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  1. #1
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    Default Home made cyklone dust collector to Bill Pentz specifications

    Hello from the other side of the world.

    I have built a cyklone to Bill Pentz drawings on a shoestring budget from mostly scrap yard materials. I made it from 2mm plate instead of the intended 0,7mm sheets. I stick welded everything together. I fitted it to a vintage industrial dust blower that should have fairly equal prestanda to the ones suggested by Bill Pentz. A 4kW three phase motor running at 2850 rpm powering a 39,5cm diametre straight bladed material handling impeller.
    Now the frame is welded up and it is time to fit the filters.
    At this point I have reached my level of incompetence so now I hope for your advice:

    I have a 50cm diametre and 100cm high Coral cartridge filter that should be very high quality. It is of the sort intended to replace the filter bag on an ordinary dust collector. It should have very good filtering prestanda and as it has been used for less than two hours for it's intended purpose it should be in good condition.
    Would this filter be large enough for my new dust collector?

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  3. #2
    Join Date
    Aug 2007
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    Saskatoon, SK, Canada.
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    You found the place. Welcome.

    I think it will be a little too small by itself. The filters that come with a Clear Vue Cyclone (licensed version of Bill Pentz's cyclone) have 600 square feet (55.75 square meters) of area. If that filter is close you'd be okay but if, as I suspect, it's too small you will restrict the airflow and risk blowing holes in it.

    Pete

  4. #3
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    Thanks......... 55,75 square metres. Now I have a figure to go by and that makes life a lot easier. I will fetch the filter and calculate it's surface area and find out whether it is comparable.

  5. #4
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    Sadly I found the surface area to be only 8,5 or at the very best 9 square metres........... and the budget is pretty much exhausted with this sole filter costing 700 euros.Now I need 5 more of them........ and now they would cost 900 euros apiece........
    So much for the bloody tool importers who refuse to supply technical specifications.

    Is there any cheaper option?............ around here the only option on the market is cotton filter bags and that's it. I can get more similar Coral filter cartridges from Sweden for 900 euros apiece........ or Logosol branded cartridges with secret surface area and secret filtering capacity..... and that's it.

  6. #5
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    Quote Originally Posted by heimlaga View Post
    .... and now they would cost 900 euros apiece........
    That's a LOT of money for a 9m2 filter cartridge. Do you have a photo or a link for this filter?

  7. #6
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    melbourne australia
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    Quote Originally Posted by heimlaga View Post

    Is there any cheaper option?
    Maybe this company has something suitable? https://www.nordic-air-filtration.co...-filterpatrone

  8. #7
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    USA, Indiana, West Lafayette
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    If it's like the one in their catalog then it's 10 square meter.
    Dave

  9. #8
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    Saskatoon, SK, Canada.
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    Nederman is another company to contact. They make some industrial dust systems that have cartridges and might sell you just the filters. FMC cartridge filter | Nederman

    Found this company with a division in Finland. They have systems that use cartridge filters so might sell some to you and they are in your country to boot. https://wamgroup.fi/fi-FI/WAMFI/home

    Note that most industrial cartridges are designed to filter from the outside to inside so you'll need to make a box to house them with the returning air coming out of the centre of each filter. There are lots of examples in industry you can imitate.

    Pete

  10. #9
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    Thanks Jack and Pete.
    I can surely build whatever fittings or cabinet I need if I only find some affordable filters.
    You have three sources worth researching there and now when looking at them I came to think of a fourth company with a manufacturing plant only 15 kilometres away. I will call them on Monday and see if they have some suitable filter cartridges and if they are willing to sell just the cartridges.
    I don't know why I never came to think of the idea of welding up a large cabinet and using filters that filter from the outside in. That was the reason why I never even thought of the local manufacturer. This may become the key to sucsess!



    Thanks dmorse. That is the catalogue with specifications that I lost before christmas and haven't been able to find. 10 square metres is correct. I was off with my approximate calculation.

  11. #10
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    Quote Originally Posted by QC Inspector View Post
    Note that most industrial cartridges are designed to filter from the outside to inside so you'll need to make a box to house them with the returning air coming out of the centre of each filter.
    I'm not convinced of that. I have two industrial cartridges in series and I'm blowing the dust from the inside without any problems.

    Of course the forum has rotated my photo 90 degrees.

    [FIXED by BobL see post#8 in Uploading Photos ]
    finisheddusty.jpg

  12. #11
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    Heimlaga here is another company for you to look at. EPA Filters | Eagle Filters

    Jack some of the filter makers use layered filter media or the media is treated differently on the dust side to shed the dust better when the compressed air pulse cleaning is used. I can't find the references that I read but I liken it to wearing your pants inside out. You can but that's not the way they were intended. I'm curious if the filters you have have a wire mesh/cage around the inside?

    Pete

  13. #12
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    This is the dust collector so far. Temporarily assembled outdoors without the motor in place. I have already rebuilt and repainted the motor and didn't bother to put it in place for a test assembly.

    The temporary crossbars between the legs of the frame will be removed. They were put in just to limit distortion due to welding stresses.

    The upper part of the cyclone has a large round flange made from 8mm plate. The large flange is clamped to the frame. This enables me to turn the spout in any direction I want depending on how my furture permanent workshop turns out. My present workshop is temporary. The cone of the cyklone has a smaller flange that bolts to the large flange with M8 bolts. This makes the cone removable if something gets stuck and has to be cleaned out.
    The blower also has a housing that can be turned to I can point the spout right or left or forward depending on what fits best.

    The blower was bought secondhand from a local scrapyard and it is built to be mounted on it's own feet and not onto the top of a cyklone. Therefore the solid upper frame to carry it.
    The motor is a 4kW 2850 rpm 380 volt 50 hz three phase Strömberg. Will work well on our present 400 volt. I would guess it was made in the 1970-ies and we had 380 volts back then. It is a very high end motor built to very strict specifications with lots of cast iron in it. I can barely lift it on my own. I tested it with the megger and it turned out to be in excellent condtion. I just put in new bearings and repainted it.

    The frame is made from 60x60x4mm square tubing. I would have used 50x50 but couldn't find enough in the cheap piles at the scrap yard. The frame is in two halves front and back each light enough to be carried by two men. Bolted together with M16 bolts. The cyklone is built from 2mm plate except the lower cone which is just 1,5mm thick. I could not get hold of enough 2mm material at the scrap yard but that was a stroke of luck as the cone would have become impractically heavy if it was thicker. All is stick welded together using the 1960-ies Unitor DC welder seen in one picture.

    The barrel has contained apple juice concentrate. I bought 10 of those barrels so I can bling a trailer loads at a time to an aquintance who burns it in his central heating boiler.

    So...... I may have gone overboard with dimensions but I intend it to last my remaining lifetime. Cylones tend to wear out they say and I want mine to last long. Materials were cheap at the scrap yards.
    Attached Images Attached Images

  14. #13
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    I have just completed a similar cyclone based on Bill Penz plans.
    I am sending the exhaust thru the shed wall into an old dog kennel with no filter at all.
    Ive just finished this so not certain how it will be once I start making serious dust/chips.
    So far using the 3 machines hooked up it shows nothing is getting past the cyclone.
    I will never be making the volume of waste you will be but maybe you could do similar into your yard.
    Ill start a seperate post and put up some pics of mine so as to not derail your post.
    H.
    Jimcracks for the rich and/or wealthy. (aka GKB '88)

  15. #14
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    H. post some picture when you get a chance. Everyone loves them. Oh and check out where Heimlaga lives. That snow free ground is short lived just like here so we don't tend to blow the heat outside if it can be helped.

    Heimlaga I think the beast will last though several generations of woodworkers. Bob can confirm but I believe you can hook up a VFD and speed up your fan to 3460 RPM that our 60 cycle power produces without harm to the motor. You could also slow it down should you want a little less for light dust producers (drill press for example).

    Pete

  16. #15
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    Melbourne
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    Why bother with filters. Cyclone would collect all the dusts and dump them in the bin for ya.
    Filter would restrict the air flow.

    The only time I see some dusts on the outlet was when I let the bin overfill.

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