I have five 150mm x 150mm posts, (pressure impregnated soft wood), and these are structural posts for a car port & garage.
The fixing for these is that there are base plates fixed to concrete, proving a 200mm T section steel upright onto which these posts slide, and they are then are through bolted to it.
Pic on
The steel of the blade that they slide onto is 8mm plate which I have had galvanised ... just measured and it's 'about' 8.5mm thick on average.
So at one end of each post I need to cut a slot right though the post (i.e.from one face to another on the centre line), either 8.5mm thick or perhaps 9mm. My only thought so far are to use a router, cutting from both sides ... but it's still asking a lot ... at least 75mm depth of cut and only 9mm wide. I have a hand held router.
Any other suggestions ?
It needs to be neat, straight, and square ended
Rick