This has been beaten to death here and elsewhere.
Google this newsgroup for 'scarph' or 'scarphing'.
Also search the boatbuilding section of the WoodenBoat forum HERE
There are many different ways to cut scarphs. For spar scarphs, jigs that create a ramp for a long handplane might be the easiest way.
For spars, you want at least 12:1 taper.

"Bert van den Berg" wrote in message ...
I have seen wood scarfed for wood mast construction where there is a long
joint made by overlapping two pieces of tapered wood. Can anyone tell me
how you physically create the long tapered joint? I have been thinking of
using a thicknesser with multi passes.

Regards,

Bert van den Berg

I have built a jig with a 1:12 taper. A good stiff back plank and two
planed and sanded tapered ramps securely mounted to the back piece to
make a valley for the thing to be scarfed. I then have a sled that I
mount a router on. The scarfs are very accurate and can be repeated lots
of times if necessary. So a few practices on scrap wood are easy to get
the best technique before you attack your very expensive good wood.

I have been very pleased with the results although it is a lot of effort
to build the jig. I have used it a lot for various jobs including a
rubbing strip involving 4 pieces of wood.

Steve
Jim Conlin wrote:
This has been beaten to death here and elsewhere.
Google this newsgroup for 'scarph' or 'scarphing'.
Also search the boatbuilding section of the WoodenBoat forum HERE
http://www.woodenboat-ubb.com/cgi-bin/UBB/ultimatebb.cgi?ubb=search;search_forum=1
There are many different ways to cut scarphs. For spar scarphs, jigs
that create a ramp for a long handplane might be the easiest way.
For spars, you want at least 12:1 taper.

"Bert van den Berg" wrote
in message ...
I have seen wood scarfed for wood mast construction where there is a long
joint made by overlapping two pieces of tapered wood. Can anyone tell me
how you physically create the long tapered joint? I have been
thinking of
using a thicknesser with multi passes.

Regards,

Bert van den Berg