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Disc for cutting sandstone paving?

Discussion in 'Building' started by goldeagle, 10 Sep 2021.

  1. goldeagle

    goldeagle

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    I'm in the process of laying a DIY patio with 25mm smooth sandstone slabs.

    I did consider hiring a specialist Stihl type masonry saw for the cuts, but at £30 for a weekend and knowing I would probably end up needing it for the next 6 weeks at the speed I work, I decide to purchase a 125mm angle grinder instead, as it's just for a single patio.

    I am really struggling with cutting the slabs though, or specifically the diamond blades I'm using are generally only last 3 or 4 cuts (sometimes that's on a single slab) before giving up and having to replace with a new one.

    So I suppose my question is - can anyone recommend any good blades or have any tips for using a 125mm angle grinder for cutting sandstone?

    I general have it on speed 2 (i.e. fairly slow speed) and have tried both cutting through the entire 25mm slab at once or doing it in two passes to avoid too much load on the blade.

    By the 3rd or 4th pass the blade is really struggling to get through and appears to be showing signs of over-heating - but I think this is just because it is not sharp enough to get through.

    Tried all types and brands of diamond blade:

    Bosch Professional
    S&R diamond cutting disc
    RDXMax cutting disc
    Bosch Standard
    Graff diamond blade

    None have performed any better than others ( at least not noticeably), all fine on the first and second cut but then quickly fail.

    I have a lot of cutting to do and at this rate I will be spending £300 on blades so would appreciate any advice!
     
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  3. goldeagle

    goldeagle

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    Here is a pic of a knackered blade can see over-heating marks

    20210910_173018.jpg

    The angle grinder is 125mm Makita 18V LXT. Using it with a dust extractor hood.
     
  4. lostinthelight

    lostinthelight

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    Cut from each side and usually no need to go right through, much less strain on blade and machine that way.Id speed-it up to clear the dust and let the weight of the tool do the work
    edit: you have a vacuum on it then ?
     
    Last edited: 10 Sep 2021
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  5. goldeagle

    goldeagle

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    Thanks, that's not a bad idea actually going half through on one side and half on the other. I have noticed a lot of wear on the centre (non-cutting) part of the blade due to the depth I'm going through. Definitely worth trying anyway.

    I will also try a higher speed and see if that helps (I thought I read somewhere slower speed was recommended but will give anything a try!)
     
  6. lostinthelight

    lostinthelight

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    Have you got the blade the right way around ?
     
  7. goldeagle

    goldeagle

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    as far as I know, yes...the label is facing out and on the blades that have a direction arrow it's in the same direction shown on the grinder
     
  8. lostinthelight

    lostinthelight

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    Just checking,ive seen peeps turn the cutter over to fit and loose their sense of direction:LOL:
     
  9. goldeagle

    goldeagle

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    maybe a stupid question, but what direction should the blade be turning when cutting into the paving (if that makes sense) - should it be rotating downwards as you cut forwards, or rotating upwards? Or does it not matter?
     
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  11. cdbe

    cdbe

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    Strange! Have you tried a "turbo" blade. Or a different grinder?. Half the problem is that tools are big boys toys and despite there being nothing "turbocharged" about angle grinder blades the manufacturers insist on these silly names instead of agreeing a common standard for performance/materials. Personally I've never used a battery grinder but given that my mains 115mm grinder is 900w and my 9" grinder is 2400w I think that could also be your problem.
     
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  12. goldeagle

    goldeagle

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    yeah one of the Bosch discs I've used was classed as a turbo disc. I am starting to think it may be blade direction in relation to the slab, I was fixed with the blade direction due to the bust shroud only fitting on one way. Will try it in the morning
     
  13. 23vc

    23vc

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    Diamond disc (including the cheaper eurbaur type ones) on a 5” grinder is fine. Couple of deep passes then snap it off
     
  14. 23vc

    23vc

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    blade fitted to the grinder according to the arrow on the grinder, then cut towards you
     
  15. Charlie George

    Charlie George

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    A cordless grinder is not the right tool,with hindsight you may have been better to lay all full flags and saved the cuts for the last weekend,and hired a petrol saw then.
     
  16. goldeagle

    goldeagle

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    Diagram below is what I am currently doing...blade rotating upwards, pushing the tool away from me is that right?

    grinder.png
     
  17. lostinthelight

    lostinthelight

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    They're only 25mm slabs, if one has enough batteries or time to recharge I cannt see a problem with a battery jobbie.
    In decades of using a disc cutter ive never had one turn blue like that
     
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