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  1. #1
    Join Date
    Mar 2006
    Location
    Newcastle
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    110

    Default Making my workshop healthier - my plan - can I get away with a 1hp unit?

    Here is what I have learnt over the last few days as I go about remedying the dust issue in my workshop.


    Background

    I have a small workshop 3m x 5 m. It has two doors, one at either end. I have recently discovered just how much dust is made by my Hafco SB12 table saw. It goes absolutely everywhere. I decided to get real about dust extraction. My Ozito wet and dry vac was no where near touching the surface.

    My primary goal is to decrease the health risks of dust. Second - easier to keep clean!

    My Current Plan

    The equipment I need to improve dust extraction on

    • Hafco SB-12 table Saw (main culprit)
    • Router insert in table saw wing (dust everywhere)
    • Mitre saw (Shop vac does ok at the moment.)
    • Makita Track saw (does ok with the Shop vac)
    • Occasional welding (gasless mig)


    It sounds my ideal setup would look include

    • Dust extractor external to workshop
    • 2hp to have the over 1000CFM spec from FAQ
    • PVC pipe to workshop then flexible inside


    I can externally locate the extractor out the back of the workshop which would see between 1m-5m of pipe to get to the workshop. With maybe 2m of hose inside the workshop to get to the “tools”

    Is any of my knowledge off track?

    Question

    I would love to get the 1hp extractor for size and budget, but only if it didn’t compromise health. Is there any way I could use the 1hp?

    Here is an example of the 1hp unit I am looking at.

    Carbatec Economy Single Bag Dust Collector - 1 HP | Carbatec

    Otherwise any recommendations for compact 2hp extractors?

    I’m assuming something like this …

    Portable Dust Collector - 2HP | Carbatec

    Thanks for your time.

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  3. #2
    Join Date
    May 2011
    Location
    Albury
    Posts
    2,506

    Default

    Don't waste your money on the 1hp you linked to. If you think about it that 1hp DE has - 1/2 the hp; a smaller fan; the filter bag also has to carry out the function of collection container - virtually no hope of being even 1/4 as good as the 2hp machine. I suspect you'd spend more time cleaning the thing than using it.

  4. #3
    Join Date
    Feb 2006
    Location
    Perth
    Posts
    25,927

    Default

    Quote Originally Posted by mote View Post
    It sounds my ideal setup would look include

    • Dust extractor external to workshop
    • 2hp to have the over 1000CFM spec from FAQ.


    DC external to workshop

    Stock 2HP DC with the 2 x 4" ducts won't have >1000 CFM.
    The manufacturers claims are incorrect, their measurements are made using a flawed standard.
    A stock 2HP DC with two x 4" ducts in action draws <600CFM
    The max that a single 4" duct can deliver using the average DC is about 420 CFM. Less if there are junctions or flex involved.

    To get anywhere near 1000 CFM the 2HP has to be modified along the lines similar to that shown in the stick about modifying this DC shown at the top of he dust forum.
    AND
    6" ducting must be used
    AND
    Dust ports on machinery have to be opened u up utiiize 6" ducting.

    AN alternative for a small workshop like yours is to use a stock 2HP DC to collect large chips and some smaller dust but to then add some forced ventilation to extract the fine dust from shed air.

    The target air flow is 20 room changes per hour but even 10 is better than nothing. You will probably need a couple of large bathroom fans to do this.

    Visually it wont be as nice as have having a large DC to extract direct form the source of the fine dust making (ie you will still have some dust on all flat surfaces) but its the stuff you can't see that matters.

  5. #4
    Join Date
    Mar 2006
    Location
    Newcastle
    Posts
    110

    Default

    OK thank you both!

    It looks like some good course correction there. I will forgo the 1hp and get a 2hp. Maybe I should look out for one second hand.

    Adding the bathroom extraction fans sounds like a good idea. Guessing one would be bringing air in and the other would be extracting it?

  6. #5
    Join Date
    Feb 2006
    Location
    Perth
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    Default

    Quote Originally Posted by mote View Post
    OK thank you both!

    It looks like some good course correction there. I will forgo the 1hp and get a 2hp. Maybe I should look out for one second hand.

    Adding the bathroom extraction fans sounds like a good idea. Guessing one would be bringing air in and the other would be extracting it?
    I would go with extraction for both fans and place the fans and air inlets on opposite walls to draw on as much as of the shed as possible.

  7. #6
    Join Date
    Mar 2006
    Location
    Newcastle
    Posts
    110

    Default

    Quote Originally Posted by BobL View Post
    I would go with extraction for both fans and place the fans and air inlets on opposite walls to draw on as much as of the shed as possible.
    Thanks

  8. #7
    Join Date
    Mar 2006
    Location
    Newcastle
    Posts
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    Default

    Here is my immediate plan to keep woodworking and get rid of the dust.

    I will eventually be building a storage unit off the back of the workshop to house the DC. But I don't want this to stop me cutting wood, building things. To ensure I can keep working safely I'm going to go and grab a 2hp unit. I will have to store it in the workshop but when I am using it I will roll it out the front door and run a 2-3m hose inside connected to my table saw. Storing it in the workshop is far from convenient but it is workable and is a good intermediate solution.

    Being inconvenient will get me into gear to build the external housing.

    I'm planning on grabbing the Carbatec unit. It seems about right for the price. Portable Dust Collector - 2HP | Carbatec - any other recommendation that would offer better bang for the buck?

  9. #8
    Join Date
    May 2021
    Location
    Sunshine Coast QLD
    Posts
    22

    Default

    This one, although not cheap, appears to be designed along the lines suggested in the giant “Dust thread”

    https://www.timbecon.com.au/sherwood...dust-collector

    No hose between motor/impeller and filter.

  10. #9
    Join Date
    Mar 2006
    Location
    Newcastle
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    110

    Default

    Quote Originally Posted by skypig View Post

    No hose between motor/impeller and filter.
    Thanks! I have done so much reading over the last couple of days and missed that bit! I think it is pushing my price out to far ... but then ... health!

  11. #10
    Join Date
    Jan 2014
    Location
    Sydney Upper North Shore
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    4,315

    Default

    Unless they are using a bigger impeller I can’t seem getting 1500CFM let alone “squeezing an extra 300 CFM” by eliminating a metre of hose.

  12. #11
    Join Date
    May 2011
    Location
    Albury
    Posts
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    Default

    Quote Originally Posted by Lappa View Post
    Unless they are using a bigger impeller I can’t seem getting 1500CFM let alone “squeezing an extra 300 CFM” by eliminating a metre of hose.
    Yes, as usual the claims are a bit over the top. Because of the close coupling and considering that the connection flex hose on the alternative machine is 5" it's very possible that the performance of the Sherwood unit is superior. If you didn't want to, or weren't sure you could, perform the surgery recommended in the 'sticky' it could be a good alternative. The other problem is that the price point of the Sherwood unit is taking you into low end 3hp territory.

  13. #12
    Join Date
    Feb 2006
    Location
    Perth
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    Default

    Quote Originally Posted by Lappa View Post
    Unless they are using a bigger impeller I can’t seem getting 1500CFM let alone “squeezing an extra 300 CFM” by eliminating a metre of hose.
    Some of timbecon's claims in the DC space in the last few years, especially the static pressures, have become highly questionable. The unit I did the modification two in the sticky is a sherwood product and that produce 568 CFM with the two 4"hoses connected. Assuming no interference, to get 1500cfm through 2 x 4" ducts would take about 20"WC and it would be screaming. A 4HP 15" impeller like on a cyclone can get close to 1500CFM but it has to use a 6" duct and more than 50Hz.

  14. #13
    Join Date
    Mar 2006
    Location
    Newcastle
    Posts
    110

    Default

    OK so, I picked up one of the 2HP Carbatec and set it up today. Its not "plumbed" in yet so I just had the flexible hose running outside, but wow ... what a difference! It was only plugged into the table saw but it made a massive difference!

  15. #14
    Join Date
    Jan 2014
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    Sydney Upper North Shore
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    Default

    My 2hp unit is fully modified as per the sticky with 6” in and 6” out including the inlet to the separator. If I remove the hose from the outlet of the impellor housing and pump straight from the impellor into fresh air, I don’t get a 300 CFM increase - just saying.

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