much for one vendor's touting th

2022.07.31
why does my kitten chew on everything

much for one vendor's touting th

So much for one vendor's touting their non-sparking impellers. I was stunned when my professor friends and I tested every major brand and size of small shop dust collector and cyclone a few years ago. To size our blower motor we simply look at this same impeller at our minimum resistance level. Once I put the top piece of plywood on, vacuum from the blower pressed the plywood oops!

Try it again while sucking. plywood. I strongly recommend use of steel backward curved material handling impellers. Most vacuum cleaners produce around 1000 mm of suction when blocked. (both motors are capacitor run motors), so by those indications, the motor But I wasn't happy with the performance of my blower, certainly not compared With these corner registration marks you can print a full sized layout including the spiral that many find difficult to draw. | The resistance is a measure of how much work our blower has to do to overcome the friction in our ducts, to turn the corners through wyes and elbows, to pull through a restrictive hood, and to push through a dirty filter. Small, lightweight, silent operation, and a strong air In short, I strongly recommend against buying any cyclone with an aluminum alloy impeller and instead buying a good well balanced steel impeller. Experimenting some more with a temporary housing. Dalam percobaan Tetap menggunakan triplek dan plastik. The blower inside needs to be tall enough to have some space above the blower blades to pass chunks, 1/2" below the impeller, plus the height of the impeller. The blower wheel will shred anything that falls Since these blowers are high volume and the outside flange on the blower fit perfect in the drain. I chose to try this fan because I want to mount it outside of my garage, and these are outdoor rated. I had this blower for my kids jump house. Almost all small shop vendors error by supplying their larger cyclones with only 14" diameter impellers and only 2 or 3 hp motors. As discussed before if you choose to use the gravely undersized motors this vendor sells, this startup load is a serious problem because it can quickly cause a motor to burn out from overheating. Because the normal fixed speed 3450 RPM induction motors we use to power our dust collectors are made to pull starting loads six or more times their running loads, our vendors can get by with quick tests at these kinds of horsepower loads. Many browsers automatically rescale the picture to fit on a single screen. to bend a little, and the impeller rubbed against the housing before it got up they use in the fabric, it alone tends to restrict the material. The downside is that this particular blower is not very strong, it was for the littlest jump house you could buy.

that cause lots of internal turbulence and disrupts flow. Talking with the testing groups that ran some recent woodworker magazine cyclone tests they had the same problem and burned up three cyclone motors when testing. Build your own Most get their impellers with a 7/8" arbor, but the gripping portion can be ordered with your Clear Vue impeller with some larger sizes. They are meant for a high pressure blower that has the strength What you need for ideal performance is your impeller turning with the blades rounded portion leading and the cyclone built so the inlet causes the incoming air to turn in exactly this same direction. Once it balanced level on the marble, the vibration problems This works better giving our full 1000 CFM when plumbing with 6" diameter ducts in almost all typical two-car garage sized shops. Figuring out the outlet height is easy because it is the same height as the blower height. at a surplus store years ago. Since I first wrote this page NFPA has acknowledged this thermite generated fire problem and now no longer recommends the use of aluminum and aluminum alloy impellers. Add the 3/16" top and bottom grooves to trap the blower sides, and we get an even 6" to have our metal or plastic dealer cut our blower sides. | Remember that these firms I have helping do small shop owners a favor. We need a nice smooth curve that gets keeps right distance from the impeller. Please recognize we are working with dangerous power here so you need to ensure your work is safe and the results meet local code. ************I updated the picture to reflect the proper attachment of the hoses. Additionally, it is a hell of a lot quieter than any shop vac. To make the round fit on the rectangle, we need to hammer the corners square to make the height match the 5 5/8" blower height making the width 7". For the Jet DC-1900 14" impeller that is 3 5/8" tall we can use 1.5" above and a 1/2" below for clearance giving an inside height of 5 5/8". Start by looking over the Build Your Own Airfoil Blower instructions; Mungkin kalau para pembaca tahu Fortunately, unlike the airfoil, material movement impellers can have up to 1/2 of their blade width sticking into the outlet air stream. Sadly, all of those kinds of posts rapidly vanished from the major Internet woodworking forums whose livelihood depends upon vendor advertizing. I would rather not discuss Buy a 7/8" shaft (I'd use plastic and Gary found a socket the right size). With that sized outlet the next question is how to make the spirals for the blower top and bottom. and finally, by gluing a small block of wood to the side that was too Some of Since we now have good sources for larger impellers I strongly recommend using one of them to get the larger airflows required for better fine dust collection. It took me multiple tries to get filters that were not destroyed during shipping. foot wide. This tells us clearly we don't ever want a 2 hp motor because during normal average every day dust collection it is working at over 100%. At 4" of resistance that impeller moves 1543 CFM while pulling 3.09 hp. Alternative Impeller When Clear Vue closed for a short while my son went back into making cyclone kits. I mounted this impeller on the motor shaft using the choke the exhaust down with a dust bag. Mastercarver Systems | mounting flanges that previously held the saw blade. This same vendor also states on their web pages that steel impellers are a major fire risk and do not comply with the National Fire Protection Association (NFPA) guidelines. Note that Lock-Tite is a must for this application to keep that bolt from coming loose. I'm not concerned about a bag to collect the 1-2% missed by the cyclone since it will be mounted outside. dust collector homemade blower diy motor woodworking tools plans google workshop wood impeller para projects table Neither Camil-Farr or Donaldson-Torit had their coatings on the filter insides, plus most were having serious shipping damage when they ordered their filters.

Divide that by the blower height of 5 5/8 gives a calculated minimum width of just over 5". Once we know the size of that "bubble" we can use the sphere surface area formula to compute the area of that sphere where A=4*Pi*r*r then put in our 50 FPM airspeed and that area with a little algebra into our air formula FPM=CFM/Area to calculate our needed CFM air volumes. At 9" of average resistance it only moves 767 CFM and draws 2.05 hp. We can use the same blower table and see that a 14" diameter impeller is so challenged by resistance that it does not even perform once over 11" of resistance. Gander Mountain (36" Cotton Camping Although the 14" diameter impeller and blower is a workable plan, it really does require all 7" diameter ducting to move the real 1000 CFM we need for good fine dust collection. Our small shop vendors instead rate their filters after becoming "fully seasoned". At the minimum 4" resistance level this 14" impeller uses 3.27 horsepower to move a maximum 1377 CFM airflow. To make it work you need to make a custom blower housing and carefully ensure with an amp meter that the unit does not over stress the motor on start up or when running. So I lengthened the blades Look and ask around. Link Exchange | This sizes our ideal impeller at 15.5" based on that blower table. The result moves more air with only a little loss in fine dust separation. Slid the duct This template ends up being sized perfectly to make the groove in the top. such can be treated as a linear system as long as one uses air speed squared, Because this fine dust lasts nearly forever unless it gets wet, if vented inside it can build to very dangerous levels. Going with it the right way with the curve pointing into the direction of rotation will save you about half the power and cost you about 1" of overall pressure. This makes them much easier to clean with either a little machine shake or blast of air. So I used a 1/3 HP 3500 RPM motor from a tile saw that I picked out of a dumpster. on the optimistic side. This floor drain from Menards looked a perfect fit. and it was! The Cincinnati Fan pressure blower table shows we need at least a 14" diameter BC impeller turning at 3450 RPM. serve the purpose well. This same NFPA guideline also requires either putting our cyclones and blowers outside behind a suitable explosion barrier or using certified fire and explosion proof cyclone equipment. the bag. low pressure you need to be concerned with how easy the bag will release I used it to vacuum up loose dust from my table saw pretty effectively. We also know we need heavy duty steel material handling impellers to ensure we do not break our impellers with inevitable material hits. He said the normal single phase heavy duty motors come in 1, 2, 3 and 5 horsepower models. sawdust lines the inner surface of the bag it becomes a pre Trimss. Regardless, with all turning the right way, I now have a real blower that can instantly turn into a Dust Collector with a couple of bags and it totally blows away anything else available under 3 horsepower at four times the expense; Buying a single 4'x10' sheet of 24 gauge galvanized steel and spending another $24 on solder, playing with my new Harbor Freight spot welder upgraded with the longer reach tongs instead of screws or pop-rivets, lots of careful layout following my cyclone plans, my hand sore from all the cutting, carefully rolling, spot welding, and then gently soldering all sealed air tight using my propane torch; Since motors need the same power to turn the same sized impeller, the operating costs are near identical without having to worry about replacing motors from being overheated too often. Humm. I now have a few impellers custom made with the compression arbors, or you can buy a commercial blower and impeller. Most of the impellers and especially the blower housings were incredibly poorly designed and even more poorly made. filter of sorts, especially after a few minutes when the dust bag becomes project involved a lot of experimentation. Create the spiral template by unwrapping around my appropriately sized cylinder. Sadly most small shop woodworkers and even most vendors wrongly assume that the roughly 350 CFM that provides excellent "chip collection" at our larger tools will also provide plenty of airflow to pull in the fine dust we know we can move with the lightest breath. Motor yang saya gunakan adalah motor bekas mesin cuci. largest blower will filter no more air than a small blower with a large, When I first put up this web page in 2000 the only affordable sources for impellers were the 14" diameter impellers we could buy as replacement parts for the larger 3 hp dust collectors. pitot tube pressure to air Nice. and neglected to take more pictures. If your printer will let you rescale the printing, simply print out the 14" full size at 107% and the resulting drawing will be right on for a 15" impeller. This same cyclone vendor strongly puts down steel impellers on their web pages implying that steel impellers are so heavy they ruin motors from the high starting loads. I'll focus on the blower. Note the ends of the blade tips point away from the direction of rotation. Next you need to decide which sized blower you will build. Unfortunately, they had to so choke down their impellers that not one in real use working against typical shop higher resistance levels with real ducting sized as they recommend moved a real 800 CFM let alone the 1000 CFM we need for good fine dust collection. A 6" round duct and 6" round cyclone inlet each have an area of about 28 1/4" square inches (Pi*(D/2)^2). the end result is the same..dust goes in the bag! The recess also holds the gasket seal (just a piece of stick on foam insulating tape). As a result, we have to collect the fine dust as it is made. berimprovisasi. Many who have purchased standard blower impellers don't realize that most impellers are designed to work on motors with horizontal shafts. Used my 5/16" router collar and a 1/8" bit to cut the top spiral going slow to keep the bit from overheating. unit. penyebabnya bisa tulis di kolom komen. Agar bisa dipasang di motor, saya pesan adaptor ke tukang bubut. and covering that with a sheet of To cover a large area with sucked air we have to move a large volume. I have already had one welded impeller I was testing fly apart from those turning forces. The motor on the right is a standard mount and it has its cooling holes in front next to the motor shaft. Next, we have to add the resistance of our filter which changes over time. don't want much do you? F.A.Q How I got to this recommendation is a touch complicated. Unfortunately, the more often we clean our filters the shorter they last. cleaner yang saya pakai. If you do so, then you need to also inset your fender washers so they hold the blower on tight. Add that to mounting this motor in the hottest place in our shops and 3 hp motors will eventually burn up. I have not hit the ground so quickly since in the Vietnam War. Using no overlap creates a huge blower. If you cant easily breath through the fabric by holding motor/fan unit shown earlier, the motor's power consumption drops in half when I experienced that myself with an early aluminum impeller. Unfortunately, almost all stationary tools come with little to no fine dust collection built in. It's definitely not strong enough to attach to a table saw. pattern for router template to rout spiral, 5 ea. difference of a spinning disk of air, air density and I looked up pitot Tube on

Foolish or dedicated, I did so anyway for two more firms. A small, tightly woven material as a bag attached to the is blocked. That meant we need two of the Farr filters or three of the Donaldson-Torit. the bag to the blower case either sew in a large rubber O-Ring or elastic into the neck of History | or just using pitot tube pressure as the flow rate. The biggest disadvantage of the aluminum alloy impellers is the NAFTA no longer allows them in new systems for commercial use because when hit with metal aluminum impellers launch white hot sparks that can cause fires. The stuff trapped in the filter pores improves filtering by up to twenty fold in a fully seasoned filter, but also increases our resistance significantly. Epoxy the 3" length of PVC pipe into the hole with one end flush with the work Another frequent complaint with the aluminum impellers which also gets quickly deleted if shared on the Internet forums is the problem with these light aluminum alloy impellers slipping down the motor shafts then self destructing when they hit the blower housing. neighborhood. So I glued on the second layer of my impeller. medium weight material bag. Be sure to check with them before committing to a motor with a larger motor shaft. (adsbygoogle = window.adsbygoogle || []).push({}); I made a six-bladed impeller out of some pieces of pine and some 1/4" I focused on building the centrifugal separator for my dust collector The silver impeller is a Cincinnati Fan aluminum impeller that turns clockwise. A 1.0 service factor motor can run at 100% of its rated amperage without overheating. Amazon Daily Deals You will need to talk to them about pricing, availability and delivery. speed table. The smaller the filter area the faster the dust builds, the more the airflow gets killed, and more often we must clean our filters. Used Blowers- After three years of sales I was about one third paid back when the engineer I worked with left Sheldon's and that firm was sold. This looks great! Under the impeller I needed to add a shim and bushing to put the impeller at the right height on the shaft. Calculating the maximum resistance is a little more difficult. The warmest place in a shop is at our ceilings or between rafters. I listed a new blower from Grainger's below that works excellent if you cant shown here are often over powered if anything, since the same motor is used Using the grate I took out of the floor drain, I lined it up to the intake side of the blower and marked the 3 mounting holes. This site shares what I learned about the fine dust hazards and what how I protect myself and my family. It may This is called seasoning. This heavier junk we can suck up can severely damage any lightweight impeller and even cause them to explode. This means we can look at any good commercial fan table and use that table to size our impeller, our ducting main and our motor horsepower requirements. Created: March 2000 Blower technology is mature meaning the same size and types of direct drive blowers all provide near identical performance from all the top vendors. After considerable experience and lots of testing with the 15" impellers I decided there was enough unused capacity in our 5 hp motors to turn a larger impeller. The ideal inlet for that 14" impeller is 10" from my fan table on the Dust Collection Basics page. As our filters age, they wear out meaning the pores get larger and larger until they no longer trap the finer particles. That's about the same static pressure that my big dust collector produces, homemadetools My first impeller That really means we need a 5 hp motor and should be turning either a 15" or 16" diameter impeller. I started to wonder if the 1/3 HP rating of my tile saw motor was perhaps Barry asked me to define my needs. it would cost to buy a 1/3 HP motor alone. This distance works fine without excessive noise. If we look a few entries lower in the table we see this same impeller and blower with a 8" opening and 8" main will move 1108 CFM and draw 3.61 hp. Because the ducting sets the maximum airflow, I can size the blower inlet to the cyclone outlet. The blower table shows this impeller will move a real 1022 CFM at 12" and draws a real 3.44 hp.

Used my band saw with the pieces still together rough cut the blower top and bottom pieces, followed by a sander for exact shaping. It goes counter clockwise when looking at the impeller with the motor behind just like my Jet impellers.

I told Barry I like Baldor motors because my earlier projects used Baldor motors extensively. Air engineers long ago learned we must capture the fine airborne dust as it is made. At the maximum 10" resistance level this 14" impeller only uses 2.34 horsepower but it then only moves only 846 CFM. Material yang saya pakai adalah triplek. Which ever way works best for you, Sources for pre-made bags- Cost is under $100 the last I checked. A light piece of This 15" impeller and blower design with 5 hp motor became my standard in 2004 and the standard used by Clear Vue Cyclones. To make your own dust collector follow Although aluminum alloy impellers are cheaper to make, the major commercial blower makers strongly recommend against use of aluminum alloy impellers for dust collection. (adsbygoogle = window.adsbygoogle || []).push({}); Mounting it in the housing and spinning it up, it ran much better than my the bag through the inlet at a rate in which the air can leave the fabric of This unit has just a 1/3 HP motor, yet it With no impeller attached fire up the motor. Kindle Unlimited Membership Plans Today there is no question that due to filtering efficiency I recommend and personally use the Wynn Environmental "Nano" filters, but you can still get their Farr compatible 300 square foot 0.5 micron filters (9E300BL). This is still accepted, but tests by the U.S. Bureau of Mines and others have demonstrated that impact of aluminum with rusty steel creates a Thermite reaction and thus possible ignition hazards. 3/8 nylock nuts for carriage bolts, 13 ea. It will not move enough air with a single 4" port. by sliding a block of wood over where the air gets pulled into the filter box.

The startup load is so high that it takes at least ten minutes of running to get rid of the extra heat. let people remove parts for the asking. Unfortunately a full dustbin, a plug in the cyclone cone, clumps of debris, a large surge of dust, or an air leak turns our cyclones into little more than a pipe that passes all right through the blower. I removed all the screws from the blower to sperate the housing. I had a whole bag of marbles put aside that that would "For many years aluminum alloy impellers have been specified to minimize sparking if the impeller were to contact other steel parts. Cutting into each corner and bending the top and bottom at ninety degrees provides plenty of attachment area for a good tight seal. Although this works well and makes for a tough impeller, the result is only one step removed from an air raid siren in terms of noise. again by gluing pieces of wood onto them. That is double nonsense. Put in place the metal blower sides and securing them together where they meet.

The parts required are available from McMaster Carr and Orchard Supply: 1/4 nylock nuts for motor plate bolts, 4 ea. If the impeller is on, it can destroy your motor and severely hurt you!. flexible duct hose to the blower inlet. Anything smaller for a down drop will reduce the flow enough that there is not enough airspeed to keep the mains from plugging or building up ducting dust piles that pose a serious fire risk. Most larger woodworking facilities use pressure sensors that set off a cleaning buzzer when the filter resistance gets more than 2 to 2.5 water column inches higher than the seasoned filter resistance. The larger the bag you use the more surface area you with a hand drill, a regular tap, and a bottom tap. Most commercial shops and small shop woodworkers choose the blended filters. I now have a machine shop make impellers for us and also have another firm CNC cut MDF top and bottom pieces to easily make a blower to work with that impeller. Unfortunately, if these loads go on for a few minutes the motors will quickly overheat and burn up. It can also rapidly build up on non self cleaning impellers, create a bad out of balance condition, and cause our motor bearings to fail. the fabric with sawdust seconds after you turn it on. draws 415 watts. 9 out of 10 times it's because of another problem, the blowers are generally purpose. The red impeller is a Jet and turns CCW when looking at the vanes.

Most small shop dust collector and cyclone blowers, in fact all the major brands except for Delta, Jet and Powermatic had blowers with very poorly made housings. The pictures here are for either the Jet or our counter clockwise rotating impellers when viewed from the vane side of the impeller with the motor positioned behind the impeller.

With the outlet Generally when asked this question, if you have a 3 hp dust collector then I recommend using it vented outside. Regards, Gary French If smaller than 3 hp then I recommend selling your existing dust collector and using the money to help pay for a good motor and impeller then making my budget blower. I then put on my web pages not only my motor wiring diagrams, but shared the circuit, building instructions, and parts list for the nice remote controlled switch that Jim Halbert designed and was kind enough to build for me. pake sealent bang buat nutup celah udara nya. Since circumference = Pi x diameter, we can calculate a diameter for our center. The consensus was both of these firms are really only setup to service large commercial accounts that regularly order large numbers of filters. Drill two But with the motor spinning at 3500 RPM, and the center of mass I got the same test results with either the Jet or our impellers.

An over sized impeller is required if you have a high resistance, but if it is tested without that resistance you get the incredibly high CFM numbers that so many of the less reputable vendors advertise. Material sama yaitu triplek dan ditutup plastik. OnceIhadagood sense for what size impeller and enclosure I needed, the impeller is a series of curved blades sandwiched

The American Society of Heating, Refrigeration, and Air-conditioning Engineers (ASHRAE) is considered the world authority on filter measurement and performance. Then continue the 2" PVC to 3 drops. The bottom line is Jet requires a full 3 hp motor to power this impeller with a dust collector which does not move as much air. Those who live at higher altitudes or who have 50 Hz power so their motors turn slower needed a bigger diameter impeller so I designed the 16" diameter impeller and blower to compensate. For dust collection we use material handling impellers. plywood, I was finally able to get the motor to run at full speed. blower. I tighten the three screws and done! If you then check a good fan table you will find you still need the same 5 hp 3450 RPM motor but need to upgrade to a 16" diameter impeller such as offered by Clear Vue Cyclones. Even if our dust collection system is 99% efficient that still means every twenty pounds of sawdust leaves our shops filled with enough fine dust to cause 150 average shops to fail their EPA air quality tests. Although many recommend the OSHA air quality levels that we can get with 800 CFM, I strongly recommend using medical and EPA recommended air quality levels that instead require at least 1000 CFM airflow to our larger tools. hose over the PVC pipe adapter and secure with an adjustable hose clamp. have to use in filtering air quickly and the faster your air flow into the Now draw around the template using a 1" spacer to get the outside cutting line. Conversely, we can only feel the sucked air out to a couple of inches. 3/8 lock washers for motor mount bolts, 1 ea. | Regardless, these Leeson motors are real 5 hp motors, not the inflated hp motors used on some vacuums and inexpensive air compressors. These arbors worked but even with their special star tipped set screws that dig into the motor shaft they could let the impellers slide plus these screws need replaced every time you remove the impeller. seen large blower wheels run by small motors that slow to a crawl when you Polyester has the benefit of lasting about four times longer than the blended filters but they cost more than twice as much and require labor intensive washing as well as the normal machine shaking/blow down type cleaning. Required fields are marked *. I made this dust collector with parts I had on hand. We normally calculate the worst case ducting situation in our shops to allow us to later move any tool to any location. Any except heavy duty motors built to handle these high startup loads will burn up. My shop is larger than normal so knowing there was available extra capacity in my 5 hp motor I used the 16" diameter impeller and blower with my standard 18" diameter cyclone from my cyclone plan pages. Otherwise we would be forced to wheel our dust collector or cyclone right next to each tool. Kok di stickernya seperti 1.400rpm krn sy jg mau buat dust cllctr gitu mass Use a constant tension and swing the arc on the template making sure it stays right on. from RPM and impeller size. The blades all We have to calculate our highest resistance ducting run then add the resistance of our filter, which changes over time. It also sizes our main at 6", 7" or 8" and it also sizes our minimum down drop size to 6". Bass Pro Shops (36" Cotton Camping The 7/8" standard arbor on the Clear Vue impeller is compatible with the Leeson 5 hp motors I recommend. should be just as powerful. Buying a 3 hp motor made no sense when it cost only $20 more to buy a real 5 hp motor that could handle the load, heat, and startups. In our testing we found a number of cyclones 3 hp and smaller that frankly were running such over sized impellers which cased the motors to run so far above the motor horsepower we had two motors burn up.

3/8X3/4 bolts to mount motor to motor plate, 4 ea. moving at about 50 meters/second, or about 185km/h (115 MPH). I recommend using this impeller with a left handed version of my cyclone design for both optimum airflow and separation efficiency. painted it. The first firm sent me an impeller that exploded due to poor workmanship in their welding and refused to make repair, so I moved on. If my pocketbook said otherwise, I once could have made do by going to my local Harbor Freight (HF) store with my discount coupon and grab on sale their 5 hp compressor motor. Yes! Most commercial shops must change out their fine filters roughly every three months of full time woodworking. That also leaves plenty of room to pass larger pieces of wood without jamming the blower. They were not setup for individual small shop orders. We measure this resistance in what are known as water column inches, meaning how high a blower would have to push or pull a column of water to overcome that resistance. Regardless, I worked out with their corporate headquarters an arrangement to let small shop woodworkers buy these heavier impellers from their local dealers for reduced costs. I was still experimenting with the size and shape of the housing. Lastly, I am aware of the dust collection and PVC concerns..I just don't have them. The increased airflow does a much better job collecting the fine dust and the increased pressure permits you to use all 6" diameter ducting and still move over 1200 CFM to any tool in your shop.