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Hi BarryWe should be speaking!Being located slap bang in the middle between the Yorkshire heavy woollen district and the Lancashire cotton belt - and there's still some of these industries going (it's not all dead) - I'm lucky enough to have a manufacturer of fine felted cotton or cotton/poly mix filter socks nearby. The company actually weave the filter materials as well as making-up the bags and they are the OEM for a number of UK industrial extraction systems manufacturers as well as being an exporter. This company is unfortunately trade account only, however if anyone would like me to get them a quote for bags I'd be happy to do so as I have an account there. They can supply bags down to about 1 micron filtration suitable for use on MDF dust, and whilst (from experience) these are not as effective as a pleated filter set-up, partly because they have less surface area, they are nonetheless a huge improvement on OEM stuff and MUCH cheaper, especially as they will happily produce any diameter and length you require (mine were made 450 mm longer than the OEM filter socks). I found the cost of buying "2 micron" filter socks from them a few years back to be less than 1/2 the cost of buying Coral OEM filter socks - and they were only 20 micron string vests. Similarly they saved me well over £100 on the cost of the 24 pocket filter set in the fine DX we have in the CNC.If anyone is interested in going down this path as an intermediate step, please PM me and I'll get some prices. Because these are not off the shelf items delivery is normally 10 to 15 working days.Thi is true of any woven filter material. I tend to throw a couple of buckets of MDF through the DX to coat it to start with...... :shock:From an engineering perspective (?) I've just taken an 8,000 cfm unit out of our premises which used to be able to extract our CNC, a panel saw and two pin routers running at the same time - just. The problems that Barry is highlighting with fine dust are very real. Our fine dust DX had a pocket filter capable of filtering 1 micron, but it was only effective after a run-in period of a number of hours when it was new. Once the filter had been loaded, however, it was sufficiently good that in general we were able to work at most of the machinery without masks most of the time. 0.5 micron filter socks are an impossibility, but it takes a lot less to coat the inside of a 1 or 2 micron filter sock to get it down to that sort of performance than it does to coat the inside of a 20 or 30 micron filter sock.Scrit
Hi Barry
We should be speaking!
Being located slap bang in the middle between the Yorkshire heavy woollen district and the Lancashire cotton belt - and there's still some of these industries going (it's not all dead) - I'm lucky enough to have a manufacturer of fine felted cotton or cotton/poly mix filter socks nearby. The company actually weave the filter materials as well as making-up the bags and they are the OEM for a number of UK industrial extraction systems manufacturers as well as being an exporter. This company is unfortunately trade account only, however if anyone would like me to get them a quote for bags I'd be happy to do so as I have an account there. They can supply bags down to about 1 micron filtration suitable for use on MDF dust, and whilst (from experience) these are not as effective as a pleated filter set-up, partly because they have less surface area, they are nonetheless a huge improvement on OEM stuff and MUCH cheaper, especially as they will happily produce any diameter and length you require (mine were made 450 mm longer than the OEM filter socks). I found the cost of buying "2 micron" filter socks from them a few years back to be less than 1/2 the cost of buying Coral OEM filter socks - and they were only 20 micron string vests. Similarly they saved me well over £100 on the cost of the 24 pocket filter set in the fine DX we have in the CNC.
If anyone is interested in going down this path as an intermediate step, please PM me and I'll get some prices. Because these are not off the shelf items delivery is normally 10 to 15 working days.
Thi is true of any woven filter material. I tend to throw a couple of buckets of MDF through the DX to coat it to start with...... :shock:
From an engineering perspective (?) I've just taken an 8,000 cfm unit out of our premises which used to be able to extract our CNC, a panel saw and two pin routers running at the same time - just. The problems that Barry is highlighting with fine dust are very real. Our fine dust DX had a pocket filter capable of filtering 1 micron, but it was only effective after a run-in period of a number of hours when it was new. Once the filter had been loaded, however, it was sufficiently good that in general we were able to work at most of the machinery without masks most of the time. 0.5 micron filter socks are an impossibility, but it takes a lot less to coat the inside of a 1 or 2 micron filter sock to get it down to that sort of performance than it does to coat the inside of a 20 or 30 micron filter sock.
Scrit
