On 24/07/2018 15:15, wrote:

I have a large shed with 6" x 3" timber uprights resting on a stub block
wall. The bottom 2-3 feet of the posts is rotten so I want to splice-in
some new timber. I can't think how to cut a decent lap joint in the
bottom end of the remaining upright so I'm tempted to butt join the
timber and add steel plates (fish plates?) on each side - at a guess
these would be around 150 wide 450 long and a few mm thick.

Suggestions welcomed for how to cut a lap joint on the bottom of a bit
of timber that's waggling in the breeze, or for a source of suitable
steel plates.

A scarf joint would be easiest - just a long straight cut on the
diagonal with a handsaw - match the same angle on the new bit, then glue
up and screw through the face into the joint a couple of times.

If you want a half lap, then as you said - repeated cuts every few mm
with a circular saw, then knock out the waste, and plane/chisel flat.


--
Cheers,

John.

/================================================== ===============\
| Internode Ltd - http://www.internode.co.uk |
|-----------------------------------------------------------------|
| John Rumm - john(at)internode(dot)co(dot)uk |
\================================================= ================/