by J. Leigh; 12-07-2012 at 12:57 PM.
J. Leigh is offline  
post #9 of 28 (permalink) Old 12-07-2012, 12:25 PM
Registered User
 
GulfcoastGuy's Avatar
 
Join Date: Feb 2012
Country: United States
First Name: Patrick
Posts: 882
 
Default

Avg CFM for a shop vac is around 150. Three would max out at 450 (volume is volume), less in real world conditions. Rockler's hang on the wall system is spec'd at 650 CFM (less real world) rated for 4" duct work. Chris, your idea would be a definite boost IMO and worthy of exploration. Some inexpensive PVC pipe and fittings from HD or Lowes would be all that would be need to prove it.

GCG
GulfcoastGuy is offline  
post #10 of 28 (permalink) Old 12-07-2012, 12:26 PM Thread Starter
Registered User
 
Join Date: Feb 2012
Country: United States
First Name: Chris
Posts: 1,298
 
Default

i could use a little extra heat out there in the winter months.

joe, i understand your points, and you could very well be right. but i think it can't hurt to give it a try. after all, i have more time than money these days. if i keep the receipts and just press fit the PVC pieces together, i can return the whole mess if it doesn't work out.
Chris Curl is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Router Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in











Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Similar Threads
Thread Thread Starter Forum Replies Last Post
Index of Dust Collection Solutions and Comments allthunbs Shop Safety 28 03-14-2014 01:40 AM
Dust Collection on Table Saw Router Table Extension Guitarman1 Table-mounted Routing 0 10-02-2011 02:32 PM
Oak Park Dust Collection kawisser Table-mounted Routing 3 08-18-2011 07:32 PM
Dust Collection Tricks Marco Tools and Woodworking 8 07-22-2011 09:44 AM
Dust Collection Question Tigerpaw Table-mounted Routing 17 04-16-2009 04:42 PM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome