Light 4" PVC drain pipe is perfect for a dust collection system in a home hobby work shop. Sized Galvanized spiral duct is required and the best choice for commercial shops for several reasons, the primary being metal it is self-grounding and spiral is relatively light and tough and does not collapse from vacuum easily. Static electricity generates a lot of voltage which can arc. Static is caused by, moving air by itself, moving air with lots of particulate in it rubbing along the walls of the pipe, the pipe connects several machines that by their very function ( spinning things – bits and blades, rubbing things - belts and bushings ) generate static . A dust collector for wood working really doesn’t work unless the air velocity is around 3500 ft / min. Metal work is around 4500 ft / min. that’s a lot of air and nice fine dry sawdust rubbing the pipe walls ( like rubbing your feet on carpet ) also fuel.
I guess if your workshop is in a detached garage you only stand to loose the garage but my wife and have grown up and gone families and found a wonderful little house over built in some ways in the mid 1950s and while it had a family room ( with fireplace ) in the basement the ceiling is too low by today's standard so it and the attached wine cellar became mine for a work shop and I was not about to let a static arc start a sawdust fire I wouldn’t have a hope in hell of stopping once started and a nice work bench with drawers at one end of the workshop hides the fireplace.
I attached a few pictures taken a few years ago when I first set it up ( the joint pics with 4 years of cobwebs taken today ) and I’ve been running it now for almost 4 years with no trouble, I've added/ altered here and there but not much
1. because of the low ceiling I used 24” tie raps pushed through cutup pieces of plastic ( they give away to put on gal paint can handles so they won’t cut into your hands ) screwed into the ceiling.
2. I used the wine cellar as a dust collector room with cyclone trap and built a hollow door with 2” pleated filters built in to allow the air being sucked out of the workshop room back in FILTERED and bought a dust collector with a proper pleated filter rather than a bag as you will find very fine dust passes through the bag.
3. I ran bear ground wire through all the piping on the inside and drilled a simple hole for a machine bolt to connect to outside wires at joints, elbows etc. Do not glue the pipe together as there is no need, then you can take it apart to clean it out if need be ( I haven’t had to ) as well it make it easy to make changes.
4. The ground wire is connect either to the machines of the ground on the receptacle the machine is plugged into including the dust collector itself.
5. both my dust collector and edge planer are 220/240 so I had a friend in the HVAC business salvage me a “ definite purpose contactor “ from an old roof top A/C unit being scrapped. That device basically handle/switches a 220/240 heavy load OFF and ON with a 24 v circuit it generates so I hooked up switches all around my shop and painted the face plates yellow. Turn any switch on from any ware in the room and the dust collector comes on ( total cost 6 surface mount receptacles / cheap light switches and plastic switch plates painted yellow 100 ft roll of light lamp wire ). If your dust collector is 110/120 you can purchase dust collector system from the various wood working suppliers.
Hope this is helpful maybe give you an idea or two.
Making stuff is making fun as long as you do it safe.
Last edited by gwizz; 12-27-2012 at 01:17 AM.