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  1. Thread: Choosing a VFD

    by BobL
    Replies
    7
    Views
    65

    Where does the "3HP" come from?

    Where does the "3HP" come from?
  2. Thread: Choosing a VFD

    by BobL
    Replies
    7
    Views
    65

    The first thing to establish i whether the motor...

    The first thing to establish i whether the motor is a delta (∆) or a star (Y)

    If the motor is a straight 415V ∆ then, short of a a complete rewind, the motor cannot be used at full power running...
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    279

    First thing I would do is inspect the internals....

    First thing I would do is inspect the internals. If it's encrusted with scale it could be a waste of time affecting any repair.
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    347

    This is what the MSDS says for Trefolex paste ...

    This is what the MSDS says for Trefolex paste

    PETROLEUM HYDROCARBON(S) 30-60%
    SULPHUR 10-30%
    TALC 10-30%
    VEGETABLE OIL 10-30%
    TALLOW <10%

    Interestingly the most dangerous thing in there...
  5. Replies
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    347

    I was too but I looked it up and found elemental...

    I was too but I looked it up and found elemental Sulphur (S8 - its molecule with 8 sulphur atoms)) is basically insoluble in water ~5g/kg (5 parts per billion) so it won't form much sulphuric acid....
  6. Replies
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    366

    A small but not invaluable consideration is...

    A small but not invaluable consideration is access.
    These are both 3HP VFDs the one on the left is a Powtran the other is an HY
    395166
    I just find it a lot easier to work on the one with the...
  7. Replies
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    366

    I've have had one person in an audience in about...

    I've have had one person in an audience in about 10 years asks me how VFDs work. It turned out he already knew the answer and was just checking if I knew. I told him to come and see me about after...
  8. I've got a slightly different helmet but with...

    I've got a slightly different helmet but with what looks like the same Weldclass/Promax500 viewer as yours.
    Mine has a 90 x 100 mm viewing area.

    In the last 6 months I've shown a couple of my...
  9. I think I paid $38 for a 1.6m 14TPI bimetal blade...

    I think I paid $38 for a 1.6m 14TPI bimetal blade but that was some time ago

    You could try Hughans
    We buy our Timber Mill Band saw blades from them.
    Address: 14 Hector Street, Osborne Park WA...
  10. Most saw doctors will make up a BS blade to suit...

    Most saw doctors will make up a BS blade to suit

    I get mine from https://www.alltoolsharpening.com.au in O'Connor
    I get Bimetal blades as they last longer and I also get them as variable pitch...
  11. Replies
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    560

    The 7.3m fan is only 2HP but 118 kg so 3Phase...

    The 7.3m fan is only 2HP but 118 kg so 3Phase with a VFD for slow start.
  12. Replies
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    560

    Yep - just one outlet needed. Multiple exits...

    Yep - just one outlet needed. Multiple exits (doors) will control air flow out of shed.
  13. Thread: Strange Pliers

    by BobL
    Replies
    7
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    279

    I keep mine clean and it to put a loop on the end...

    I keep mine clean and it to put a loop on the end of TIG electrodes (that signifies the cooler end), changing TIG tips, and handling work pieces that need to be kept clean.
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    560

    Unless you live in very cold climes, instead of...

    Unless you live in very cold climes, instead of recirculating the hot air and airborne gunk (solvents, welding fumes, grinding dust, etc) inside a shed, it's better to replace that with fresh air....
  15. Thread: Strange Pliers

    by BobL
    Replies
    7
    Views
    279

    They're known as multifunction welders pliers. ...

    They're known as multifunction welders pliers.
    I bought a pair like that at a welding shop about 10 years ago.
  16. Replies
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    560

    :oo: What, . . . . . you have space in the...

    :oo: What, . . . . . you have space in the ceiling for a fan?? :oo:
  17. Replies
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    366

    It's pretty difficult to explain VFDs without a...

    It's pretty difficult to explain VFDs without a lot of words, and any explanations with fewer words will usually leave a lot of gaps. I've had to do this many times, mostly at mens sheds when I visit...
  18. Replies
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    If it is too short you can alway s fit an...

    If it is too short you can alway s fit an "outrigger splash shield" (A piece of sheet metal or plastic clamped on the side of the stand on a bit of a slope so the drips run back into the tray)
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    401

    Maybe just check the length of the stand being...

    Maybe just check the length of the stand being able to catch all the coolant drips from the machine..

    The length needs to accomodate the drips off the back especially, wheel from the back of the...
  20. Thread: Where to live

    by BobL
    Replies
    19
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    836

    Interesting stuff Malb and had to follow it up....

    Interesting stuff Malb and had to follow it up.
    Some info here....
  21. Replies
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    478

    The steel used in chainsaw chains is relatively...

    The steel used in chainsaw chains is relatively soft so they can be sharpened with a file.
    On nost modern chains the cutter tops and sides are Cr plated and filing the steel underneath the Cr...
  22. Replies
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    478

    Sure but lots of files are used for sharpening,...

    Sure but lots of files are used for sharpening, eg chainsaw chain (HRC about 57), wood working tools (HRC ~50) so I reckon it would be worth repeating the the test on something harder.
  23. Replies
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    478

    Files - drag or lift when going backwards?

    Here's a dude doing pretty neat and convincing testa on effectiveness or otherwise of dragging or lifting files when going backwards.


    https://youtu.be/xbykic--SKA
  24. Replies
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    770

    Crikey that could have been a lot worse, Anyway...

    Crikey that could have been a lot worse, Anyway wishing you a speedy recovery and thanks for the detailed analysis and reminder about moving gear.

    I am reminded of a manual handling course I did...
  25. Replies
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    1,394

    6mm Rivnuts with oversize washers is how I...

    6mm Rivnuts with oversize washers is how I installed cargo hold down rails inside my vans on just standard body thickness steel and I am constantly amazed at what load they can hold.

    This is my...
  26. Replies
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    859

    That size needs about 3000rpm. Close up photo of...

    That size needs about 3000rpm. Close up photo of the drill bit tip might be worth seeing
  27. Replies
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    yes its definitely worth doing and it's to get a...

    yes its definitely worth doing and it's to get a really clean surface to improve powder coating adherence.


    Its better to get them to do it because if it goes pear shaped then you have comeback -...
  28. Replies
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    316

    yes its definitely worth doing and it's to get a...

    yes its definitely worth doing and it's to get a really clean surface to improve powder coating adherence.


    Its better to get them to do it because if it goes pear shaped then you have comeback -...
  29. Replies
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    126

    I believe it is possible set a current limit on...

    I believe it is possible set a current limit on the Ecogoo VFD - the 750W Ecogoo VFD probably uses a current limit of ~4A , so for the 375W motor I would limit that to say 2.5 or 3A and you should be...
  30. Replies
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    126

    These Hercus motors are 415V "STAR" connected and...

    These Hercus motors are 415V "STAR" connected and need to be doctored internally to be converted to "DELTA" to be able to run on 240V 3Phase, as provided by a 240V single phase VFD.
    OR
    You can use...
  31. Replies
    11
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    517

    I've had a couple of these weird "requests" -...

    I've had a couple of these weird "requests" - one was for items I purchased ~18 months ago and when I contacted the vendor they claimed they knew nothing about it. I wonder if hackers may have...
  32. Replies
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    1,210

    There may be no need to use a different motor. ...

    There may be no need to use a different motor.

    You can usually get full power safely from a 3kW motor using a 15A single phase circuit, and a 3.7kW from a 20A single phase circuit.
    Virtually any...
  33. Replies
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    316

    Powder is more durable but actual use depends on...

    Powder is more durable but actual use depends on a bunch of factors like
    - the ambient environment - powder coating is better in moist or corrosive environments
    - amount of handling - powder...
  34. My experience is that you usually end up with...

    My experience is that you usually end up with about the same $/x where "x" is things like total kWh, recharge time, total lifetime etc. If you're happy enough to deal with more batteries, and...
  35. Replies
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    353

    I squirmed a bit when I saw the tap continually...

    I squirmed a bit when I saw the tap continually spinning in the drill chuck. That looks like a good way to damage the chuck jaws.
  36. The "cold cut" saws you refer to in your links...

    The "cold cut" saws you refer to in your links are not really cold cut saws, they still emit lots of sparks, scatter swarf all over the place and are very noisy.
    A true cold cut saw runs at <20th of...
  37. Replies
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    414

    There's a few loctite products that are good for...

    There's a few loctite products that are good for >200C - there was one that was even good for 230C that I used on my Dispersed Oil Particulate generator that might be worth a look.
  38. Replies
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    388

    Aerosol is still available thru Element14. ...

    Aerosol is still available thru Element14.



    Maybe its my glass plate but the PLA I have doesn't stick that well to it - about the same as the plastic/carbon fibre sticker I have on the Al plate...
  39. Replies
    4
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    388

    Thanks for the info J&H - very useful. I've...

    Thanks for the info J&H - very useful.
    I've seen Dimafix used on Youtube clips and various comments, some claiming it was no better than glue sticks.
    I've now printed about half a dozen PLA...
  40. Replies
    4
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    388

    Small upgrade to 3D printer

    My printer came with a 4mm thick Al plate bed, covered by a ~300x300 mm plastic/carbon fibre, sticker cover, onto which the printing takes place. However the prints weren't adhering all that well to...
  41. Replies
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    978

    The hardest thing I have put threads into was the...

    The hardest thing I have put threads into was the 10mm thick Bisalloy plate which forms the lower half of the base of my tri-grinder lazy susan

    I went through 3 taps cutting the threads for the...
  42. Replies
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    816

    FWIW this is something I posted over on the...

    FWIW this is something I posted over on the woodies forum about VFD fan noise.
    The readings are taken at operator ear height or 1m from VFD in the case of the DC VFD

    Ambient : 43 dBA

    Belt...
  43. Replies
    17
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    978

    I agree with Grahame, I wouldn't even attempt to...

    I agree with Grahame, I wouldn't even attempt to tap a 1.5mm diameter in anything harder than mild steel .
    Would it be possible to anneal the steel and regarded it after drilling and tapping the...
  44. Replies
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    407

    If by "loop lugs" you mean "ring crimps" then I...

    If by "loop lugs" you mean "ring crimps" then I generally use these on all my VFD and motor conn
    394611

    The last thing I want to happen is for one of the phases to disconnect while the motor is...
  45. In this thread you will see a PDF "VFDs for...

    In this thread you will see a PDF "VFDs for Newbies" - read this for a detailed explanation - saves me reinventing the wheel.

    https://www.woodworkforums.com/f271/vfds-newbies-232742
  46. Sounds like the opening lines of a "Hobby...

    Sounds like the opening lines of a "Hobby Machinists Anonymous" confession :)

    Nice shop. Something to do on cold winters days. Is it in a basement?
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    502

    We had one of these in the uni workshop and I...

    We had one of these in the uni workshop and I loved using it.
  48. Replies
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    407

    When I tried an old radiator element and then...

    When I tried an old radiator element and then 2x150W incandescents, they generated a short/bright pulse of yellow light from coils and the motor went THUMP and was stopped dead in its tracks....
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    407

    It sounds right and You won't hurt the VFD by...

    It sounds right and You won't hurt the VFD by trying it.
  50. Replies
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    440

    FWIW, in my very cramped shed, my small welding...

    FWIW, in my very cramped shed, my small welding table is about 1/3rd the area of yours and only has a 12mm plate top.
    I used 4 , 50 x 50 x 5 angle legs but also added 5th leg ( 30 x 25 x 5mm) that...
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