Logosol M8 - Manual (Page 12)

Two circles are to be carved around
the entire circumference of the bottom:
one circle 10 mm from the edge, and
the other 20 mm. Start by moving the
outermost compass nail 10 mm further
in on the compass. Measure the
distance (990 mm) and bend the nail if
necessary. Carve the circle. Move the
nail another 10 mm further in on the
compass (980 mm between the nails)
and carve the other circle (20 mm
from the edge) and around the entire
circumference of the bottom.
Fixing boards
Lay out four 22X100 mm boards,
preferably heartwood, on the bottom
boards. The two in the middle should
have a space of c/c 400 between
them, and the two outer boards should
lie centred between the middle boards
and the edge of the bottom. Measure
against the temporary board to make
sure that the fixing boards become
parallel. Draw with a pencil along both
sides of the four fixing boards so that
you get lines on the bottom boards.
Use the compass to carve the 20 mm
line on the fixing boards. Remove
the fixing boards and saw along the
carved line.
The underframe
The fixing boards are cut into length along
the carved line.