It is currently 29 Mar 2024, 02:37
tracerman wrote:Terry , thanks for raising this vexing and interesting question . I don't have an answer , but I do have the same concerns . Back in the eighties I bought a Startrite Cyclair 75 . It came with a 150mm flexible tube of about 2.5 metres long . This was connected to 100mm brown underground type tubing with push-fit joints , elbows etc . I suppose my question is , by reducing the flow down to 100mm ( over a total length of about 6 metres ) have I deprived myself of the full flow , or has the restriction actually increased the flow at the point of collection ? . I can imagine that if the system had been at 150mm throughout and 150mm at the point of collection ( probably not practical ) then the suction would have been brilliant .
Is there a simple way of measuring the suction at the various points of collection I wonder ? . In recent times the 150mm flexible has been reduced in length to about a metre after which it passes through the extractor shed side , across a short 1 metre flexible( 100mm ) and then into my garage where it is rigid 100mm for about 6 metres overall . Am I getting the best from this system ? .
Steve
Rod wrote:
RogerS wrote:For most 'light' users ( and 'light' is not meant in any derogatory sense) then 150mm is overkill.
RogerS wrote:Roger's Rules of Dust Control
Rule 1 - try to remove as much dust at source as you can
Rule 2 - Rule 1 is impossible to do very well on most SCMS. The Kapex is one exception that I know of.
Rule 3 - don't confuse chippings and dust. They are best handled differently.
Rule 4 - Rule 3 only applies if you generate a lot of either - especially chippings.
Rule 5 - what works for one person is not necessarily the best for another
RogerS wrote:Hi Terry
Glad to have helped.
Yes, 150mm is probably better but you'd need to have a beefier extractor to get the airflow. For a one-man band who only ever has one machine running at a time then I still say that 150mm is overkill.
RogerS wrote:I'd ring up RB Industrial and get their advice. This is the one I got DONALDSON P18116, TORIT BPP22269 Equiv CARTRIDGE FILTER from them.
Rob wrote:...And just for the sake of completeness given readers may well use this thread as a reference when considering DX for themselves....Terry also has the "cant live without" 3M 7500 with P3 filters so if he is using the little Vac for hand tools then that would supplement any risk of below 5 micron particle inhalation.
I use the 7500 all the time for any fine sanding operations IN ADDITION to other DX and particularly when turning and power sanding which is literally a cloud creator of fine dust. It works fantastically well, and I don't believe any DX environment should be without one.
TrimTheKing wrote:Another consideration, if it hasn't already been mentioned, is an air cleaner hat you turn on and leave for a while like the Jet AFS-500 or similar which I and maybe a couple of others in here have.
I have it on the ceiling and turn it on when I use my first dust making machine and it has a number of settings Slow/med/Fast and 2h/4h/8h. Once I am leaving the shop i put it on fast for 8h which then turns it off at the end. The amount of airborn dust it has picked up is frightening, even With using a 0.5m filter on the DX!
Well worth the investment imho.
Cheers
Mark
Wizard9999 wrote:
It seems many manufactures will make claims such as 'filters down to 0.5 microns', but the question I now understand one needs to ask is "what percentage of 0.5 micro particles are retained by the filter"? I fear this is a topic where the marketing men may well be playing fast and loose with the technical fact and may be giving some customers a false sense of security about the benefits of their chosen dust extractors. If a machine catches 5% of 0.5 micron particles it is 'filtering down to 0.5 microns', but many buyers may think that statement thinks it is capturing virtually all 0.5 micron particles.
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