Needed to drill some holes through joists for a lump of 6mm T & E for a new shower. My trusty flat bits struggle through the 200 year old Douglas fir so thought I'd treat myself to some shiny new bits- these puppies http://www.toolstation.com/shop/Pow.../sd1120/Quad+Cutter+Wood+Drill+Bit+Set/p55369 (I've use the 14mm version very successfully previously).
But then it all went poo- using a 90 degree chuck (so the holes are horizontal so the cables pull through easily and the hole actually is on the centreline) I couldn't hold the drill or the chuck thing still cos the torque needed by the bit as it pulled itself into the wood was too high.
Scratches head.Thinks-these bits have a hex end that look as if they'll fit my impact driver, which is short enough to sit between the joists and drill level. It'll never work but let's give it a go.
So tried it. Very noisy but works very very well- nice clean horizontal hole, no push on the drill needed, the things pull themselves into the wood. No idea how long the bits will last subjected to this abuse but what a result!
Just thought I'd share
But then it all went poo- using a 90 degree chuck (so the holes are horizontal so the cables pull through easily and the hole actually is on the centreline) I couldn't hold the drill or the chuck thing still cos the torque needed by the bit as it pulled itself into the wood was too high.
Scratches head.Thinks-these bits have a hex end that look as if they'll fit my impact driver, which is short enough to sit between the joists and drill level. It'll never work but let's give it a go.
So tried it. Very noisy but works very very well- nice clean horizontal hole, no push on the drill needed, the things pull themselves into the wood. No idea how long the bits will last subjected to this abuse but what a result!
Just thought I'd share