Workshop and life hints, tips, tricks, safety and best practice

  1. arther dailey

    arther dailey Member

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    4,120
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    England
    hmmm, grease an electric motor s bearings while its running? well I was in the rewind game for years and first ive heard of that, never ever seen it done , and wouldnt expect to as most have pulleys cogs etc attatched ,so personally thats probably anti safety, two pump of grease stationary and unplugged! is enough , its not like petrol in an engine it doesnt get burnt up.
     
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  2. Robbie260 Member

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    Scotland highland
    the greatest irony is that common sense aint that common.
     
  3. Robbie260 Member

    Messages:
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    Location:
    Scotland highland
    Thanks for that its interesting its the accepted standard practice in my industry for all electric motors even ones that weigh well over a ton (of course the bigger the motor more grease is used), probably someone thought it would distribute the grease through the bearing more effectively if done while the motor was running and the procedure/logic has stuck at some point. Maybe why we all are continuously sending motor off to be rewound.
     
  4. Brad93

    Brad93 M J B Engineering

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    Essex
    Old welding leads/earth cables can be made into great rotary earths when welding round parts or something you don’t want any arc strikes on.
     
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  5. nickk Forum Supporter

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    Observe when cutting framework with a disc cutter,there’s tension within the fabrication,so stop short of cutting right thru,leave a whisker,and cut the last bit with a saw.
     
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  6. Brad93

    Brad93 M J B Engineering

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    Very useful graphic on the proper nomenclature of allen/hex grub screws
     
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  7. addjunkie

    addjunkie Member

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    Northumberland. Reet oot in the sticks
    You also need to be careful greasing ex motors as you can damage the ex rating.
     
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  8. Arc Tourist

    Arc Tourist Forum Supporter

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    Its confusing overseas as well, where kerosene is considered a fuel, and paraffin is a type of wax often used to slick up surfaces such as a saw table.
     
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  9. brightspark

    brightspark Member

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    yarm stockton on tees
    nowadays u need a job method to do the simplest of tasks .no one has a mind of there own or any common sense and needs guidance . im glad im the age I am because all this crap that is fiested up on us nothing gets done:vsad:
     
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  10. Robbie260 Member

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    1,086
    Location:
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    I take it you are meaning intrinsically safe motors, i.e. explosion proof.
     
  11. Brad93

    Brad93 M J B Engineering

    Messages:
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    Location:
    Essex
    A useful bit of engineering maths.

    If you want to work out the perfect size of a circle, with two or more bigger circles to be touching all the way round. This is how you do it.
    You can see in the photo of the aluminium farriers toolbox what I used the calculation for.
     
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  12. pedrobedro

    pedrobedro Man at Matalan

    Messages:
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    Location:
    CX Derbyshire
    Paraffin fuel oil (kerosene) is distilled and is a petrochemical by product, mineral oil. Liquid paraffin is refined mineral oil and is used in cosmetics.
     
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  13. Lewis_RX8

    Lewis_RX8 Member

    Messages:
    451
    Location:
    Scotland
    Those things look like they would eat a few fingers for breakfast.
     
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  14. dobbslc

    dobbslc Member

    Messages:
    5,509
    Location:
    Hertfordshire UK
    It feels like pushing a tank up hill some days on site with all the RAMS nonsense! Especially HS2 sites! :vsad:

    Mmm I managed to switch one on once while I was holding it with my fingers by the blade!
    Took a chunk out one of them and the plane still has the bent foot plate were I slung it at the floor!
    It got switched on by the palm of my hand accidentally pushing in the lock button! I'm a lefty and this is a real problem with power tools that is generally ignored by the manufacturers!
    We need a lefty revolution to sort this one out! "Power to the popular lefty front" :artist:

    9. No words for this one.....
    20200519_091639.jpg
     
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  15. Agroshield Member

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    1,142
    It would be helpful if you could edit your post to note that 'n' is the number of external circles touching. In this case, it is 5, for the bottom of the stand. The piece of paper shows three circles, only two of which are relevant to the 'n' in the formula and which are themselves an abbreviated version of the problem.

    It is also necessary to say that the angles of which you take the sine are in radians. Put sin(pi/5) into the calculator on your phone and you will not get the correct answer.

    This is also a life tip: when doing any calculation, at least have some idea of the ballpark in which the answer lies. Pi is about 3, so pi/5 is about 0.6. Sine ranges from 0 to 1 as the degrees range from 0 to 90, so sine of 0.6 degrees is very small (nowhere near 0.59).
     
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  16. Agroshield Member

    Messages:
    1,142
    To be fair, that has more restraints against movement on it (looks like six in total) than many vehicles I see jacked up on people's driveways.
     
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  17. Brad93

    Brad93 M J B Engineering

    Messages:
    9,690
    Location:
    Essex
    You are of course correct.

    The angles are in radians and n is for the number of outside circles.

    I use a scientific calculator so switching between radians and degrees is easy.
     
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  18. addjunkie

    addjunkie Member

    Messages:
    6,265
    Location:
    Northumberland. Reet oot in the sticks
    Intrinsically safe refers to equipment like instrumentation designed as such it cant release enough electrical energy to create an ignition source in a hazardous enviroment. Usually done using a "barrier" in the circuit in a safe area.

    Ex is equipment designated for use in hazardous areas where flamable gasses may or may not be present. There are different classes from gas always present to it might be there, if things go pete tong.

    Worth learning about if you ever go the tanker route.
     
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  19. rtcosic

    rtcosic Member

    Pedant Mode <On>
    Pet Hate Mode <On>


    For at least 40 years the recommended English spelling is Kerosine with an i in the same way as Gasoline. Kerosene and Gasolene spelling went out with the Motor Spirit nomenclature (except for HMRC). However an astonishing number of marketers use the obsolete spelling of Kerosene. Just another thing they do to annoy us.

    Our colonial cousins of course mix and match and usually spell the fuels as Kerosene and Gasoline.

    Having spent my working life in the industry I put Petrol in my car, but made MoGas, DERV in a lorry but made ADO Automotive Diesel Oil. I used Paraffin for degreasing but made DPK - Dual Purpose Kerosine which met both the Domestic Kerosine and AvTur (Aviation Turbine fuel, Jet Fuel) specifications. DPK of course is not to be confused with the Class C1 Paraffin that should be used in Flueless Appliances like a Tilley Lamp - but we all knew that. These acronyms varied from company to company.

    The 'modern' product Paraffin wax to differentiate from the traditional product Beeswax. Liquid Paraffin is a pharmaceutical term not an oil industry one, so I have no idea of its origin and I'm not entirely sure I would ever want to use it as 'stool lubricant'. Maybe WD40 instead?

    Pedant Mode <Off>
    Pet Hate Mode <Off>


    Vaguely on Topic, possibly useful Mode <On>

    Another angle grinder spark target to avoid is steel wool - I set fire to 0000 grade steel wool in an open topped plastic box on an above head height shelf about 2 metres from where I was working.
     
  20. Robbie260 Member

    Messages:
    1,086
    Location:
    Scotland highland
    Thanks will look into that.
     
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