pre drill and countersink holes

Geppetto · 2 jul 2014

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

Wim Kluck · 2 jul 2014

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-51954-4-piece-fast-change-countersink-set-p5232
I see you live in huizen n.h. that is near bussum so we are kind of neighbors.

MaartenS · 3 jul 2014

Geppetto zei:
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.

Zoeken

Zoeken

pre drill and countersink holes

Geppetto

Actieve deelnemer

Wim Kluck

Oud hout

MaartenS

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