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  1. #1
    Join Date
    Jul 2010
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    perth wa
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    Default 4' or 5' angle grinder

    before the fire in my shed i felt a vibration in my 12$anglegrinder from wa salvage and i was going to mreplace it but i dont know what size to buy

  2. #2
    Join Date
    Aug 2009
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    Quindanning, WA
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    I have one of each... 4" with a grinding wheel for grinding because I find it small and easier to handle and 5" with 1mm cutoff discs for cutting because the cutting discs for the 5" cutoff wheels last a lot longer than the ones for the 4".

  3. #3
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    Brisbane
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    A good 5" grinder is a lot more grinder..usually more powerfull and a bigger wheel, and more cutting depth.
    A 4" is a bit lighter and definitely better for getting into fiddly spots

    I currently have 4 grinders.....the 5 is a much faster job than the 4

    cheers
    Any thing with sharp teeth eats meat.
    Most powertools have sharp teeth.
    People are made of meat.
    Abrasives can be just as dangerous as a blade.....and 10 times more painfull.

  4. #4
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    Jul 2008
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    Lismore, NSW
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    54

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    As has been said, a 5" is best. I have a 5 with a 1mm cutting disc and it's a world of difference
    over the 4" with the same disc. I still like my 4's for grinding though.
    Don't purchase a cheapie though. Go spend atleast 100 bucks and it will last a long time.
    If you have the cash, spend about 350 bucks on a good Bosch 5" 1500W or Milwaukee 1500W beast.
    They have good features like soft start and anti-jam and don't bog anywhere as much when loaded

  5. #5
    crowie's Avatar
    crowie is offline Life's Good, Enjoy each new day & try to encourage
    Join Date
    Dec 2009
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    Faulconbridge, Lower Blue Mountains
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    G'Day Wodstok,
    A number of years back I worked in an engineering maintenance company, while the blokes liked to use the 4" angle grinders for reasons of lightness and manoeuvrability, I had to implement a monthly service plan for them for 2 of the 6 to ensure they kept working.
    The 5" angle grinders weren't available.
    For similar reason the boiler maker was using a 7" angle grinder rather than a 9" angle grinder.
    I personally have 2 x 4" angle grinders for light duty works [an older AEG plus a Makita] and a 5" angle grinder for heavier work [Falls Miller] plus a 9" grinder for big work [Bosch].
    It's a matter of assessing what you are going to be doing and not overwork the grinder [even give it a time of free running after heavy workout to allow the motor to cool before stopping].
    On the issue of the 1mm cutting disc's, please always let the disc do the work and never use them to grind as they only have 2 reinforcement layers of fibreglass.
    All in all always take care with grinders.
    I hope I haven't rabbitted on too much.
    Cheers, Crowie

  6. #6
    Join Date
    Jun 2010
    Location
    Canberra
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    5" without a doubt - with 4" you're only half way through a disk before you're hitting the gearbox.

  7. #7
    Join Date
    Aug 2004
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    All we generally use use @ work is 9 & 5inch grinders..................they give the best performance and bang 4 your buck!

    If you can get a good quality 5inch (Bosch,Makita,Hitachi) Under anything but the most demanding continual use you'll find it'll last a lifetime!

    Regards Lou
    Just Do The Best You Can With What You HAve At The Time

  8. #8
    Join Date
    Jul 2010
    Location
    perth wa
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    i have started working at the local bunninga (bibralake) and i can get a 5' makita for $99 ant i get 20% off the proffite so i think i mighe get that one.

    thanks
    tom/wodstok

  9. #9
    Join Date
    Jan 2004
    Location
    Mackay North Qld
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    Default

    With 4 and 5" angle grinders its clearly price against quality.
    Generally most 4 " grinders have less power, internally fitted brushes and bush bearings.
    Being cheaper they fail earlier than the 5" models.

    The 5" jobbies are more powerful, have externally replaceable brushes and roller bearings justifying a higher purchase price but ensuring longer life.

    Add to this the extra refinements that appear at this size /level of A/Grinder such as soft start and even the ability on a certain Hitachi model to run on Ac or DC power ( if you have never burnt up a grinder on a generator not running the correct revs you won,t know what I mean)

    Go 5"with as many watts as you can find.

    Grahame

  10. #10
    Join Date
    Dec 2007
    Location
    Sydney
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    5'' better. Glad I bought that size. the 4'' is just a little too small and consumables go too quick. Then there is power factor etc. My 5'' has done everything I have thrown at it. I'm amazed I didn't have a grinder in the arsenal until about a year ago. Flap discs and 1mm cutting discs for the win as well.

  11. #11
    Join Date
    May 2006
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    I bought a 5" makita for $99 at the big b. Was DOA so took it back and got a bosch. Hasn't missed a beat so far, and I've given it a hard life grinding away bricks as well as metal.

    You will find the $99 grinders are fairly weak in power. I would be spending more money and getting one with more power, as you will notice the speed slow down when grinding.

    Cheers,

    Tom

  12. #12
    Join Date
    Apr 2002
    Location
    Brisbane
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    Quote Originally Posted by montiee View Post
    . I'm amazed I didn't have a grinder in the arsenal until about a year ago.
    How are you suposed to injure your self properly without a grinder

    I've had the grinders out last couple of days......it always surprises me how much more go the 5" has than the 4".

    OH yeh.... those flap disks are a wonderfull thing.....very versatile and controlled agression.....I've been using them for a lot of stuff I would have previously used a grinding wheel for.....

    cheers
    Any thing with sharp teeth eats meat.
    Most powertools have sharp teeth.
    People are made of meat.
    Abrasives can be just as dangerous as a blade.....and 10 times more painfull.

  13. #13
    Join Date
    Oct 2008
    Location
    Mid North Coast NSW
    Age
    45
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    177

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    5" Cutting, 4" Grinding

    I have a 5" Makita and a 4" Bosch. The $85 blue Bosch kits are great, can't kill em, plenty of power.

  14. #14
    Join Date
    Apr 2010
    Location
    Rural Victoria
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    358

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    IMHO you should go for the Metabo 5" with variable speed. Heaps of grunt and reliable.

    You will throw the flap discs out the window when you can slow your ginder down and fit a sanding disc. Nothing looks better than a weld sanded flush especially if presentation is important. It is all too easy to put unwanted gouges into the material even with a flap disc.

    Might be a bit exxy for your taste at around $300......

  15. #15
    Join Date
    Dec 2007
    Location
    Sydney
    Posts
    109

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    Quote Originally Posted by Gerbilsquasher View Post
    It is all too easy to put unwanted gouges into the material even with a flap disc.
    I have NEVER EVER gouged using a flap disc. How one could do so is just unbelievable given that flap discs are flexible and mould relatively around what's being essentially sanded away. Old fashioned grinding discs yes you can gouge, not flap discs.

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