pyramid tent features

Much of this noise is lower in f

Much of this noise is lower in frequency, so not too bothersome, but it is important to address noise throughout your dust collection and ducting efforts. I put the wire through the hole then wind tightly around the metal flange at about the same spacing as the coils in my flex hose. All of my other machines use anything from 4" down to 1 1/2" dust ports. Use a Small End Coupling (male) for connecting pipe to pipe and flexible hose to pipe. That screw also secures the open edge of the block and squeezes down on the clamp to hold the clamp in place. One of my test impellers exploded inside my blower. For saw blades I strongly recommend use of hoods that incorporate at least a splitter or riving knives plus use anti-kickback pawls.

We end up calculating the surface area of a sphere with a radius of just over 15 inches, convert that to square feet then solve this formula and find most small shop tools need right at 1000 CFM airflow for good fine dust collection. Now go back to the small piece and try to breathe through it quickly. That approach works and is kind of fun, but very labor intensive. This also means our tapered and smaller adapters from our ducting to our tools are all but useless because they also kill our needed airflow.

With just one ducting run at a time open, we need much simpler ducting designs than the commonly recommended graduated ducting designs that collect from all tools working at the same time. Most used a slide that slips out of the way leaving an open track that will pick up sawdust even if the gate is set with the slide pointing down. Your blower design has a rectangular outlet that will not fit anything! You need a way to go from your 6" round ducting to your filters, your blower, your cyclone, and some tools that have square or rectangular duct. The sprial duct has one end crimped to form a male end which always go placed closest to the dust collection system. My cyclone moved more air and also separated off the material before it got to the impeller so worked well with my new floor sweep. Do not use a dust collector as a vacuum because any steel screw or nail picked up hits the impeller and can put a spark in the collection bin.

With a two-stage unit using a separator or a cyclone before the blower this becomes less critical. These experts share how to avoid these piles. That combination creates piles of dust in the ducting just waiting for a spark for the duct airflow to quickly blow into a fire that the PVC will make worse. If you purchase the ductwork the drawings are free. That 4000 FPM when pulled through more than about 40" of 4" diameter duct will end up with a total air volume of 350 CFM. Plus, it is unpleasant to listen to this dust rumble around in the ducts. It works well, is plenty strong, is easy to shape, and it costs 1/3 or less the cost of the other forms of pipe. It moved less air than my dust collector, just about half of what the vendor claimed in the advertising. PSI sells an inexpensive muffler that saves about 10 dB, but it only fits a 5" outlet that is too small. They cost more but make tight joints that normally don't need anything more to hold them in place with a good seal. Quite a few have made their own mufflers out of perforated pipe wrapped with screen then with fiberglass followed by being slipped into a larger tube. They carry a copper airline, a water line, additional 110, 220 & 440 power, and the dust collection mains. Take a look at my for more details on how to build your own muffler. With limited ability and patience to play with ducting I am now using higher end steel sprial ducting that mates with cam action sealing laser welded steel duct fittings. under the floor using easily removed tiles mounted on stands. This duct starts off as a flat strip rolled into a spiral. The traditional way to build a transition is fairly simple and also works well, but takes more time. I was only able to make the aluminum tape with a backing like double-sided tape work on the inside. We know that the slightest breath can move the fine airborne particles, so to keep the fine dust from being blown all over our shops, we need to surround the working areas of our tools with air moving fast enough to overcome normal room air currents. To get that length I drew a full sized circle, then divided the circle into sixths, then twelfths, then twenty-fourths. For my first, I carefully designed and put every hole just where it needed to be. This will work but not nearly as well as a 5" and a 4". OUCH! Benefits of Air Handling Systems Hobby Shop Ductwork include: Ductwork available in 3 7 diameter. SDR-35 is the "common name" for the 4" and 6" range of this product that has thinner walls than normal schedule 40. His saw pulleys increase the blade speed closer to 4000 RPM so the blade tips launched the dust even faster. Not only does turning our blower motors on and off use up lots of extra electricity, the top motor makers recommend no more than six on off cycles an hour or our motors will get too hot and burn up. This table from AAF shows what airflow measured in cubic feet per minute (CFM) we need to collect at each type and size of woodworking tool before it can escape. "With regards to cyclone noise, I work in automotive and one product which probably be good for reducing cyclone noise is what we call peel and stick mastic. Most home insurance inspectors, building inspectors and fire marshals will fail almost all small shop dust collection solutions due to serious safety concerns. He also posted that article on a woodworking forum and gave me permission to include a link to his article.

I also mounted my square wash tub to the rotating portion of my saw so when the blade rotates the tub stays centered behind the blade.

This creates a pipe with six (or four) cuts that with a little squeezing becomes tapered losing just enough diameter to fit tightly into my flex hose. This makes for more noise but results in great fine dust collection, so now all of my cyclones and those sold by Clear Vue use these oversized blower wheels and higher horsepower motors that move a real 1200 CFM through 6" diameter duct with plenty of extra air speed for good pick up and to keep the vertical runs clear. The second is a simple box with a throw. I also tried putting the cyclone outside, but it was way too close to my wife's study/craft room and it quickly found itself back inside. I seal them just in case with the aluminum tape. They do look pretty but greatly increase the cost of your gates, don't seal well, are razor sharp so will cut with even a small touch, and unless modified don't fit either standard dust collection pipe or even 2729 S&D PVC. Also, after making sure all fits and before my final assembly into the PVC, I pull out my flux and solder the HVAC transition up so there are no air leaks. debris That's why we measure blower performance in water column inches abbreviated W.C. At this typical pressure a 4" duct will only move 350 CFM with an internal ducting speed of around 4000 FPM. Shops subject to commercial fire marshal inspections are not allowed to use plastic duct. Why? I also tried spray coating the cyclone outside, but that did not seem to help any more than just spraying the inside. Another approach is to mount blocks with regular stainless steel band clamps. The extension also increases the hood face velocity by minimizing the open face area. Too little airflow plugs vertical runs and builds piles grow in height then grow longer and longer in horizontal runs. coupler dct On the test bench my cyclone was over 100 db. To hang you can mount to the ceiling, use a tape measure to get a consistent distance and equal length loop and then bolt that tape around your duct. Cost and convenience often end up with many shops having a concrete slab floor. The only way to capture the fine dust as it is made is to start with hoods that block the fast moving air streams. He was really upset at that air quality test and soon called me back ordering me to give his shop a retest. Again the research followed by decades of refinement show what we need in terms of hoods and what is needed in terms of total airflow. This results in very smooth clean transitions without all the nonsense of expensive transitions. The supplier I use is an industrial irrigation and plumbing supply firm and their product has an ID that is dead on at 6". Even with a lot of practice I either make all on a template or end up having to redo too many. Thanks for sharing Stan! I drilled a hole near each pipe end through both layers of foil, inserted a 1/4-20 screw from the inside of the pipe, put on a nut to make a good circuit, then connected each section using 14 gauge wire. The green shaded blocks are what most who use standard 7" diameter duct should use. The 2729 PVC is rated for many times the pressure that even large industrial blowers generate. At typical airspeeds and pressures for dust collection, air is virtually incompressible. The flex hose absorbs the vibrations. At a microscopic level wood consists of dry very brittle tubes, so every time we work wood with blades, bits, cutters and sandpaper these tiny tubes explode into millions of fine invisible airborne dust particles.

If you need to pick up larger chips and small blocks you will need to step up to the 4500 FPM airspeed. He said they have great prices and are willing to ship UPS. With my constantly adding and changing tools as well as my shop layout, I rapidly grew to hate the HVAC snap lock pipe, so shifted to use spiral pipe which actually cost less and was easier to work. One system I tested had so many leaks from installing the gates backward that he had less than half the total airflow that we got after reversing the gates so they sealed well. For instance my table saw came with a single 4" diameter port. To make sense of this on my other pages I share a simple experimental game moving a balloon and two straws. He shared his way to eliminate those nasty static shocks, "Our product was plastic and our conveying systems both air and mechanical were plastic. Click here to view more information about the ACS ducting design service. The rule is never hook a dust collector or cyclone to any size pipe less than 3" in diameter. They built static calculators like the one linked here that estimate the resistance created by our ducting, flex hose, duct fittings, hoods, filters, cyclones, separators, etc. Also, many of even the expensive gates get clogged with sawdust that prevents them from closing fully. This also means with our dust collectors and cyclones only able to collect from one tool at a time, we must design our ducting with all the down drops the same size and horizontal mains of that same size or at most one size larger. They also share the air speeds measured in feet per minute (FPM) we need to pick up various materials including sawdust and chips. We often use wyes on our down drops to split the flow to mate with two or more ports on a single machine. Here is what I did and it worked well to help me install my aluminum duct tape inside my duct. Use a Large End Coupling (female) or short piece of spiral pipe for connecting fitting to fitting. If you are still concerned, go read his information. My engineer friends at Dwyer Instruments that build most of the air measurement meters say roughly 10 diameters of pipe will both stabilize the airflow and set that airflow to about the same duct speed as your main. Size spectrum is 3 7 diameter. I recently did air quality testing all over the State of California. I tried it and measured the airflow. As discussed before we need at least 3 hp small shop dust collectors or 5 hp cyclones and then can only use 6" diameter duct for verticl runs which unless we use oversized blowers will only move 785 CFM. If your shop is going to be subject to a building inspection, fire marshal inspection or insurance inspection, then you need to use all steel ducting. Light 26 Gauge Spiral Pipe perfect for a small hobby shop with a max 3 HP dust collector. There are huge quantities of surplus very well made raised computer floor that provides a raised floor of 8" to 12" to permit running electrical, communications, cables, etc. The fold lines in this view are red. It almost made it, but his metal calipers got turned sideways at the second bend and jammed in so hard it locked in place. I made your cyclone and low cost blower for $167 from your Build Budget Blower web page using a 14" Jet impeller and HF 5 hp motor. If you want to make it easy on yourself and still get a workable number, just pretend that there is no wye and calculate static pressure based on having a single length of flex hose the same diameter as the down drop with a length the same as the longest leg after the wye. They found almost all small shop stationary tools get good collection of the same sawdust and chips we would otherwise sweep up with a broom with just 350 CFM of airflow. So although many use flat HVAC connections it is far better to use actual dust collection ports that have a really nice curved inlet. You can do this with a muffler or a long length of heavily insulated HVAC flex hose. This is why I am so hard on the popular cyclone maker whose graduated ducting designs use 8" mains with lots of 4" down drops on their systems that can only support one machine running at a time. The standard 4" connections on our larger hobbyist machines kill the CFM below what we need to collect the fine dust. The only way to prevent this is to have good hoods that keep the fine dust controlled and move enough volume of air to capture it before it gets launched. His dust problem was simple. (If you use a thick kerf blade only make two cuts!) If we use too small of ports, duct, fittings, or outlets, or we use too rough of duct we kill the airflow needed for fine dust collection. Good "chip collection" collects the same sawdust that we get with a broom, and good fine dust collection provides good "chip collection" plus also collects the fine dust ample to keep our air quality below one of the different air quality standards.

There are lots of ducting choices and often we slip into a mode where we think if something costs less it is not as good. Chip collection has been a requirement in many areas since the 1920s so is well understood. Additionally, air engineers have studied almost every brand and size of tool to determine how much airflow is needed to provide good chip collection.

However in dry climates, static can be a real pain around tools and doing a better job of grounding your dust collection piping is worth doing. My dust collector came with an upper and lower filter bag that worked poorly and required constant emptying because I made lots of dust from preparing rough stock. They also improperly locate our equipment, store sawdust to create a serious fire hazard, and generally use undersized far too open filters. My friend who has done this for years made this look too easy. For tools that have two ports like a table saw, use a 5" duct to the larger cabinet port and a 4" to the smaller blade guard port. All wye (Y type) takeoffs need narrow angles. Because air at typical dust collection pressures is incompressible, normal dust collection blower pressures will only pull about 875 CFM through a 6" diameter duct. I beat this with a simple but nice solution building a simple thread into my pipes that the duct can screw onto. Volatility in the steel industry has led to unprecedented steel price increases since August 2020, and this surcharge affects all Nordfab distributors & customers. A bell shaped (hyperbolic) curve eliminates most of the problems from the air coming from the sides and back to reduce resistance and increase flow. I also have slowly been adding other hood designs that work well: Random Orbital Sanders NIOSH Recommendation. And, it does help to dampen the noise considerably. Notice that corrugated duct is so restrictive it should never be used! When you have the tape through the PVC, stick the aluminum tape to the end of the PVC pipe. These piles pose a serious fire hazard as any spark can quickly get fanned into a dangerous ducting fire. A good working system must move the amounts of air we want for good collection and ensure the air speed in the ducts keeps the dust entrained, meaning kept airborne in both the mains and the down drops. Then use 2" sheet rock screws to secure the heavy nylon cable tie mounting brackets into the supporting studs. The easiest way to install the nylon cable ties is to use screw in mounts designed to work with these ties. The first was Jim Halbert in 1995 and shares on a YouTube video at (click here). The difference is almost all large commercial facilities vent their dust collection systems outside, so they rarely build up the fine invisible fugitive dust that escapes collection. We all know from using our shop vacuums on blow that blown air will hold together for many feet and blow stuff all over. Steve Cater built his shop and put his 4" ducting under the floor, but not in channels. These two are with the largest manufacturers (Lindab and Nordfab) and offer top quality all USA made smooth seam laser welded steel ducting with clamp connections. A 2 HP dust collector capable of 1200 CFM is lucky to provide 450 CFM. We can either use expensive dust collection wyes or do the metal working to change the male and female ends. Just a little hand sanding on the hole leaves a near perfect joint. Visibility - A good hood also in my opinion needs to let us see what we are doing. With my oversized blowers you can use 6" diameter to each of our larger machines. (my thanks to Dave for reminding me that under typical dust collector pressures air is virtually incompressible). The wrong pipe size, leaks, fittings that change the air to abruptly, overly long runs, an inefficient separator, and a poorly designed cyclone can each cost far more CFM loss. Many buy or make poorly designed blast gates and get very frustrated. Putting the tape on the inside was an interesting challenge. I also tapered each of my trenches with just a little grade and put drains at the end of each trench. These pieces are called transitions. The experts also did considerable research which they have refined with decades of testing to work out how much air volume is needed at each size and type of tool to get good chip collection and get good fine dust collection. I hot melt glued in big neodymium super magnets on the front of that sweep to collect nails and screws before they get sucked up. That is why you only want to buy from a firm that either will replace anything that does not arrive intact or buy locally. One leg of the wye will connect to my machine dust port and the other goes to a movable hood, often with a super magnet to hold it in place. I got a big surprise when my heavy blower collapsed the light HVAC pipe. Industrial weight Hobby Shop Flexible Hose offers great flexibility and smooth interior. To reconfigure just release the clamps, make the changes and then reclose the clamps. There were other problems with HVAC ducting. There are many nice accessories that you can use with your dust collection, but realize that even with these accessories a dust collection system does some functions poorly. My first accessory mistake was buying a transition that mated my 4" dust collection hoses to the tiny 1.25" port on my band saw. Slip the duct into the loop and use an adjustable stand to hold up the other end of the duct with spacer in place when needed.

Although heating PVC gives off very dangerous fumes that you need to protect yourself against, you can do magic with a heat gun or two and PVC. The second is Alan Schaffter and he shares his information at (click here). This means duct sizes must be much larger for a good fine dust collection system because these systems must move lots more air. Instead, as McGiver would do, whip out your Swiss Army knife and duct tape. woodworking dust fittings w1055 durable flexible hose pc kit They also provide equations to help us properly size our ducting. extractor lumberjocks

Sitemap 0

Much of this noise is lower in f