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  1. #16
    Senior User
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    stu
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    Re: HF now in Cary

    This is basically the system I'm going to build:

    https://www.youtube.com/watch?v=8v5079FPCsY

    I won't use the XL model though, just the regular Super DD. I plan on using 5" HVAC ducting for the mains.

  2. #17
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    stu
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    Re: HF now in Cary

    Quote Originally Posted by MarkE View Post
    I also have a set of jaw pullers that you are welcome to borrow. 3", 4", 6" and 8"
    Thank you Mark, I'm in Fuquay, so if I can't find a set from AutoZone, I'll give you a buzz.

  3. #18
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    DQ

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    HenryW
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    Re: HF now in Cary

    Quote Originally Posted by photostu View Post
    This is basically the system I'm going to build:

    https://www.youtube.com/watch?v=8v5079FPCsY

    I won't use the XL model though, just the regular Super DD. I plan on using 5" HVAC ducting for the mains.
    Hey Stu, please takes notes on what you do here. I have that HF model and a larger model of Oneida's cyclone. So far the performance is underwhelming, but I see a few reasons why when I compare to the video. The impeller change is interesting idea. Do keep us up to date.
    Henry W
    Prolific creator of sawdust, and sometimes shavings - with the occasional completed project.

  4. #19
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    Sean
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    Re: HF now in Cary

    Quote Originally Posted by gmakra View Post
    Attachment 29136

    You need one of these its called a fan hub puller.
    You can try a 3 jaw but chances are you will be sorry when the impeller breaks and the hub is on the shaft.
    And reports of doubling air flow are suspect if you study fans you will find a little thing known as the fan laws which say something to the effect of that amps go way up on modest increases in flow.
    I use the fan laws nearly daily. They are meant for geometrically similar fans. Because these are significantly different profiles, it doesn't apply here. If it did, you'd see about a 70% increase in flow, but 2.5x the power draw.

    What is likely happening is a combo of a big change in fan efficiency coupled with not stellar measurement techniques.

  5. #20
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    George
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    Re: HF now in Cary

    Sean point taken, however even if the new impeller is more efficient there is still a tax on power draw.

  6. #21
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    stu
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    Re: HF now in Cary

    Some conversion threads I have seen about this denote a higher amperage draw. I'm on a 20A circuit already, not worried about moar power.

    This was the only measurement I needed to see to convince me it was worth it:

    https://youtu.be/8v5079FPCsY?t=86

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