Isn’t that a myth?
Most certainly no.
In CNC ducting, dust can accumulate. Static charge builds up and a discharge can cause a poof or fire. One uses grounded conductive tubing or runs a grounded wire down the middle of their ducting to ensure no possibility of state discharges (into their “dust”).
Can’t dust exposure cause such allergies? Doesn’t he provide a lot of useful information, a nice calculator, and numerous useful links to references?
I’ve pointed the dangers of dust exposure in numerous postings (fell free to search for them). The particles can contain viruses (particularly exotic hard woods), teratogens, carcinogens, toxics, and irratants. These can cause all sort of health issue (many quite serious, especially if exposure continues), including allergies.
As I stated (please reread what I wrote) I basically agree with this numbers, but Bill’s numbers are also over-the-top. What he doesn’t do is say how well other schemes work. Many, much cheaper and easier, come very close to his numbers. Also, his numbers force one into a budget that is beyond what most “here” can afford. It’s all about risk management vs. budget. Practical advise, while acknowledging what’s near perfection, then the user gets to manage their risk (and/or ask questions).
Any air exhausted from the workshop needs to be replaced, so exhausting air outside may not be practical for some.
I pointed out the practical difficulties with outside exhaust. I clearly stated that one must be careful to not allow the exhaust to reenter, at least not too closely. Commercially, shops that exhaust outside often do so through one wall and take air in from the opposite wall or “far away”.
Yep, much simpler and less expensive options are likely adequate for most.
Festool (EPA/DIN/EU approved (even for asbestos)), amongst others, are unquestionably good. There are many others. Unfortunately, most as dangerous crap. Having a “HEPA” filter doesn’t make the unit acceptable for air safety. Any ole shop vacuum is likely to be ineffective. Check with the vendor and ask for their HEPA and vacuum testing certificates. If they say “what?” or “we don’t do that” or “we tested ourselves”, something is likely not good. Reputable vendors get outside lab testing.
Real equipment that really works isn’t likely to be the cheapest or low cost. Modest cost up is more likely to provably safe.
A shop vacuum, if the air can be dumped outside, is effective… but then one has to deal with all of the issues I pointed out.
How did you modify your Nomad enclosure to enable dust collection and what do you use to do it?
Numerous others have added dust collection to their Nomad enclosures. Search around. You can find my postings and see what I did as well. I replaced my Nomad enclosure with one of my own design. It had additional sound suppression.
There is sufficient room to obtain a “decent” amount of dust collection. Given the size of the Nomad, one has to compromise. Running the vacuum for some time after the job ends provides a good level of protection.
mark