making big holes in oak sleepers

[happyhero]

Hi can anyone suggest a way that I can make holes in sleepers big enough and perfect enough to be able to bang 3"x3" fence posts into, I want to try and get them cut neat and tidy and right through the sleeper, and hopefully quite snug.

I have thought of different ways of doing it but nothing that is that simple, I would have thought there must be a easier or correct method of doing this.

Any ideas or help appreciated.

 

[EddieM]

chainsaw mortiser? sort of like one of these or these

 

[squowse]

auger or flat drill bit. armeg wood beaver or irwin speedbor are good on power drills.
mark out your square hole - drill the corners and along the sides, finish off with a hammer and chisel.
small diameter bit - lots of drilling not much chiselling.
large diameter bit - vice versa.

 

[mattylad]

Another job for mr reciprocating saw

 

[squowse]

Another job for mr reciprocating saw

maybe but sleepers are usually 150mm thick. i think a reciprocating saw would struggle in oak even if you had a long enough blade.