Home  5  Books  5  GBEzine  5  News  5  HelpDesk  5  Register  5  GreenBuilding.co.uk
Not signed in (Sign In)

Categories



Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
These two books are the perfect starting place to help you get to grips with one of the most vitally important aspects of our society - our homes and living environment.

PLEASE NOTE: A download link for Volume 1 will be sent to you by email and Volume 2 will be sent to you by post as a book.

Buy individually or both books together. Delivery is free!


powered by Surfing Waves




Vanilla 1.0.3 is a product of Lussumo. More Information: Documentation, Community Support.

Welcome to new Forum Visitors
Join the forum now and benefit from discussions with thousands of other green building fans and discounts on Green Building Press publications: Apply now.




  1.  
    Getting ready to pour our screed in the next few days and I thought I'd just crop down the odd holding down bolt that's excessively long and liable to poke out the top. (Our Structural Engineer said this was fine by the way).

    Having nearly scorched our walls when the angle grinder sparks melted through the rockwool I'd placed as a protective layer, I'm now considering options that don't risk burning the house!

    Realistically, have I got any chance of using bolt croppers (decent length 24"-30"), to cut through 12mm bolts? Or will my weedy arms just melt in the face of an immovable object?

    Any other ideas? I've so far counted 125 bolts...
    • CommentAuthorbarney
    • CommentTimeJul 9th 2018
     
    Acquired from a previous life, I have a pair of 42" bolt cropper that will do 16mm in mild steel and 14mm in tensile steel

    It's bloody hard work cutting a few let alone 125 of the things - I guess with a shorter croppers, you will really struggle. I'm about the square root of bugger all in terms of size - and I can just get the large croppers to cut 16mm mild steel threaded rod even when I'm resting one handle on the ground and using "mass" to assist

    I'd use a zip cutting disk personally speaking - and I'd be worried if you've managed to melt rockwool

    Just use a light wire frame and a soaking wet blanket or bit of sacking to "catch the sparks"

    Wear gloves and goggles and buy a few boxes of disks - enjoy

    Regards

    Barney
    • CommentAuthorSilky
    • CommentTimeJul 9th 2018
     
    it may go better with a larger grinder if you are using a smaller one, i.e. 235 mm, then the edge of the disc will not be as hot and cutting should be quicker
    • CommentAuthortony
    • CommentTimeJul 9th 2018
     
    Hack saw with the correct blade for me
  2.  
    Sabre saw (electric reciprocating hacksaw) with specific metal cutting blade
    New blade for each cut
  3.  
    Posted By: WillInAberdeenSabre saw (electric reciprocating hacksaw) with specific metal cutting blade
    New blade for each cut

    125 blades ???
    liberal use of cutting fluid should increase the blade life.

    +1 for the 235mm grinder if you go that route.

    36" bolt cutters would do the job, especially if you extend the handles by placing a tube over the said handles.

    Bolt cutters would probably be the quickest - especially if you extend the handles by 2 - 3 ft.
    • CommentAuthorbarney
    • CommentTimeJul 10th 2018
     
    Adding leverage to the handles will help you out - but essentially it's the battle between the blade and the bolt that's important - is why I suggested a bigger croppers - you need the blade capability to reflect the workpiece size

    As an aside, that's why you see security fences with asymmetrical mesh profiles - to get at them with a bolt croppers means grinding down the blade beaks - and the size and grade of the wire is designed such you'll probably shatter the blades - you may cut a few but it will really slow you down

    For 125 bolts it might be better to hire a small hydraulic croppers - ideally electrically operated.

    Regards

    Barney
  4.  
    Posted By: barneyAdding leverage to the handles will help you out - but essentially it's the battle between the blade and the bolt that's important - is why I suggested a bigger croppers

    36" bolt cutters will cope with 12mm bolts, its the grunt on the other end that is usually the problem - which is why the extra leverage works well.

    Posted By: barneyFor 125 bolts it might be better to hire a small hydraulic croppers - ideally electrically operated.

    +1
  5.  
    Only 12mm bolts,
    the thin cutting discs in a 4 1/2" angle grinder will make short work of those, this from personal experience, and only need to cut little over 1/2 way through before snapping off with a hammer, if one prefers.
    marcus
Add your comments

    Username Password
  • Format comments as
 
   
The Ecobuilding Buzz
Site Map    |   Home    |   View Cart    |   Pressroom   |   Business   |   Links   
Logout    

© Green Building Press