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. I was still experimenting with the size and shape of the housing. It will not move enough air with a single 4" port. 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. Otherwise we would be forced to wheel our dust collector or cyclone right next to each tool. Acquire required parts. In a previous e-mail, you warned about the attachment method used by CF, which is, to say the least, problematic. did, it's too light to cause serious injury. The American Society of Heating, Refrigeration, and Air-conditioning Engineers (ASHRAE) is considered the world authority on filter measurement and performance. Tetap menggunakan triplek dan plastik. | My attorney said I could be held liable and it was not a good idea for me to recommend anything except suggesting you follow the vendor instructions, adhere to your local codes, and work safely. water, and the motor's power consumption dropped to 218 watts. I had this blower for my kids jump house. Over the years I had improved my impeller designs and had four really good options both left and right hand rotating 15" impellers and 16" impellers. With these corner registration marks you can print a full sized layout including the spiral that many find difficult to draw. To use one of these fan tables we need to know three things, required minimum air volume, maximum resistance and minimum resistance. 1/4X2 fender washers for motor plate bolts, 6 ea. 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. This vendor correctly shares that because of their light weight aluminum alloy impellers come up to speed faster with a smaller starting load on our blower motors. This floor drain from Menards looked a perfect fit. and it was! Electric Motor Warehouse provides discounted motors with the right face frame mounting. Farr Part# 211736-1 HemiPleat filters, for $215.00 each (Specs:~ 300sq feet surface area, about 13" diameter by 34" long, 99.4% efficiency at 0.5 microns, and 1000 CFM at 0.5" SP). I strongly recommend against running them backward! If started too often that heat builds too fast and the motor will burn up. My goal was to use 2" PVC from the outside blower into the Dust Deputy inside. Wet a finger and see how far you can move it from your lips and still feel blown air. After lots of testing I found the Jet 14" impellers max out at around 875 CFM for almost all shops, so I instead recommend you use a Clear Vue 15" or 16" diameter impeller that will give you more than the full 1000 CFM we need for good fine dust collection. Please don't chase them away from helping us by burying them with questions and special orders. Anyhow, in terms of resistance most small shop fine filters start out brand new with only about 0.5" of resistance then as they season their resistance will climb to 2.5" to 3" just after cleaning. a cheaper blower setup. cleaner yang saya pakai. Running a backward curved impeller the wrong way works getting better high-end performance of about 100 CFM and one more inch of pressure in trade for using more power and making lots more noise. The two pictured motors show the difference between a face frame mount and normal mount. free to move about the room as needed. I started to wonder if the 1/3 HP rating of my tile saw motor was perhaps That meant we need two of the Farr filters or three of the Donaldson-Torit. Each of the major vendors provide fan tables that show how much hp each of their impellers draw at different resistance levels. I experimented with obstructing some of the flow at the inlet If your airflow in the cyclone does not match the direction the impeller turns then your motor must do more work to reverse that spin and you lose considerable performance. Filter Types There are two major classes of filters, all polyester and polyester fiber blended filters. Pengunci dudukan motor saya hanya memotong triplek berbentuk oval dan dilubangi untuk baut. motor/fan unit shown earlier, the motor's power consumption drops in half when I made this dust collector with parts I had on hand. I can't stand the volume our vacuum, so I've given up. I block the air inlet. I can certainly sleep much better, confident that the impeller will not slip off the motor shaft. keep it from overheating. I decided to build my own blower, based on the information on your site, using the Leeson motor and a Cincinnati Fan impeller. 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. Filter Sizing Filter sizing is done by looking at airflow and filter loading. The inlet goes centered right over the impeller. a very efficient portable unit built light. When challenged with all going right through the blower which happens with a plugged cyclone, full dust bin, bad air leak, or big surge of dust, these impellers were damaged with a few even exploded. The other possible problem was my impeller design. "For many years aluminum alloy impellers have been specified to minimize sparking if the impeller were to contact other steel parts. This particular page steps you through the process I used to build a blower. I used to just send people to the Leeson, Baldor or other appropriate motor wiring page, but most had trouble finding and applying the specific information. I told Barry I like Baldor motors because my earlier projects used Baldor motors extensively. When we have a vertical shaft, then the weight of the impeller is constantly trying to slide the impeller off the motor shaft. They also warn that these impellers are not to be used on a vertical motor shaft because set screws cannot carry the weight of the impeller. This 4" to 12" average pressure range coupled with the 800 to 1000 CFM is what requires us to use pressure blowers for dust collection. 3/8 lock washers for motor mount bolts, 1 ea. Unlike a fan, dust collection equipment uses very large heavy impellers with lots of air resistance that cause very high starting loads. I used it to vacuum up loose dust from my table saw pretty effectively. I saw one motor that was ruined and burned up from such a jam. too constrictive to use with this type of low pressure high volume Next look at that same table and see what happens to the horsepower demand when the resistance is at a minimum meaning only 4" with that 14" diameter impeller. My 18" standard cyclone plans work with these 14" sized impellers, but are best with the 15" and 16" impellers I designed. Our having to breathe the finest invisible dust known to cause serious health problems for a few years while waiting for our filters to fully season is why I strongly dislike most small shop vendors advertizing "seasoned" filtering levels. 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. Using no overlap creates a huge blower. I came up with a fairly simple solution that I decided to share with you. This is called seasoning. Even these heavy duty motors come with a caution to not start them more than about 6 times an hour. straight bladed impeller. This larger impeller best uses the available hp and maximizes airflow. At first I was not sure on my wiring, so started with the impeller turning the wrong way. I thought a bit about what would happen if one of these blades came off I mounted this impeller on the motor shaft using the Your email address will not be published. Remember, most of the cfm ratings on blowers are rated as is blocked. At 12" resistance this 14" impeller moves so little air with such an unsteady flow that it does not even have a value in this table and will not even move enough air to provide the needed 350 CFM needed for good "chip collection". The total cost was about $15. To attach this impeller to your motor shaft you need a custom arbor. The startup load is so high that it takes at least ten minutes of running to get rid of the extra heat. Once a layer of One effect of the sanding on the impeller is that a thicker shim is required between the bushing and impeller. Once it balanced level on the marble, the vibration problems Building | A couple of decades of testing and experience have verified we need at our larger stationary tools that have upgraded hoods about 800 CFM to create a minimum "bubble" ample to meet OSHA air quality standards, roughly 900 CFM to meet ACGIH recommended air quality, and about 1000 CFM to meet medical and EPA recommendations. 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. 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. So if we go to the steel pressure blower fan table shared by Cincinnati Fan we see by looking down the 12" pressure column the first blower that will move at least our needed 1000 CFM is SPB15 blower housing with a 15.5" diameter impeller that has 3.5" tall blades. an air speed of 46 meters per second (167 km/h or 104 MPH). Additionally, they also use these meters to show when it is time to change out their filters. Regardless, these Leeson motors are real 5 hp motors, not the inflated hp motors used on some vacuums and inexpensive air compressors. The air should flow first onto the surface coated with this release agent which for most means from the outside into the cylinder center then out through an end. tight bag in the camping section. If you do so, then you need to also inset your fender washers so they hold the blower on tight. FishCarver.com. best. Sliding the block back and forth, it seemed like pitot tube pressure Electric Motor Warehouse as a favor to hobbyists prices this below what other dealers must pay in quantity 100. Anyway, end of rant. Okay, so you made an exotic airfoil powered cyclone that leaves a chromed trailer hitch bald. There was little left of my blower and I was amazed that the heavy PETG plastic used in Clear Vue Cyclones actually held up far better than the 18-gauge steel. Carefully build the blower housing and solder the connectors. The air tables and lots of testing show at a minimum the smallest impeller that you can use to power a cyclone and get a real 1000 CFM airflow over the resistance levels found in most shops requires a 15" diameter impeller. ini berhasil menyedot debu namun kurang kuat dibanding dengan vacuum to turn a drum full of wet clothes , so you shouldn't have a problem there. A vacuum cleaner or shop vac won't consume much less power, when the air DIYDIY dust collectordust collectorhomemade dust collectorwoodworking, Terimakasih btw yakin kah itu dinamonya 14.000 rpm mas?? This whole section was redone thanks to some tips from a couple of friends who are blower experts. If you use an amp meter, you can partially close and lock a blast gate in place to ensure your maximum air movements do not over amp your motor. By that I mean waving a bigger paddle with the bottom closed quickly reaches a point of no return if air cannot get to that extra surface area. OnceIhadagood sense for what size impeller and enclosure I needed, For dust collection we use material handling impellers. 3 self tapping screws. used blower/motor combination, the rest is easy. 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. The outlet width needs to be equal or bigger than whatever limits the blower input and must also be big enough to provide the clearance we need on our spiral. inspired me to experiment with building a siren. It made quite a howl while doing this, and that later as a function of air speed as measured by pitot tube pressure. Air engineers long ago learned we must capture the fine airborne dust as it is made. So I used a 1/3 HP 3500 RPM motor from a tile saw that I picked out of a dumpster. it would cost to buy a 1/3 HP motor alone. find a used dryer blower. To be able to use much more readily available 6" diameter ducting I used a 15" diameter impeller and 15" blower housing to amply increase pressure to get the needed flows. Because blower technology is mature, blowers of the same type and size provide near identical performance regardless of which commercial vendor we use. Most only have one or two tiny set screws holding the impeller in place, so many have reported that their impellers slid down and did bad things to their blower housings. use a screen. Conversely, we can only feel the sucked air out to a couple of inches. I'm not concerned about a bag to collect the 1-2% missed by the cyclone since it will be mounted outside. Woodworking makes so much dust we really need a lot of filter area to minimize the back pressure on your blower and to reduce how often we need to clean the filters. Bill, please help. They have 6" as well. mover. Dalam percobaan fine. That lets me use a 9" diameter opening for my 18" diameter cyclones and a 10" diameter inlet for my 20" diameter cyclones. air speed squared as well. The pitot tube read a pressure of 132 mm of water. Di bagian lubang yang tengah saya tutup dengan kasa agar jika ada paku yang tidak sengaja tersedot tidak masuk ke dalam blowernya. again by gluing pieces of wood onto them. same air just round and round. It may An undersized impeller just spins leaving a good portion of your motor's horsepower unused. These used to be only 3 hp motors, but HF had so many returned they for a short time sold real 5 hp compressor duty motors. You need to have both the top and bottom of the impeller surfaced flat with reference to the hole. The recess also holds the gasket seal (just a piece of stick on foam insulating tape). Regards, Gary French Unless both the top and bottom of the impeller are made flat, tightening the hold down bolt could force the impeller to "wobble" causing a dynamic imbalance. He is a very busy fellow and making arbors is not his priority, but he also likes to help others out. or just using pitot tube pressure as the flow rate. 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. Epoxy the 3" length of PVC pipe into the hole with one end flush with the work We normally calculate the worst case ducting situation in our shops to allow us to later move any tool to any location. Cut a piece of wood to This same page also give details on how to mount your cyclone inexpensively. Wikipedia, and made a pressure to air speed conversion table: To get our minimum 1000 CFM airflow I over size the blower wheel to move up to a real 1200 CFM, so at a minimum we need 300 square feet of filter area. At 31 cm diameter, that calculation came out to 200 mm of water. I hope this is useful to you. Sadly, all of those kinds of posts rapidly vanished from the major Internet woodworking forums whose livelihood depends upon vendor advertizing. Cutting into each corner and bending the top and bottom at ninety degrees provides plenty of attachment area for a good tight seal. Build your silent dust 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. I again subsidized the costs for test gear, testing, blower housing, and provided the engineering specifications. Their main concern is when the inevitable heavy block, knot, tool, nail, screw or other item gets sucked up and goes through the impeller these aluminum alloy impellers can explode. The only machine work that is required is to drill and tap a 3/8-16UNC hole in the end of the motor shaft, which I was able to do (carefully!) Digunakan untuk memutar impeller. I shortened the blades, made a circular housing for the impeller, The bottom line here is I have a really difficult time as an engineer wanting anything less than a 15" diameter impeller and good solid 5 hp motor for the heaviest used motor in my shop. Motor yang saya gunakan adalah motor bekas mesin cuci. The marble was just large enough not to fit through the 5/8" Generally when asked this question, if you have a 3 hp dust collector then I recommend using it vented outside. A 7" main often drops this to only 5 water column inches. But that same table tells me at that big of an opening, my horsepower will go way over for my budget motor that only has a real 3 hp. There are some fan charts on the Cincinnati Fan site that might help you compute the performance, plus I have seen some with my searches through Google. Copyright 2000-2022, by William F. Pentz. based on a part that I had no idea how to obtain if I needed another one. Then rout the holes blower top hole big enough so the impeller will side through. In fact, if we know the amount we want that to decrease in one turn, we know that the circumference of the center. A small, tightly woven material as a bag attached to the I think the idea is as the air moves radially outward, the backward curved blades For our indoor dust collector and cyclones where noise is a serious consideration, we also want a backward curved (BC) impeller blade to minimize noise problems. What we found with our testing is only those three vendors had performance that matched industry norms and all others were below, some very badly. I strongly recommend use of steel backward curved material handling impellers. I hope you realized that clicking on that picture gives you a full sized picture.
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