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Thread: Too much vacuum

  1. #1
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    Default Too much vacuum

    I have connected the shop vac to the RO sander and solved the issue I had with the cyclone. It works brilliantly.
    In fact it is so effective that the sander sticks to the wood. I am going to have to create a hole somehow so that some air can always enter the cyclone.
    Has anyone else had the same problem?
    What size hole is best?

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  3. #2
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    That is why some vacs (such as Festool and Fein) have variable suction.

    Regards from Perth

    Derek
    Visit www.inthewoodshop.com for tutorials on constructing handtools, handtool reviews, and my trials and tribulations with furniture builds.

  4. #3
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    You could put a coverable hole in the hose, the same as the houses vacuum near your thumb.

  5. #4
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    The Bosch GEX 125-150 has a bleed hole which is covered when the cartridge filter is fitted and uncovered when the vacuum attachment is fitted.
    As Woodpixel says you can make a bleed hole. Fit a short length of pvc pipe with a hole in the Vac, hose. You could split another piece of pvc, place it over the hole in the pipe and use it to create a variable bleed hole if you wanted.

  6. #5
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    Quote Originally Posted by Lappa View Post
    The Bosch GEX 125-150 has a bleed hole which is covered when the cartridge filter is fitted and uncovered when the vacuum attachment is fitted.
    As Woodpixel says you can make a bleed hole. Fit a short length of pvc pipe with a hole in the Vac, hose. You could split another piece of pvc, place it over the hole in the pipe and use it to create a variable bleed hole if you wanted.
    I like that idea. Simple and effective.
    I wish I had thought of that before I glued the inlet to the cyclone. Although at the time I had no idea the suction would be so good.

    Has anyone tried to make a spring loaded pressure release valve? I might experiment with that idea.


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  7. #6
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    Dude, you are vastly overthinking it! Just make a slip collar of PVC

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    Quote Originally Posted by woodPixel View Post
    Dude, you are vastly overthinking it! Just make a slip collar of PVC
    You are right. That's usually what I do.

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  9. #8
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    What sanding discs are you using Dave? The problem disappeared for me when I switched to using abranet, the extra airflow through sanding mesh seemed to be the difference.

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    Quote Originally Posted by richmond68 View Post
    What sanding discs are you using Dave? The problem disappeared for me when I switched to using abranet, the extra airflow through sanding mesh seemed to be the difference.
    Just the cheapies from bunnings with the holes.

    I added 2 x 5mm holes with a sleeve from PVC pipe as others suggested and it reduced the problem considerably. I created 2 small holes so that I can have none, one or two open to control the flow for various applications but with the sander I need both holes open. It still sticks a little but it is not too bad. I could always add a third hole if I need to.

    As others said, I was way overthinking it.

  11. #10
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    I should add that with the holes open I don't get the excellent dust removal I get without the holes. It is still good but there is a slight compromise involved.

    If I ever find the time, energy and money I'll prototype a valve just for the sake of experimenting. If it works I post a report here for others.

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