I finished a project last night that I've been working on for a few weeks now.
I bought a Bosch GSM10s mitre saw from axminster but was not impressed with the built in dust collection so designed a dust collecting hood to fit behind the existing fence to capture as much saw dust as possible yet maintain the full use of the saws mitring functions.
Made from 1/8" ply
This has two 68mm ports, one each end, built in to receive plastic guttering down pipe.
I wanted the saw mounted on a mobile unit that contained a Draper extractor. I bought the Draper unit about 3 years ago but despite having lots of suck it was very noisy and didn't have the best filtration. I raided my scraps pile and built a cabinet and fitted some locking castors from amazon. I found some 30mm polystyrene sheeting on Freecycle so 2 layers of this lined the cabinet to soundproof it to some extent. To provide the necessary extra filtration I bought some of these panel filters off eBay.
The door of the cabinet was designed around the filter units and allows them to be removed for cleaning or replacement as required. As the cabinet is sealed it forces the air expelled from the dust collector to pass through the filter.
The pipework runs down the back of the mobile cabinet to a 110mm soil pipe straight connector which I butchered to make a bulkhead fitting. To combine the two 68mm pipes I made a custom Y connector. I also drilled the Y connector to take a 30mm flexible hose fitting from the saws factory dust outlet.
To power both the extractor unit and the saw I installed a double socket on the side of the cabinet and tidied up all the cables with clips. The lead to power the socket is about 2m long and can be coiled up on the side of the unit when not in use.
I did some preliminary testing, I cleaned up everywhere around the saw with the hoover until it was spotless and then turned a 3" length of 2x2" softwood to dust. I'd say it collected 90-95% of the saw dust which is a massive improvement over the original arrangement.
For some videos showing the system in more detail look up my Instagram account. cheshire_cats_woodworking
Will