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  1. #31
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    Quote Originally Posted by Chris Parks View Post
    Please keep us up to date as I know others with the same saw will be interested as well. Your images are fine but if you want you can load them straight up to the forum if it helps.

    Is the front of the plenum curved or have you made it straight? Where are you drawing the air from?
    Front of the plenum is yet to be built. I need to go back and reread your earlier posts in a bit more detail first. Air will be drawn from the top as per your design, however I was planning to use a single 150mm connection.


    The slide out bit is not quite big enough. It will handle 45deg compound but not the 47 degrees I have since discovered the bosch is capable off. Of course it is not symmetrical either, as its different from left to right. I figured for the odd occasion that I will actually use the compound angles I can live with the escaped dust.

    I have to admit, I have owned this saw for a while now and have only used it for the most basic cuts, but I have discovered a truck load of really good features over the last few days whilst playing with it. Just realised late Saturday that you can adjust it for a zero clearance on the bottom (not actually sure what the part is called). You can remove parts of the fence for the more acute compound angles. There is various end stop options. Fences that slide out, table extensions etc. It is a pretty impressive saw and once set up its actually reasonably accurate!

    I am thinking I might just screw this altogether now without glue. That way if I discover problems I can just remake and replace those parts.

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  3. #32
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    BTW, might I add that I built the saw table to be 800mm wide. I think if I had made it 1000mm the hood would probably have not need any sliding inserts!

  4. #33
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    I settled on a single 150mm extraction duct to give it a try and I am very happy with it. The top plenum that the duct goes into is removeable if I change my mind but I am of the "if it ain't broke don't touch it school". Likewise I was prepared to wind up the VFD to 70hz but that is not needed either. I have been thinking it could be made in three modular sections, the outer section (wings??)on either side could be removed or better still hinged for the very occasional compound cut.
    CHRIS

  5. #34
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    If anyone else is considering doing this, I recommencement a table/hood width of about 1100mm. I went for 800mm and as I realise how much stuff this saw can do I am limiting myself. I am seriously considering building a new bench and hood.

    In the mean time, I will settle for 800m wide given this is a prototype. I ended up going for a flat back to the 'plenum'. I calculated the the area to be about 800mm * 22mm which should be about the same size as a 150mm pipe. The gap at the bottom I went for the 2.5x rule, so 800*55.

    I tried it today using my small 2hp DC with a 4" port and it was a total fail. I should get the CV1800 this week, so more tests will be delayed whilst I set up the ClearVue. Hopefully the CV1800 will perform better or its back to the drawing board.

  6. #35
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    Langwarrin, Victoria, Australia
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    This is an EXCELLENT idea !!

    Bugger ... there's another job on the "to do" list now !!
    Glenn Visca

  7. #36
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    I am glad I was able to help fill in your spare time Glen.
    CHRIS

  8. #37
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    I have been thinking about this on and off since I read this sensational post.

    My SCMS is very similar to the video posted by Wood Nerd; a Makita 10" sliding compound; and since I built my Mark I dust hood, while satisfied with the result, I always figured I could get it better.

    I note in the wood nerd video that chips thrown to the rear get quite successfully drawn up the plenum - which I agree is a sensational idea. However, chips that don't hit the sweet spot collection area don't get removed (and mine does this too).

    So rather than a single slot (or curved in Chris' case) at the rear of the hood, what does the collective wisdom think about something similar to a downdraft table - whereby, the plenum extends underneath the saw and is drilled with an appropriate number of holes of an appropriate size. Holes could be strategically located slots too I guess.
    Glenn Visca

  9. #38
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    My gut feel is any extra openings run the risk of reducing efficiency of main opening

    That said .... if the DC ran under the floor and no riser at the collection end i would imagine gravity of on your side and you are increasing efficiency of yhe system and extra collection would be viable

    Dave TTC
    Turning Wood Into Art

  10. #39
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    The answer can be a lot of things and get a good result, there is no single recipe but I have found that the lower slot works over a number of years so for me I will stick to that answer. The real single thing that needs to be the same for all answers is enough air volume and speed, if you have that then it simplifies things. When someone says to me my dust extractor does not do this or that the first question will always be what is the dust extractor and does it flow enough air. Glen, if you have the dust extractor that will do the job then go for it and try stuff. I will give you an indication of air flow, I can feel the air going past my face if I bend down a bit near the saw fence.
    CHRIS

  11. #40
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    Bit of an update of my first prototype hack. I managed to get the ClearVue hooked up today and there is a marked improvement. Its still way from perfect but at least it sucks up the dust. IT wont pick up the stuff already there unless I sweep it into the opening, but at least I can use the saw now and not cop a face full of sawdust.

    The plumbing from the CV is not perfect either, I have not glued anything in place as yet. I will duct tape up all the joints in the next few days and see if there is any further improvement.

    Once I plum in the table saw and bandsaw I will start a second prototype that allows me to fully use all the compound functions of the saw.

  12. #41
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    Before I post a link elsewhere to show what I and others have been doing with this saw I have a bit more to add. Because of the limitation of my hood the saw won't roll for compound cuts but there is a way around this keeping the shroud tucked up tightly on the saw. When I get the time I am going to cut and modify the shroud so the parts that restrict the movement either become removeable panels or preferably hinged so the once in a year I need to use it I can quickly change things. The one thing I won't do is increase the size across the front as I think it is this that makes it as good as it is. In general day to day use what you now see is what it will look like for all intents and purposes. I will be interested to see how Pearo's has evolved but he seems to rather busy at the moment putting the cyclone in.
    CHRIS

  13. #42
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    I decided to remove the bosch dust catcher port thingie yesterday because when using the saw for compound or mitre cuts the thing would spew all the dust away from the back of the dust cabinet. Bad move, now it just spews it up into the air and in every direction you can think of!!!

    I am starting to think that somehow a smalled dust collection device attached to the saw itself may be the better option, a bit like the bosch dust catcher thingie but larger and more effective. Something that will move with the saw when you do those compound mitre cuts.

    Eitherway, I am a bit starved for time at the moment thanks to work again, but when I get a chance I will investigate the alternatives. In the mean time the Clearvue is doing a stellar job and making a really bad situation manageable, I am well impressed by that thing.

  14. #43
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    Bumped for Ron B to look at.
    CHRIS

  15. #44
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    Chris
    Do you think there is any value in having the curved back sloping rearward from top to bottom? When you are cutting does any of the swarf hit the rear wall and bounce upward?
    Ron

  16. #45
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    Not that is visible, the CV 1800 has enough flow capacity that I can feel the air moving into the plenum if I put my hand in around where the saw fence is. The 1800 will outflow a 150mm duct so it would be possible to increase the air flow but the main duct is the problem. The recommendation of 235mm that is used for the Max is too big but in Oz there is nothing in between where as in the US 7" can commonly be had cheaply. I was nearly tempted to bring some 7" in when I did my last CV shipment but it was going to cause too much hassle so I dropped the idea.
    CHRIS

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