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Discuss Starrett KA19-N Oops Arbor - Two hole saws on one arbour in the Electrical Tools and Products area at ElectrciansForums.co.uk.

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  1. Midwest
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    Midwest Electrician's Arms

    Location:
    Oxfordshire
    I know someone posted on this subject quite recently, but can't find it, regarding a new arbour which you can fit two hole saws, one to act as a pilot to enlarge an existing hole.

    I tend to use the old 'cut at an angle' trick with the larger hole saw, but I've got a 60min ceiling thickness, and it's gonna make a bit of a mess with that trick.

    Can't find that thread, googled and found the above Starrett one, but I thought it was something newer?
     
  2. Wilko
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    Wilko Electrician's Arms

    Location:
    Berkshire
    Business Name:
    Wilko Electrics
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  3. rsgaz
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    rsgaz Regular EF Member

    Location:
    UK
    Have you looked closely at your current holesaw arbour?
    There may be a little bit of thread poking through the bigger holesaw, which you can just about thread on the smaller size.

    [​IMG]

    Trickier to separate after if the 'anti-jam' pins won't reach the front holesaw, so put some grease where the holesaws contact each other.
     
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  4. mhar
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    mhar Electrician's Arms

    Location:
    devon
    I just get something like a bit of 5-10mm ply and make the required size hole in it and use it as a template (holding it in place whilst drilling the new hole
     
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  5. Murdoch
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    Murdoch Electrician's Arms

    Location:
    Woking
    My "Old" Arbor will allow you to use 2 hole saws ...

    Have you tried the one you have?
     
    • Like Like x 1
  6. Midwest
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    Midwest Electrician's Arms

    Location:
    Oxfordshire
    Thanks, I'll have a look. Both me arbours are ancient, circa 1980 and one is jammed with a hole saw :oops:
     
  7. Jim90
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    Jim90 Jim1990

    Location:
    Norwich
    Drilling 25mm holes and the 20mm knockout comes out of a box and you have to put like a reel of tape around a 20mm wholesaw to fit snuggly in a 25mm wholesaw!
    Those were the days. Too poor to buy cone cutters!
     
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  8. 123
    Online

    123 Electrician's Arms

    CK also do one, I think it's slightly cheaper, here
     
  9. sam400
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    sam400 Regular EF Member

    Location:
    sussex
    Oops arbors are brilliant ,well worth having in your holesaw set. It's got me out of bother a few times now.

    Sam
     
  10. Midwest
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    Midwest Electrician's Arms

    Location:
    Oxfordshire
    How do these arbours fit into your existing arbour or do they? Looking at the Starrett web site, they seem to have different shanks for different arbours.
     
  11. 123
    Online

    123 Electrician's Arms

    They replace the 6mm pilot bit
     
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