It is currently 28 Mar 2024, 10:32
MikeJhn wrote:The purpose of any dust/chip collection is to reduce our exposure to harmful particles in some way, IMO cyclones are not the panacea of dust collection they at first seem to be, they do nothing more than allow a longer period between cleaning of the filters in your extraction system, they in fact increase your exposure to dust when emptying as they can not be used with a collection bag without some kind of cage that has to be removed through the dust to empty the container, (negative pressure inside the container) dust exposure is obviously directly proportional to the efficiency of the filter, if your dust or chip extractor discharges straight into a filter bag you have effectively reduced your exposure when emptying compared to tipping your arisings into a bag from the container below a cyclone which defeats the object of less exposure.
HPLV (vacuum cleaners) that use internal filter bags at least contain the dust for disposal, but are only as efficient as the porous nature of the bag, the discharge air will still contain any dust that escapes through the bags pores , these generally are used as extractors for small hand tools which create a lot of dust, sanders and the like, the best of these will have the facility to pipe the discharge air to convenient point outside the workshop, this also reduce's the noise of the brushed motor or motors.
LPHV (chip extractors) fitted with a large paper filter are more efficient at collecting larger particles from a Lathe, table saw and especially a planer thicknesser and usually have a large plastic collection bag hung below them with the filter above, good paper filters (much better than the blow up bags) have a paddle which turns inside to flick dust off the folded paper to allow any accumulated dust to fall into the collection bag below, this still has to be removed for disposal, but if disposed of prior to becoming full the neck of the bag can be closed easier than if left until the bag is bulging, wasteful on bags, but better for your lungs. When looking at LPHV extractors compare M3/Hr figures it is far better to overwhelm your requirements rather than just meet them.
The science of all this can be seen here: http://www.ukworkshop.co.uk/forums/a-gu ... 02025.html not sure if the link will work, but its a very good explanation of how both systems work.
Mike
RogerS wrote:I also have two of the recirculating filter units (one home-brewed the other a Jet 1000) but didn't always switch them on.
9fingers wrote:Phil. Try the print button at the top of the thread on the right
Bob
Stoatally wrote:I don't have a P/T at the moment, but I'm always looking to expand, and I was also thinking that is it not better to get a better spec now that will cope with future expansion than just meet my requirements now and have to get new stuff in the future?
TrimTheKing wrote:Stoatally wrote:I don't have a P/T at the moment, but I'm always looking to expand, and I was also thinking that is it not better to get a better spec now that will cope with future expansion than just meet my requirements now and have to get new stuff in the future?
That's mine and many others philosophy, if you have the money or are prepared to save then money, then buy once and buy right.
Cheers
Mark
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TrimTheKing wrote:I was talking specifically about tool/machine purchases Bob, but agree with you on other solutions.
Cheers
Mark
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Rod wrote:Rutlands are selling a bit of kit for £119
No idea if it's any good
Rod
Pinch wrote:Matt, you might find my new thread useful for some of your queries.
viewtopic.php?f=23&t=2562
Pinch wrote:I've recently made a lot of dust extraction improvements in my shop including the purchase of the Record Camvac with the 0.5 micron filter system. I'm preparing another video ("Oh no!" I hear you say ) showing all of my dust extractors, which you might find interesting. I'll do it anyway.
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