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  1. #1
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    Default Noise Suppressor for RL 125

    I have a Felder RL 125 dust extractor in my shop. I am very happy with it but it is noisy - measured today at 92dB. I always wear ear protection when it's running because it is even noisier when there is a running machine attached.

    Felder make a noise reducer that fits over the exhaust of all their RL varieties but they appear to be unreasonably expensive. I was hoping to attempt to make a baffle myself and I know others have done so with reasonable results.

    Just wondering if any forumites have made their own baffle or if they can point me to somebody who has.

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  3. #2
    Join Date
    Feb 2006
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    The best DC noise supression is to locate it outside the shed.
    That way if it ever leaks the dust won't fill the shed.
    It depends on the size of a shed and if there's a spot outside when it can be located but I reckon shed floor real estate is too valuable to use up on housing a DC.

  4. #3
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    Default

    Yes, I hear you regarding shed floor real estate particularly since the RL 125 is quite sizeable but locating it outside is not really an option in my situation. Incidentally, dust leakage has never been a problem - these units are notable for the efficiency of their Hepa filtration and are one of the few units actually licensed to be used indoors - certainly in Europe anyway according to Bill Pentz. But I'm sure you know this already.

  5. #4
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    Put it in a enclosure and use a baffled air return would be one way but it could cause high internal temperatures if run for long periods. A box lined with an acoustic material should do the job as long as the baffle is designed properly. Bradford supply acoustic batts or something like Dynamat would work but the batts would be cheaper. I used a baffled exhaust on my cyclone and reduced it from 92 to 68 from memory. This link will show what we did using a baffle design

    Noise Reduction - CV1800

    PM me if you need more information or have other questions about it. This may help as well Clearvue Noise Problems - Take 2

  6. #5
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    Jun 2007
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    Default

    Thanks for the response Chris. I had actually looked at that thread previously but baulked at the nature of the beast.

    I just wish I could see what's inside the rather small sound damper that Felder make...

    I'm about to hi-jack my own thread...


    Just as an aside and because this thread has RL 125 in the title, I thought I would digress slightly and refer to the little light on the main switch of this unit which illuminates when switching the unit on but then goes out once the machine is up to speed. It has to do with the differential pressures between dust collection box below and the HEPA filter that sits above it giving an indication of the state of the filtration system. If it stays on, it indicates the filter needs cleaning. Mine stayed on today and in the process of inspecting the machine in general, I found this:

    IMG_4061.jpg

    I presume these are capacitors and the lower one looks like its had a real boil-over. I don't know why - I'm aware of the holding the start button in thing so I don't think that was the cause but anyhow, I will get a new one and plan to replace it myself. I know capacitors can hold a considerable charge even when switched off and wonder if I'm placing myself in any danger or not by attacking it?

  7. #6
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    Quote Originally Posted by Dovetail View Post
    I presume these are capacitors and the lower one looks like its had a real boil-over. I don't know why - I'm aware of the holding the start button in thing so I don't think that was the cause but anyhow, I will get a new one and plan to replace it myself. I know capacitors can hold a considerable charge even when switched off and wonder if I'm placing myself in any danger or not by attacking it?

    They should be shorted out before tackling them. The ideal thing is a 10W ceramic power resistor - looks like a small block of chalk with two leads.
    Make sure power is off - removed power cord from socket
    Use the resistor to short the leads of the cap before removal

  8. #7
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    Default

    Thanks Bob. Job done. Felder NSW were super-efficient and sent the new capacitor overnight.

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