Logosol M8 - Manual (Page 8)

Temporary board: Cut a board into
length, approx. ¾”4 (20x100 mm).
The board should be 80 mm shorter
than the diameter of the bottom (i.e.
192 cm).
With the help of the compass, measure
where the centre of the bottom is to
be. Make sure that the outermost (and
shortest) boards will be of the same
width, and that they will be at least 60
mm wide. This means that the centre
nail of the compass should be placed
either centred on a bottom board, or
between two boards.
Use a pencil to draw a line that goes
perpendicular to the boards straight
across the whole bottom, and another
line that is half a metre long and
goes over the centre in line with the
boards.
Laying out the bottom boards
Lay out two planks on a level surface.
Lay out the tongued and grooved
boards on the two planks. The future
upper side should face downwards.
Use the compass to check if the
boards are long enough and have a
safety margin of at least 6 cm in all
directions. Hammer them together
properly. Use a stop on one side
to facilitate this operation. To avoid
damaging the tongue on the bottom
boards, you can use a remaining
piece of the tongued and grooved
boards as a buffer between the mallet
(or hammer) and the bottom boards.
Using the compass, check that the
boards lie within the circle. If not,
hammer them into place. Check again
with the compass when you have put
half the bottom together, so that you
know exactly how many boards you
will need (concerning the outermost
boards, see below).