Hello Luis, in the EAA "HOW TO" series book "Aircraft Building Techniques
WOOD" page 24 show plans to build a hand held scarfing sander using a drill, a
small sanding drum (available from Sears) and scrap plywood.
I have made scarfs on plywood for wooden boats using a small had held plane ,
it takes a very sharp blade, a nice flat work bench, a straight edge to check
your progress and lots of patience.
If you are using the newer glues such as epoxy then I don't think that the
warning about not sanding the joints to be glued is as critical, you can use a
scraper to go over the sanded joint if it makes you sleep better.
"MotorcycleShopper.com" <firstname.lastname@example.org> wrote:
I've been making practice scarf joints without a lot of success.
First I made a jig where I placed a belt sander upside-down on a bench and
built a table and guide fence on it. That did not yield acceptable results
as I had no way to keep constant pressure on the plywood.