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Type: Posts; User: BobL

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  1. Replies
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    4HP SP technically requires a 20A circuit. 4HP...

    4HP SP technically requires a 20A circuit.
    4HP 3P on a SP-3P VFD can be made to run very safely on a 15A (even 10A if you know how to program the VFD)
    Using a VFD means the motor can run at say...
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    That DC less than desirable for effective dust...

    That DC less than desirable for effective dust extraction.
    The cyclone design is from the 1960's so it will generate a high back pressure which will affect the overall air flow..
    The manufacturer...
  3. Thread: Surge protection

    by BobL
    Replies
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    81

    If you are referring to RCDs then these are not...

    If you are referring to RCDs then these are not surge protectors as they operate at 240V and are a device that compares the current going through the mains active and neutral lines. If there is a...
  4. Thread: Surge protection

    by BobL
    Replies
    4
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    81

    Tripp Lite make a 3900J surge protector for about...

    Tripp Lite make a 3900J surge protector for about US$75 but its only available in 120V versions and its not sold by anyone into Australia.

    The most likely V surge through mains lines in an...
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    Yes good point. Was recently communicating...

    Yes good point.

    Was recently communicating with a relative in Northern Italy who has set up his dust collector in an enclosure outside his workshop. He has a built in diverter to the exit of the...
  6. There are many types of PVC and PU flex. Some PVC...

    There are many types of PVC and PU flex. Some PVC eg the stuff form carbatech is quite flexible but the stuff supplied a few years ago by Timbecom was definitely stiffer and HDPE flex (unfortunately...
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    I had a similar experience as a volunteer running...

    I had a similar experience as a volunteer running weekly half hour long woodcraft sessions at an aged care facility.
    Before I could start running any sessions I had to undertake a minimum of 3...
  8. As I said there won't be much much difference...

    As I said there won't be much much difference using a 2HP DC and even slightly restrictive machinery ports.
  9. Actually its the other way around. Whatever flow...

    Actually its the other way around.
    Whatever flow a DC/duct/flexy combo has with any flexible PU hose it always generates greater flow with stiffer hose.
    The stiffer the better, with the ultimate...
  10. If it was the super flexible PU then it performs...

    If it was the super flexible PU then it performs poorer than the stiffer PVC or even stiffer HDPE. The stiff 150mm PVC is about $30 a metre.
  11. Replies
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    It's not quite as "massive" as you might think....

    It's not quite as "massive" as you might think.
    This has been discussed before and here it is again.

    Let's assume you are planing 1mm off a 200mm wide board that is 2.4m long.
    That 1 x 200 x...
  12. Thread: Wobbly Workbench

    by BobL
    Replies
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    423

    The differential racking is probably due to the...

    The differential racking is probably due to the different degree of "tightness" of the screws which are a poor choice for a bench frame.
    As pounds says, well prepped joint faces are essential,...
  13. I've bought, lost, dropped, about a dozen of...

    I've bought, lost, dropped, about a dozen of these over the years.
    The cheaper ones tend to chew batteries faster and don't like being dropped as much as the branded ones.
    I've still got two...
  14. Replies
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    SWMBO would be a bunny compared to the council. ...

    SWMBO would be a bunny compared to the council.
    Imagine the headlines.

    "Asbestos Beach house demolished using bulldozer"
  15. Thread: Harvey G700

    by BobL
    Replies
    26
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    514

    13" All my extractable machines are inside 25...

    13"

    All my extractable machines are inside 25 m^2 so relatively short ducting runs.
  16. Thread: Plastic bags

    by BobL
    Replies
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    282

    Hot air gun set on "low" on the metal bend might...

    Hot air gun set on "low" on the metal bend might soften (or even melt) the plastic so it self seals?

    Polyethylene melts between 100 and 120C so some experimentation may be needed.
  17. Thread: Harvey G700

    by BobL
    Replies
    26
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    514

    I had a 3HP SP twin bag DC outside my 42m^2 shed....

    I had a 3HP SP twin bag DC outside my 42m^2 shed.

    Last year I converted the motor to a 4HP 3P plus VFD Upgrading a 3HP Single Phase DC with 4HP 3P motor and VFD

    Even before the upgrade my...
  18. Replies
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    I agree, although I then would have to listen to...

    I agree, although I then would have to listen to SWMBO rant and rave on about it for the rest of our lives.
  19. Thread: Harvey G700

    by BobL
    Replies
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    514

    The dustiest thing I do in my shed is turn, when...

    The dustiest thing I do in my shed is turn, when doing so my dust detectors say that at my turning work position I'm exposed to the same level of dust as is outside my shed up wind from where my DC...
  20. Thread: Harvey G700

    by BobL
    Replies
    26
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    514

    It depends on the specific nature of the woody...

    It depends on the specific nature of the woody hobby and as you said when discussing VFD noise that some even low amplitude frequencies affect different people in different ways.
    Wood turning is an...
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    Yesterday was supposed to be the last day on this...

    Yesterday was supposed to be the last day on this job as the house will be made available for inspection as from Wed this week.

    However, it looks like we will have to go back one more time mainly...
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    Oh yes you can :) - well at least the second half...

    Oh yes you can :) - well at least the second half of the story anyway

    Cremains Mistaken for Cocaine

    One way or another I suppose its still a joke?
  23. Thread: Harvey G700

    by BobL
    Replies
    26
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    514

    The 2HP DCs I have played with have been in the...

    The 2HP DCs I have played with have been in the 82dBA range but this is non issue when any DC is located outside the shed or in an air tight enclosure inside the shed. This is the simplest and most...
  24. Well in that case the value of the 3x3m shed...

    Well in that case the value of the 3x3m shed needs to split into ~3.
  25. OK but then one might ask why so big?

    OK but then one might ask why so big?
  26. Unless you are turning or sanding 40 hours a week...

    Unless you are turning or sanding 40 hours a week there's no need to spend $7k on fine dust control in a 3 x 3 m shed.
    For the average weekend warrior a modified 2HP DC located outside the shed, or...
  27. Replies
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    Well, I thought it was all done and dusted but it...

    Well, I thought it was all done and dusted but it turns out we need to go back one more time.

    The ceiling crack repair with liquid nails I described above has failed so will need to go back and...
  28. Thread: Library problems

    by BobL
    Replies
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    464

    SWMBO was a librarian. A few weeks after we got...

    SWMBO was a librarian. A few weeks after we got married I remember going around to her folks place to pick some of her stuff still remaining there. As perhaps to be expected from an avid reader and...
  29. Thread: Lathe and BMH

    by BobL
    Replies
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    286

    Yes it would. Must do a test in this some time. ...

    Yes it would. Must do a test in this some time.

    One also needs to bear in mind that Vacs are limited by the small size of their impellers which is why they don't draw much more air through a...
  30. Thread: Lathe and BMH

    by BobL
    Replies
    5
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    286

    The ultimate/optimum profile for a BHM requires a...

    The ultimate/optimum profile for a BHM requires a trombone or horn like structure about 10x the length of the diameter of the duct. For a100mm (4") diameter BMH that translates to about a a 1m...
  31. Thread: Clearvue adaptor

    by BobL
    Replies
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    363

    I don't think the plastic used by ClearVue is...

    I don't think the plastic used by ClearVue is acrylic but PET, I don't think acrylic would be suitable in that application as it will in time go brittle.

    It depends what sort of plastic that...
  32. Sure - and that also what David Swan also said on...

    Sure - and that also what David Swan also said on this mornings Health Report on RN.
    Nevertheless he also said it's such a strong correlation, even as low as the 1 g/m3 level, that fine dust...
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    Another day at the salt mine mainly spent...

    Another day at the salt mine mainly spent delivering stuff to people.

    This morning we had a sofa, King single bed and base, wardrobe wall unit, 2 washing machines and a drier to find homes for.
    A...
  34. Replies
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    I wouldn't say baseball and basket ball are...

    I wouldn't say baseball and basket ball are outliers as they (especially basketball) are pretty much a worldwide these days. Here in Oz we have state teams and a championship in both those sports. We...
  35. As you can see above I have a full beard and it's...

    As you can see above I have a full beard and it's why I use a full face positive pressure respirator - the overpressure provided by the battery powered fan unit is enough to keep the fine dust out....
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    Firstly welcome. Just a heads up that like the...

    Firstly welcome.

    Just a heads up that like the USA, many Australian's and lots of folks on this forum may not have much anglophile sympathy. Even many Australians with anglo connections i(usually...
  37. Replies
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    Not much, for example a 10 mm hole, can at DC...

    Not much, for example a 10 mm hole, can at DC pressures only draw about 1 CFM. That assumes the full pressure is available at the hole entrance so no other way for the air to get into the DC ducting....
  38. It turns out that fine dust pathways into the...

    It turns out that fine dust pathways into the body is not just lungs but stomach, eyes and even (especially clean) skin.

    BTW Latest PM2.5 in my home office is <0.1 g/m3, PM 10 is 0.7 g/m3
    The...
  39. Replies
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    More than 15 years ago when the 12m long back...

    More than 15 years ago when the 12m long back fence (timber frame and asbestos sheet) blew down during storm so I discussed thiswith the prickly bastard neighbour. I got a couple of quotes for a new...
  40. Yep - when they're burning off in the Perth Hills...

    Yep - when they're burning off in the Perth Hills (30km away) I can measure PM10 levels as high as 500 microgram/m3 and it you are nearer the fire or the fire is large the levels can easily go way...
  41. I agree the article is pretty complicated. ...

    I agree the article is pretty complicated.

    What the article really points to is that even short term low PM2.5 exposures can cause problems for seniors .

    The CURRENT WHO recommended exposure...
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    It turned out I didn't not get very far after I...

    It turned out I didn't not get very far after I got dressed up in the PPE as shown in the above photo. I had swept up less than half the floor when the respirator batteries started to go flat so had...
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    Looks like you need to get a better helmet?

    Looks like you need to get a better helmet?
  44. Health effects on seniors from short term exposure to fine dust.

    Some new research findings in the British medical journal.
    Most folks think that fine dust only really affects lungs.
    Time to think again folks - especially ion you are a senior

    The target...
  45. The sheds I have provided dust extraction advice...

    The sheds I have provided dust extraction advice to have been a mixed bag.

    One small mens shed has invited me back 3 times over 18 months to (re)discuss possibilities and they are still no...
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    Not at the tip but in a skip at a former...

    Not at the tip but in a skip at a former workplace I once found a 20L steel drum nearly full of near new half decent mechanical tools like spanners, screwdrivers, sockets, etc. The tools were mostly...
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    That's less than 10% of a difference - i'd say it...

    That's less than 10% of a difference - i'd say it wouldn't make any difference in terms of safety.
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    Yep!

    Yep!
  49. Replies
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    About to start the shed sweep. 464845

    About to start the shed sweep.
    464845
  50. Thread: Learning to drive

    by BobL
    Replies
    37
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    860

    It's very difficult to determine direct causes of...

    It's very difficult to determine direct causes of changes in crash related statistics.

    On one side there are things like better/safer vehicles, better health care facilities, improved roads,...
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