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Type: Posts; User: BobL

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  1. When you buy a replacement motor I recommend...

    When you buy a replacement motor I recommend buying one with twice the HP of the original. This will to some extent overcome the loss of motor power at <50Hz.
  2. Unfortunately the motor will almost certainly be...

    Unfortunately the motor will almost certainly be a 1450 rpm motor so it won't be good at either of these tasks although a pair of pulleys and belt couple be employed as an RPM doubler?
  3. A friend of mine bought a new DP for $450, and a...

    A friend of mine bought a new DP for $450, and a used 3P motor for $50, he removed the motor froth DP one and sold it for $100.

    Swapping the motor sounds easy but there are a few other things to...
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    6" of mercury = ~20.3 kPa about the same as a...

    6" of mercury = ~20.3 kPa about the same as a Ryobi Wet and Dry Vac.

    Most household vacs should pull 16-18 kPa, maybe consider getting new filters and check seals as they also probably also have...
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    If that is 6" of water column then that is not so...

    If that is 6" of water column then that is not so good ~1.44 kPa
    If its 6 psi then that's really good max vacuum and is equivalent to ~40 kPa
    Festool vacs have 24kPa and my old Ryobi is 21kPA.
    ...
  6. Thread: Dust masks

    by BobL
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    374

    $2400 from BOC, $1600 for older models on ebay.

    $2400 from BOC, $1600 for older models on ebay.
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    That's basically what I did for my grinding dust...

    That's basically what I did for my grinding dust collector which is connected to my 4HP wood dust extractor.
    The cheap silver (aluminized mylar) has some heat resistance so it doesn't matter if...
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    That's basically what I did for my grinding dust...

    That's basically what I did for my grinding dust collector which is connected to my 4HP wood dust extractor.
    The cheap silver (aluminized mylar) has some heat resistance so it doesn't matter if...
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    I've seen a few different floor mounted...

    I've seen a few different floor mounted tool/machine posts. One I was thinking of copying was a socket made out of ~100x5mm SHS set into the floor. It was actually recessed into the floor and had a...
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    It depends to some extent if you use lube or not....

    It depends to some extent if you use lube or not.

    I do use lube so I like using a wet and dry shop vac as they have a sort of "settling out" chamber that reduces the amount of oily swarf swarf...
  11. Thread: Dust masks

    by BobL
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    374

    I bough mine about 15 years ago from Carbatech....

    I bough mine about 15 years ago from Carbatech.
    I think mine cost $299
    But I don't think they are being made any more - can't see them for sale online anywhere.

    Carbatech now sell the Trend...
  12. To compare those two you need to multiply the 2.7...

    To compare those two you need to multiply the 2.7 by SQRT 3 so then it comes to 4.7A?
    Unless those VFD display amps are @415V



    Yeah could be the meter but maybe not the wave form - more...
  13. Thread: Dust masks

    by BobL
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    374

    For that sort of thing I used a battery powered...

    For that sort of thing I used a battery powered full face respirator with 2 x P2 cartridge filters.

    Once the batteries had run down a bit mine lacked sufficient air flow for use on cold days so it...
  14. , VFDs usually show per phase current so x...

    ,

    VFDs usually show per phase current so x sqrt(3) to get total current.
    That means 6A per phase = 10.49A total
    But are those currents @240V or 415V?
    If its at 415V you are going to be well...
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    I'm on my second pair of lefties. For short...

    I'm on my second pair of lefties.
    For short welds I usually don't wear a right hand glove at all, and if I wear a right hand glove I usually wear a TIG glove as it provides better feel than standard...
  16. Thread: Dust masks

    by BobL
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    374

    what sort of dust?

    what sort of dust?
  17. It's not only the simplest scenario it is also...

    It's not only the simplest scenario it is also the safest scenario for both the VFD and the motor. Unless suitable precautions are taken there should be no switches between the motor and VFD. Turning...
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    I had 12V Klaxon on 6V VW Beetle and it sounded...

    I had 12V Klaxon on 6V VW Beetle and it sounded like a drunk toad.

    If you run one on 6V and one on 12V you will get two frequencies and two sound volumes. a couple more and some different...
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    Yep just put the 2 , 6V horns in series across...

    Yep just put the 2 , 6V horns in series across the 12V and you will be sweet!
    They will of course have to both sound off at the same time
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    Sorry to nit pic here but the rated current on a...

    Sorry to nit pic here but the rated current on a motor nameplate is not really the max current a motor can draw. Most motors can draw a lot more current that their rating if they are overloaded. eg...
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    This is mostly correct but I think it's less so...

    This is mostly correct but I think it's less so for welding.

    Back in the 1970's I mucked about for about 5 years with stick welders, bought and borrowed a few welders, watched pros welding,...
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    While I prefer black or grey, most of the 3P...

    While I prefer black or grey, most of the 3P machines in my shed are on orange cable from a roll. A couple years ago I found a roll of about 20m of of grey 600V 6 core cable in a skip which I have...
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    If you intend purchasing new I found it is...

    If you intend purchasing new I found it is usually cheaper to buy an extension cord and cut the socket end off than it is to buy the plug and same rated cable separately.

    Eg at Bunnings:
    HPM 3...
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    A few years back my young bloke worked for an IT...

    A few years back my young bloke worked for an IT company that go all their extension and computer cords tested and tagged but it was cheaper to just buy new cords. He collected up the old cords and...
  25. Thread: Hercus in Kenya.

    by BobL
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    Humm - with death rates per million from...

    Humm - with death rates per million from diarrhoic diseases of about 10,000, HIV/AIDs (~8000) and TB of about 1200 I suspect they're not too worried about the pandemic.
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    I'm not a big time user but I've used the Ausee...

    I'm not a big time user but I've used the Ausee ends mills and they seem OK

    It doesn't always suit but I've found I can do quite a few things using a small fly cutters for which the tool tips can...
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    I have some white Li grease as a spray, bought a...

    I have some white Li grease as a spray, bought a new can last year.
    The spray is semi penetrating - I use it for lubing WW machinery.
    I generally blow the dust off the thing I'm (re)greasing,...
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    I use moly wheel bearing grease - its supposed to...

    I use moly wheel bearing grease - its supposed to be good for slow-motion high-pressure applications. My 1967 purchased join vice got lubed that way in the 1980s and is still good and smooth.
    I also...
  29. I use the "Vibration" App by Diffraction Ltd....

    I use the "Vibration" App by Diffraction Ltd. It's only for iPhone/ipad etc.
    There are plenty of others out there.
    Some only measure the frequencies but you need ones that measure the accerlations...
  30. I have heard of using an old diamond/stone...

    I have heard of using an old diamond/stone cutting wheel as a dressing tool but not tried that myself.
    Before you go that route I found there are two other aspects ie runout and vibe, that are worth...
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    Talking to my steel fabricator mate and he...

    Talking to my steel fabricator mate and he doesn't seem to have any problems at the moment but he has heard the prices are going to rise in the new year so he's bought extra basic stocks. If others...
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    Yes we need you to better define your jobs,...

    Yes we need you to better define your jobs, mainly sizes of job, and thicknesses of materials and how often you wish to do this

    eg , bird cage , sheep cage or cattle truck, - daily - weekly -...
  33. Sounds like a Hercus would meet your needs and...

    Sounds like a Hercus would meet your needs and most models also start at around 50rpm.
    Using a vector drive VFD and a 3P motor that has twice the original motor power I can spin mine at about 15 rpm...
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    I tried using 150W incandescent as a braking...

    I tried using 150W incandescent as a braking resistor on a VFD and it was savage.
    There was a flash of bright light and it stopped almost instantaneously BUT the motor made a loud Thump/Grawnch,...
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    Yeah keep meaning to install a contactor (I even...

    Yeah keep meaning to install a contactor (I even have a couple of suitable spares in my stash!) but have only had to replace 3 relays in about 7 years. I bought a 6 pack of these relays for another...
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    Now that I think about it the 500W max relay I...

    Now that I think about it the 500W max relay I use on my 3HP TS has only failed when I have turned the saw off under load eg jammed the blade and then turned off the motor. Free running the saw...
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    Rather than reinventing the wheel maybe a have a...

    Rather than reinventing the wheel maybe a have a read of this?
    https://www.hw-group.com/cs/podpora/how-not-to-destroy-a-relay

    The relay on my 3HP TS switch is rated at 16A/230V
    But reading the...
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    Rather than reinventing the wheel maybe a have a...

    Rather than reinventing the wheel maybe a have a read of this?
    https://www.hw-group.com/cs/podpora/how-not-to-destroy-a-relay

    The relay on my 3HP TS switch is rated at 16A/230V
    But reading the...
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    It depends on the HP rating of the motor but from...

    It depends on the HP rating of the motor but from memory those relays have a rating of about 300 (if you are lucky) switching operations for a 2HP inductively loaded, switching operations.
    Even...
  40. Thread: More metal bluing

    by BobL
    Replies
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    11,612

    Somewhere amongst my bluing posts I referred to...

    Somewhere amongst my bluing posts I referred to how difficult it was for a DIyer to buy concentrated nitric acid for use in the bluing process which is understandable as concentrated nitric acid will...
  41. It really depends on size and amount of work you...

    It really depends on size and amount of work you do. My first D bottle lasted 9 months. These days I get 18 to 24 months from a D size as I went back to using stick for most of my regular steel...
  42. Thread: Scrap metal score

    by BobL
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    362

    Scrap metal score

    Went to visit an old mate yesterday who owns/runs an intermediate size metal fab shop, fabbing stuff mainly for local and mining industries. The businesses was set up by his dad about 60 years ago...
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    I run my ebay cheapie misters at 35 psi and slow...

    I run my ebay cheapie misters at 35 psi and slow flow rate, just enough to wet the cutter and work piece area being machined. If the mister is having trouble aspirating the lube/coolant you might...
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    That sounds like a lot of air for a mister, what...

    That sounds like a lot of air for a mister, what pressure are you using for the mister?
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    If you are thinking of sewing, try dental floss....

    If you are thinking of sewing, try dental floss.

    I made this strop belt about 13 years ago - don't use it much but its still together after all that time.
    All the sewn edges are cut on a slope so...
  46. I wondered about this especially as standard LED...

    I wondered about this especially as standard LED lights effectively produce white light ie all colours. However, there could be a difference between cool (bluer) and warmer (yellow) LEDs - see below....
  47. The Argon is not destroyed in the welding...

    The Argon is not destroyed in the welding process. It is harvested from the air (air contains about 1% Ar) and the welding process returns it to the atmosphere. What is "lost" is the energy needed to...
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    The problem with using a mask to avoid welding...

    The problem with using a mask to avoid welding fumes inside a shed is that for lowest exposure masks have to be continually worn for some time after welding has been completed. Just because the dust...
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    The 4" Joplin I bought in 1967 - which I still...

    The 4" Joplin I bought in 1967 - which I still have and still use is black but that is a fabricated (not cast) vice.
  50. Thread: More metal bluing

    by BobL
    Replies
    99
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    11,612

    A few things that went through the bluing process...

    A few things that went through the bluing process this week.
    These have only had 4 passes through the fuming tank.
    Though the black is not as "deep" as for 7-8 passes it seems to be enough to...
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