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  1. #16
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    Feb 2006
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    Quote Originally Posted by rob streeper View Post
    I've been using Dewalt branded cutting wheels. My impression is that the binder isn't holding up as well with the 4" and 4.5" wheels at higher rpm as it does with the 6" wheels.
    Perhaps they are different wheel types/material/thickness etc?

    I've done some testing of linear speed versus wheel wear for the same length of cut and its pretty clear that the rpm wear the wheel more for the same distance of cut.
    I tested rpm on the same wheel type going from 12000 to 3000 rpm and at the lower speed there's about 35% more wear per unit distance of cut.

    This has significant implications for wheel dust as the binder (resin and fibreglass) ends up as dust neither of which is that good for us.

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  3. #17
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    Dec 2013
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    San Antonio, Texas, USA
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    The spec's of the wheels are the same as far as I can tell, all are 0.045" steel cutting Type 27's. I have also noticed that the 4" class wheels have a greater tendency to flutter when cutting thin wall tubing at 13k which goes away when run at 9k.

    I've been meaning to get some of the smaller diameter diamond rimmed wheels but haven't had the presence of mind yet. I'm very happy with the 14" size wheel in my low speed chop saw, probably cut a couple thousand pounds of tubing with it by now and it's still going strong.
    Innovations are those useful things that, by dint of chance, manage to survive the stupidity and destructive tendencies inherent in human nature.

  4. #18
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    Feb 2016
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    Canberra
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    The one I'm thinking of replacing is only 4". It goes like buggery, but it's a noisy bastard.

    I also noticed it was slowing slightly with zero load, as if it were running out of mojo. It was only occasionally (maybe 5 times over the hours total use. Job was 5 total.) and only lasted a second, but it was enough for me to hope it didn't let the magic smoke out before the job was done.

    Now, for a fantastically stupid question, can I still use the Arbortech and leftover 4" disks on a 6" model should I choose this? The bigger disks would certainly be useful... But perhaps they use different shaft sizes?

  5. #19
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    Quote Originally Posted by rob streeper View Post
    The spec's of the wheels are the same as far as I can tell, all are 0.045" steel cutting Type 27's. I have also noticed that the 4" class wheels have a greater tendency to flutter when cutting thin wall tubing at 13k which goes away when run at 9k.
    Wheel flutter could easily explain the wear and might just be the difference between 12 and 13k RPM as I've never seen any wheel flutter on any of my 5" angle grinder wheels.
    On my variable speed, thin kerf table saw there are definitely resonance/vibe points which I avoid by operating at lower or higher speeds.
    I can't see any flutter but it could still be there.

  6. #20
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    Dec 2013
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    If the grinders have the same arbor then you can use 4" discs on the 5"/6" grinders. Almost all here are 5/8"-11 with 7/8" flanges for discs. Makita brought in some 10mm arbor tools here years ago so you might have that spec.
    Innovations are those useful things that, by dint of chance, manage to survive the stupidity and destructive tendencies inherent in human nature.

  7. #21
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    Dec 2013
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    Quote Originally Posted by BobL View Post
    Wheel flutter could easily explain the wear and might just be the difference between 12 and 13k RPM as I've never seen any wheel flutter on any of my 5" angle grinder wheels.
    On my variable speed, thin kerf table saw there are definitely resonance/vibe points which I avoid by operating at lower or higher speeds.
    I can't see any flutter but it could still be there.
    I have 2 Dewalt 4/4.5" grinders and both show the behavior. I bought the 5"/6" grinder on a deal and haven't really touched the smaller tools since because it works so much better for me.

    On second thought, Dewalt is an American company and they are in the business of selling both grinders and discs...
    Innovations are those useful things that, by dint of chance, manage to survive the stupidity and destructive tendencies inherent in human nature.

  8. #22
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    May 2011
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    Albury
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    115mm (4-1/2") and 125mm (5") grinders are the more common sizes in Australia. Can't ever recall seeing a 6", not that I've looked. Generally the 4" discs will only fit a 4" grinder (16mm arbor) and anything bigger will use a 22mm arbor so if you want to use your existing tooling and discs you're limited to 4". Bit of a shame really because 5" is a so much more useful tool.

    Are you sure that the Makita doesn't just need a new set of brushes?

  9. #23
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    Feb 2006
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    Perth
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    Quote Originally Posted by woodPixel View Post
    Now, for a fantastically stupid question, can I still use the Arbortech and leftover 4" disks on a 6" model should I choose this? The bigger disks would certainly be useful... But perhaps they use different shaft sizes?
    100mm discs usually have a 5/8" bore (well all the ones at bunnings do) so they won't fit on a 115 or larger grinder.

    The 100mm TC toothed Arbortech wheel has a 22.2 mm hole. At work I use an Arbortech on a 100mm Makita as it came with an adapter for the discs that have 22.2 mm holes.

    150 mm grinders are not common here in Australia and there are few wheels available for that size and what they have are no thinner than 2.5 mm. To get thinner you will need to go on line but that doesn't help much if you need one in the next hour or so.

    A small grinder has one advantage and that is it can often get into places that a larger grinder cannot get into. I have borrowed the 4" grinder from work a couple of times to do that.

  10. #24
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    Feb 2015
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    Strathalbyn South Australia
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    1,141

    Default Angle Grinder recommendation?

    I have this jobbie, works well. The ol'man has always had makita grinders, brushes easy enough to obtain. I'm not a metal worker by any means and grinders are my least favourite tool. This one was about $20 more than the 4" and the extra disc size was useful cutting across the colourbond sheets for the shed, still had just enough reach when the disc wore down a bit. I think I would have been lucky to get two cuts out of a 4"
    I don't think that the words quiet and grinder are inclusive are they?? [emoji848]





    Single tool, push button lock for arbor.

  11. #25
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    Sep 2010
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    Port Sorell, Tasmania
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    592

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    After three 4 inch grinders, bought a 5 inch Makita (GA5021 model) about 6 months ago and love it. It has a proper handle at the back with a trigger switch, just like the 9 inch. It feels so much safer to use being able to stop the machine by releasing the trigger, particularly when using a wire brush. Its more expensive although Makita also make a similar grinder in their cheap "MT" range.

    Tony
    You can't use up creativity. The more you use, the more you have. ~Oscar Wilde

  12. #26
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    Feb 2006
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    Perth
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    Some of the new 125mm Makita's are nearly double the power (1400W) of the older 720W models
    Their weight ranges from close to the same as the 720W models to nearly double that of the 720W models.
    Presumably these heavier ones are a lot more rugged?

  13. #27
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    Jan 2008
    Location
    Melbourne
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    4 1/2. /115mm is a nice size, that extra 1/2” seems to make a big difference in usability- if you measured the area you would find there was almost double the amount of cutting material than a 4” . For cutting with a cordless you really want to be using those micro thin discs- they give a lovely clean cut and don’t require as much power to push them. If you have actual serious grinding to do- can’t beat a corded machine . Owning both is the best option, as 115 mm grinders are often on sale and are one of the simplest machines so you can’t really go wrong if you get a major brand .


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  14. #28
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    Apr 2009
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    Wollongong, Australia
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    131

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    Very happy with my corded metabo - tool-less disk change, variable speed. It's had a hard life over about 6 years but still going strong (after my 15 yr old makita finally died)


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  15. #29
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    Feb 2016
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    Canberra
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    I've not bought one yet. I gave my old beastie to my daughter's boyfriend. He needed one and is skint, so it seemed fair.

    Turns out Makita don't make a corded brushless angle grinder. How odd is that!

    GetToolsDirect seem to have good prices, so I was thinking about the recommendations everyone has made. I'll get one in a box so I can pop it up on a shelf neatly.

    Given I'm going to use this for carving with the Arbortech, corded seems wisest.

    Anyone have any last minute options or suggestions?

  16. #30
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    Nov 2005
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    Darkest NSW
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    I have the same Arbortech cutter, which I've used with a cheapo 4" corded grinder for a while. I like the idea of cordless for shaping/carving with this setup, but the Arbortech guy at the Canberra WWW show said to make sure that it met their recommendation for RPM (I forget the figure, 13000?). I was never able to find any cordless grinder which met this speed recommendation?

    Corded brushless might be the go I think

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