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Thread: 2hp DE Build

  1. #46
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    More progress today. Blower is now mounted on top and it's not a tippy as I thought it would be. Nice and stable.
    I'd appreciate some input on how to connect the rectangular blower outlet to the filter cartridge.
    Options I'm considering:
    1. make a rectangular cross-section 90* bend from MDF and metal/polycarbonate sheet, or
    2. make a rectangle-to-round transition and use 6" PVC ducting with a PVC elbow.
    Thoughts?
    Attached Images Attached Images

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  3. #47
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    I made up an inner template with rounded top edges and an outer template then used a heat gun to soften the 6" PVC pipe. I pushed the outer template over the pipe with the other template in the centre. It took a number of heatings but it worked out great.
    BTW. I used the pipe end with the larger joining diam.

    IMG_0521.jpg

  4. #48
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    Thanks Lappa. Any chance of a pic of it installed?

  5. #49
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    I installed mine on the outlet of my modified 2HP DE. I had to fasten the pipe to a wooden "collar" which was then fastened to the DE outlet with nuts and bolts.

    IMG_0588.jpg


    The fitting at the top that connected the 6" flexi to the dust extractor 4" inlet is now a 6" inlet into the dust extractor body

    IMG_0604.jpg

  6. #50
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    Thanks heaps. Looks great. The OD of 6" PVC is 160mm, so I assume that's 160mm flexi?

  7. #51
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    Yes. Its 160mm semi Flexi.

  8. #52
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    Something else to consider is using a bell mouth hood entry to the impeller like this.
    Upgrading a 3HP Single Phase DC with 4HP 3P motor and VFD

  9. #53
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    Did the bell mouth inlet improve the performance Bob? I had a quick read of the thread you linked, but I didn't see any before and after airflow measurements. Did you do any tests to verify if the bell mouth helped?

  10. #54
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    Quote Originally Posted by jack620 View Post
    Did the bell mouth inlet improve the performance Bob? I had a quick read of the thread you linked, but I didn't see any before and after airflow measurements. Did you do any tests to verify if the bell mouth helped?
    Not much, ~4% at 50 Hz. I was more interested in what that mod could do @60Hz (greater turbulence at this speed but didn’t feel like refitting the old flange to perform the comparative test.
    OTOH every little bit helps.

  11. #55
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    Quote Originally Posted by jack620 View Post
    .......... how to connect the rectangular blower outlet to the filter cartridge.
    Options I'm considering:
    1. make a rectangular cross-section 90* bend from MDF and metal/polycarbonate sheet, or...........

    Option 1 is the way Clear Vue do it on their Cyclones. You have the option of making it any length you need and you can pick the best radius if you have room. Per the "Cookbook" on page 56 a square radius duct of 2R has the same drag equivalent of 17' of straight duct as a 1.5+R round duct shown on page 54. Now a single elbow to the filter doesn't seem like it would have a big impact on flow but it is going to be 2X better than using a transition and a flex hose 90º. Like Bob said "OTOH every little bit helps".

    If you make that bend with a clear plastic you might be able to watch the inside of the filter to see how long it takes the dust cake to build up and it will certainly let you see when the collection bin has overfilled.

    Pete

  12. #56
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    Quote Originally Posted by QC Inspector View Post
    Option 1 is the way Clear Vue do it on their Cyclones.
    Thanks for the link. That's what I had in mind. Customisable, as you say.

    Quote Originally Posted by QC Inspector View Post
    Now a single elbow to the filter doesn't seem like it would have a big impact on flow but it is going to be 2X better than using a transition and a flex hose 90º.
    I wasn't planning to use flex because H&F only sell it in 3m lengths of 150mm (which wont fit over 150mm PVC) and 160mm Speedlock is well over $50/m plus $18 postage. For that reason I was going to use a standard PVC elbow. However I'm warming to the idea of a Clearvue style bend.

  13. #57
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    Quote Originally Posted by jack620 View Post
    Thanks for the link. That's what I had in mind. Customisable, as you say.
    I wasn't planning to use flex because H&F only sell it in 3m lengths of 150mm (which wont fit over 150mm PVC) and 160mm Speedlock is well over $50/m plus $18 postage. For that reason I was going to use a standard PVC elbow. However I'm warming to the idea of a Clearvue style bend.
    This might be of interest.
    Mens Shed Dust Collection

  14. #58
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    That looks great Bob. I have a small sheet of 3mm thick PC I hope to use for the curves. I may have to heat it to get it to bend that tight. I was planning to route 5mm deep grooves and epoxy the PC into them. That would remove the need for the all-thread.

    Like this:
    Attached Images Attached Images

  15. #59
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    Quote Originally Posted by jack620 View Post
    That looks great Bob. I have a small sheet of 3mm thick PC I hope to use for the curves. I may have to heat it to get it to bend that tight. I was planning to route 5mm deep grooves and epoxy the PC into them. That would remove the need for the all-thread.
    Like this:
    I also thought about epoxy but just about everything I make mechanically is designed around being able to be pulled apart and this drifts into simple things like this short bit of ducting

    3mm PC seems like a bit much and I would maybe save something that thick for use where its impact strength would be more usefully employed.

  16. #60
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    The Clearview looks like a 90o going from rectangular to rectangular. I though you wanted to go from rectangular to round?

    BTW - The 90o with flex I used makes two fifths of five eights of very little difference to the flow.

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