With the inlet unobstructed (no filter or separator), the motor 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. and finally, by gluing a small block of wood to the side that was too Commercial dust bags used on shop style dust collectors are wasp sucker or here. |
to work over. Calculating the maximum resistance is a little more difficult. Think of it as a garbage disposal in your lap. Filter Sourcing At first only Camil-Farr offered a standard 300 square foot commercial woodworking 0.5-micron cartridge air filter. Many including me learned the hard way that set screw mounted impellers slip down the motor shaft and destroy the blower housings. I compared the winding resistance to that of the blower 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. These have the advantage of fitting in the existing 15" blower housings with only tiny modifications to the hole that lets the blower housing slip over the mounted motor and impeller. 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. But I was getting a lot of shaking. 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. I hope you realized that clicking on that picture gives you a full sized picture. the outside flange on the blower fit perfect in the drain. This vendor uses undersized motors with high service factors meaning they can run at 125% of maximum power. The worst was that highly rated aluminum impeller cyclone that used a circle shaped blower with an impeller that had the support castings for the blades in the middle of the airflow. In a previous e-mail, you warned about the attachment method used by CF, which is, to say the least, problematic. Most compressor, pump, and farm duty motors will handle these high startup loads and up to the six starts an hour. Motor yang saya gunakan adalah motor bekas mesin cuci. My 18" standard cyclone plans work with these 14" sized impellers, but are best with the 15" and 16" impellers I designed. So I glued on the second layer of my impeller. Vendors simply used way over sized impellers and then choked them down in real use with undersized ducting to save their motors. 3/8 nylock nuts for carriage bolts, 13 ea. ID. A horizontal motor shaft carries the impeller weight. The blower is designed so that the front panel is part of the 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. 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. 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. I had this blower for my kids jump house. In a cyclone this 5 hp motor actually was left with over 1 hp of unused capacity, so I engineered a 16" impeller. For both my large dust collector, as well as that 1/3 HP too constrictive to use with this type of low pressure high volume It also sizes our main at 6", 7" or 8" and it also sizes our minimum down drop size to 6". on a block of wood. http://rover.ebay.com/rover/1/711-53200-19255-0/1?icep_ff3=2&pub=5575168271&toolid=10001&campid=5337860386&customid=Electric+Motor&icep_item=400342556275&ipn=psmain&icep_vectorid=229466&kwid=902099&mtid=824&kw=lg. That lets me use a 9" diameter opening for my 18" diameter cyclones and a 10" diameter inlet for my 20" diameter cyclones. Slid the duct Then carefully spin that shaft with a hand drill to quickly take down the aluminum impeller alloy to have nice flat faces both top and bottom. Your email address will not be published. Operation In fact you will be lucky to get 785 CFM when pulling through a 6" duct and barely 349 CFM when pulling through a 4" duct. With too many unable to build their own arbors, I had a machine shop make up arbors and sold them at cost. Agar bisa dipasang di motor, saya pesan adaptor ke tukang bubut. I prefer a loose weave material for a dust bag. I have not hit the ground so quickly since in the Vietnam War. 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.
well. As our filters age, they build up dust trapped in the filter pores that does not come out with normal cleaning. They offer the Leeson Model # P145K34DB1B, 3450 rpm, 5 hp, 7/8" shaft, 20.8 rated amp motor with the added face frame mount: Leeson Motor Part #120554.00 part #175181. You can easily test this. It is a virtual printer that sits between your application and your printer. filter box. Covering the hole let If you build a powerful high-speed blower incorrectly it could cause serious injury or damage. 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. Building | Although most do not need the larger 15" or 16" impellers if they use the all 7" diameter ducting and port sizes I recommend, you really should use a 15" or 16" diameter impeller if you use 6" duct. Here are his 14" blower plans for standard 8.5 x 11" paper, legal sized paper and 14" version for 13" wide carriage printer. large enough to accept a 3" long piece of PVC pipe the same size OD as your duct hose The result is their motors draw more than the maximum motor rating when collecting from the closest machine with the least amount of duct, particularly when venting outside without filters or when filters are new. Dicks Sporting Goods (36" Cotton My goal was to use 2" PVC from the outside blower into the Dust Deputy inside. Placing a scrap of plywood over the impeller helped it run faster. Most carvers tend to work He is a very busy fellow and making arbors is not his priority, but he also likes to help others out. Additionally, we also must surround the working area of each tool with a "bubble" of air moving at least 50 FPM to overcome normal room air currents. Note the ends of the blade tips point away from the direction of rotation. Can I use the same 14" impeller that others use and get ample performance? To size our blower motor we simply look at this same impeller at our minimum resistance level. Now look at that same table at what happens during the vendor supplied tests that instead use the 8" opening and main that the more popular cyclones use and recommend. Barry explained that dust collection motors tend to be the heaviest we use in our shops so he recommends buying the best quality possible. by sliding a block of wood over where the air gets pulled into the filter box. The 16" moves the same air volumes and pulls the same horsepower in these conditions. new one easy enough. This in the most open air configuration which is what they use for advertising, lets them claim far over 1000 CFM airflows.
such can be treated as a linear system as long as one uses air speed squared, 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. Unlike a fan, dust collection equipment uses very large heavy impellers with lots of air resistance that cause very high starting loads. "Airborne microparticle recuction filter". With these corner registration marks you can print a full sized layout including the spiral that many find difficult to draw. An undersized impeller just spins leaving a good portion of your motor's horsepower unused. Although that can generate higher end CFM and pressure, it is not a good thing to do. Almost all small shop vendors error by supplying their larger cyclones with only 14" diameter impellers and only 2 or 3 hp motors. The Cincinnati Fan pressure blower table shows we need at least a 14" diameter BC impeller turning at 3450 RPM. This is still not recommended. What affordable blower recommendation do you have for our average and larger sized shops? The 15" diameter works well, or you can upgrade to a 16" for even more airflow and better use the capacity of a full 5 hp motor. the bag. on a shop vac is a bad idea - the airflow through the motor is needed to Separated the pieces and bolted the template centered on the top. I'm guessing that the air around the impeller also spinning increases 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.
Before we can use our fan table we also need to know the highest and lowest resistance levels in our shop. 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. Or keep an eye open on trash day in your Carefully build the blower housing and solder the connectors. use a screen. Remember that the airflow inside the cyclone spins in the same direction going down as it does when it comes back up and exits the cyclone into the blower. 3 self tapping screws. 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. Untuk lubang intake saya menggunakan pipa 4 inci karena saya punya itu, mungkin kalau berhasil akan saya rubah dengan yang lebih kecil. Download | That seal is critical in terms of controlling the really fine dust. 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. I ran the self tapping screws in to ream the holes. Digunakan untuk memutar impeller. These impellers are designed for mounting on horizontal motor shafts. Camping Gear Bags) A few have made their own impellers but you need to know that the forces involved with a 14", 15" or 16" impeller turning at 3450 RPM are measured in the tons. Letting the dust build any higher kills the airflow needed for good collection. A call Most motors require careful installation to ensure ample airflow to keep from overheating. Make up an emery cloth on a fender washer to serve as a hone, perhaps with a little lapping paste. 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. The other possible problem was my impeller design. For my blowers I like to cut the housings out and round over with a 1/4" bit to make a little nicer presentation. (adsbygoogle = window.adsbygoogle || []).push({}); I made a six-bladed impeller out of some pieces of pine and some 1/4" So many believe that nonsense that my choices are to either respond here or have to deal with far too many emails addressing the serious issues with aluminum impellers that leave me only recommending heavy steel impellers. Which ever way works best for you, It was too small for the 16" impellers, so I engineered a special 15.5" impeller that my machinist, Inchs Machinery in Loomis, CA (916) 652-0628 built and sold directly. Clear Vue had me engineer their CV-Max with modified inlet and outlet to move a little more air with these 16" blowers and still fit under an 8' ceiling. Others tell me they have been able to order the Donaldson-Torit filters from www.buy-filter.com. Likewise you can go to Mark Goodall's excellent Motor Wiring Page to learn more about motor wiring. Instead of string, I used fiberglass reinforced packing tape as my band plus the roll to make it easier to make a better line when unwinding the tape. I looked up pitot Tube on how well it destroys what it eats, I still haven't got over the "hummingbird pake sealent bang buat nutup celah udara nya. Star Washer
My first impeller If started too often that heat builds too fast and the motor will burn up. That arbor hub is too large for the 5/8" shaft on the less expensive Harbor Freight motors that I do not recommend. free wheeling no restriction so don't be fooled by the rating. This lets the blower housing and cyclone get removed without having to take down the heavy motor and impeller assembly. Did you make this project? The size of this bubble is defined by what level of fine dust collection we want. 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. Most commercial shops must change out their fine filters roughly every three months of full time woodworking. based on a part that I had no idea how to obtain if I needed another one. Putting on my shop apron and envisioning a picture of what I want to build. Running the blower without cyclone or ducting will move far more air than the motor has horsepower to support, so will quickly burn out the motor. saya juga kurang yakin, di stikernya tertulis 350 / 14000 rpm. 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. The blower wheel will shred anything that falls They have 6" as well. When mounted on a vertical shaft the commercial blower makers strongly recommend using a tapered shafted motor with a bolt which screws into the motor shaft to lock in the impeller or use a compression arbor similar to what we use in our routers to hold bits securely when mounting impellers on a vertical shaft. the bag through the inlet at a rate in which the air can leave the fabric of not fit through a 5/8" hole. more air than another with a 750 cfm blower with a 2 foot long bag, also 2 The plywood prevented "fresh air" from getting pulled in from Does the groove for the metal motor mounting plate go on top or the bottom of the upper piece of plywood? A fan table will tell us the required impeller size, motor size, and ducting size if we know the static pressure and required airflow. How does the blower stand up to the work? a cheaper blower setup. Di bagian lubang yang tengah saya tutup dengan kasa agar jika ada paku yang tidak sengaja tersedot tidak masuk ke dalam blowernya. The red impeller is a Jet and turns CCW when looking at the vanes. the blower some more until after I built the rest of the unit and This vendor makes an indoor cyclone that is not certified as either fire or explosion proof. So I set out to try to build a small dust collector to be Flanged Bronze Bushing #7815K52
like this out there. This same page also give details on how to mount your cyclone inexpensively. I strongly recommend use of steel backward curved material handling impellers. the effective size of the disk of air, hence the difference. To cover a large area with sucked air we have to move a large volume. Kindle Unlimited Membership Plans
From the ACGIH's Industrial Ventilation: A Manual of Recommended Practice for Design, page 7-22, 26th Edition, 2007:
The other problem is of course that doing so can setup vibrations that could destroy the motor early and with plastic and aluminum impellers, could result in impeller failure. 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. keep it from overheating. Because blower technology is mature, blowers of the same type and size provide near identical performance regardless of which commercial vendor we use. Figuring out the outlet height is easy because it is the same height as the blower height. I do not recommend use of aluminum or plastic impellers in either dust collectors or cyclones because they can self destruct! |
I found an old gauge that was right on and used it for my center. 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. History | Most blower cases have a flange in which to
Cut a piece of wood large enough to cover your lap. I didn't have enough power to spin the Plugging it in, I found that the motor was only turning a few hundred RPM. I saw one motor that was ruined and burned up from such a jam. That poses a problem as most filters are not coated on the inside. fine. came handy with my next blower design experiments, Blower pressure Router a channel around the adapter to Caution - do not install the impeller until you have tested the motor for turning in the correct direction. But in general, for turbulent air flow, air resistance is a function of As a result, we have to collect the fine dust as it is made. put the O-ring over the bag end on the adapter. flexible duct hose to the blower inlet. He said these imported Baldor motors provide poor quality and they fail often. and neglected to take more pictures. Conversely, we can only feel the sucked air out to a couple of inches. Take a few minutes, study your impeller and figure out which way it should rotate. mover. I had shortened it further, but then I now have a few impellers custom made with the compression arbors, or you can buy a commercial blower and impeller. The result is my motor plate fits flush on top and is held in place with the big fender washers. My lung problems required me to get the best filters I could find, so I went with the Donaldson-Torit 0.2-micron compatible cartridges. Still, if you were to ask how well this will work I would make an educated guess: I would bet the performance would be similar to that of a 12" impeller, probably a little too small for good "chip collection" in a 2-car or larger sized shop, or a shop with any larger professional grade tools (see the CFM requirements table on the DC Basics page). with a hand drill, a regular tap, and a bottom tap. For a 14" diameter impeller this comes out as a 1.4" clearance between the impeller and the bend in the blower housing known as the "gore point". medium weight material bag.
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. Bolt the template upside down to do the same on the bottom. A motor with a 0.5 service factor should never be run more than half time or it will overheat and can burn up.
purpose. from their lap instead of a bench top like most dust collectors are designed for. I mounted this impeller on the motor shaft using the
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. that cause lots of internal turbulence and disrupts flow. Now he recommends the American made Leeson motors. Without mincing any words one fellow electrified his cyclone, another melted the end off a screwdriver and a third tried to burn his house down. I thought a bit about what would happen if one of these blades came off Can I use this same good quality motor that has exactly the same mounting face as the Leeson you recommend to power a 14" jet impeller? Anyhow, the blade height does make a difference but not nearly as much as in the case with a fluid. Amazon Daily Deals
Because the ducting sets the maximum airflow, I can size the blower inlet to the cyclone outlet. 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. 1/4X2 fender washers for motor plate bolts, 6 ea. 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. Costs now are about double that after a huge increase in the price of steel and much higher shipping costs. Since bench top space is at a premium in most carving rooms this lap model works As our filters age, they wear out meaning the pores get larger and larger until they no longer trap the finer particles. The result is you get some additional pressure and a little more volume but not a huge amount. This is one of those areas where I provide far more information than many want or need to know, so the bottom line is if you use the Leeson 5 hp motor I recommend you use a 16" diameter impeller to get the maximum airflow and pressure from your motor. draws 415 watts. Carving Videos Barry owns Electric Motor Warehouse and he has decades of motor experience. inlet will be. This 15" impeller and blower design with 5 hp motor became my standard in 2004 and the standard used by Clear Vue Cyclones. or just using pitot tube pressure as the flow rate. I decided to build my own blower, based on the information on your site, using the Leeson motor and a Cincinnati Fan impeller. foot wide. I told Barry I like Baldor motors because my earlier projects used Baldor motors extensively. curve away from the direction of rotation. Further discussion with Gary indicated the impeller casting is not perfectly flat on the front and back, so there is uneven contact. 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. Most with larger needs use 5, 7.5, 10 and 15 horsepower three phase motors. In other words, if you sucked up a rusty nail it could knock off a small piece of aluminum creating the equivalent of throwing part of a lit sparkler into either your dust bin or filter. We need to make the curve as a true rather than approximated spiral. Gear Bags) We have one company here locally that leaves the old from a dryer blower / motor, cotton bag, vent hose and some scrap plywood. Add that to mounting this motor in the hottest place in our shops and 3 hp motors will eventually burn up.
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. My son would only make one cyclone design, a single left handed 18" diameter cyclone optimized for both airflow and separation. Many browsers automatically rescale the picture to fit on a single screen. Next again use the circle-cutting jig to route a bottom blower piece hole to match the outlet from the cyclone. If you order this one, be sure to ask for having the face frame mounted for you and setup for CCW rotation. Worse, if you look up the current warnings you will find that the experts on ventilation recommend against use of aluminum impellers. 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. New Blowers- Although in drafting class they teach an easy way to make a spiral using a compass with four different radius settings, this is a bad technique because it changes the airflow four times creating pressure waves that hurt performance and add more noise. It will not move enough air with a single 4" port. I have already had one welded impeller I was testing fly apart from those turning forces. 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. A small, tightly woven material as a bag attached to the Alternatively, a 1.10 service factor motor can run at 110% of its maximum rated horsepower without overheating as long as it is not used in an already hot environment. I used a bit of calculus to work out the theoretical pressure find a used dryer blower. Now sliding the filter in place. The reason for putting that groove on top, is you can take down the blower shroud and cyclone without having to remove the motor and blower. This added airflow and pressure are important. The blower table shows this impeller will move a real 1022 CFM at 12" and draws a real 3.44 hp. Updated: May 10, 2016. secure a dust bag with a large rubber O-ring. I tried the impeller, as shown, but the centrifugal force caused the plywood backer These low service factor motors are often used for fixed purposes such as opening a gate and have heat sensors that limit how much they can run.
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