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  1. #1

    pre drill and countersink holes

    Hello All,

    is there a rule to choose the right drill bit for pre drilling and countersink?
    It's annoying to always put a drill bit in the drill, than swap it for the little
    bit to countersink and than put the scew in.

    So I wanted to by one of those bits that do both pre drilling and countersink in one,
    however this means I would have to buy multiple size depending what crew I need,

    so I was wondering if there is a rule for it or can I use a 3mm drill bit or something similar
    everytime independently on the screw size?

    Thanks

  2. #2
    Geppetto look in this catalog at page 66 67 http://www.hellertools.com/nl/taxonomy/term/7
    Pre drilling 3 mm is at least a screw dia. of 4mm or better 4.5 or 5mm. So I think you have to play with the drillingdepth of the countersink bit.
    There are others like makita http://www.toolstop.co.uk/makita-p-5...sink-set-p5232
    I see you live in huizen n.h. that is near bussum so we are kind of neighbors.

  3. #3
    Citaat Oorspronkelijk geplaatst door Geppetto Bekijk Berichten
    Hello All,
    so I was wondering if there is a rule for it or can I use a 3mm drill bit or something similar
    everytime independently on the screw size?
    hey Gepetto...

    in most cases i use the rule of thumb that i pre drill with a 1mm thinner than the screw.

    so 8mm screw i predrill with 7mm

    but it depends which material you are drilling and for what purpose. In MDF close to the edge i predrill with .5 smaller, in real wood making constructions the difference between screw and predrill bit can be bigger.

 

 

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