Laguna Tools MCNC SS2 4X8 6 HP LIQUID COOLED, Руководство пользователя

Страница: 22 / 51

22
Functions of the Spoil Board
1) To protect the vacuum table from damage. The cutter extends only a few
thousandths of an inch past the material thickness. Without the spoil
board, the cutters could damage the surface of the vacuum table.
2) To transfer the vacuum from the table to the job. This means that the spoil
board has to be porous to allow air flow to the panel material. Low cost
MDF has proven to be a very good material for this purpose.
3) To provide a “zero setup” environment for processing panel products.
Spoil Board Preparation
When MDF is sourced for the spoil board, it should be no thinner than 3/4
inch. Contrary to what might seem logical, the thicker the MDF the better the
suction that is created. “Flow-through” fixturing maintains a careful balance
between air flow through the MDF and the infiltration that occurs as the kerfs
are machined. It is not recommended that the spoil board material be is
thicker than 1 inch.
The MDF manufacturing process causes the top and bottom surfaces of the
material to be compressed. It is necessary, therefore, to remove the
compacted top and bottom surfaces. This process is termed “fly-cutting” and
requires the removal of approximately 0.060" from each surface. This
process also ensures that the machining plane and spoil board surface are
parallel.
The spoil board edges are also very porous, and sealing them can improve
the part holding ability. Hard candle wax is an excellent product for sealing the
spoil board edges because it contains no water and is very easy to apply.
Never use a water-based product to seal the edges of the board, as this will
make the board expand and become unsuitable for use as a spoil board.
Even some glue products contain water and can affect the edges of the spoil
board.
Note: Do not confuse flatness with bow. If the board is bowed, the vacuum
may not pull the board flat on the table. Never try to use a bowed MDF panel
as a spoil board.
Use the following procedure for preparing the spoil board:
1) Cut the spoil board to the size of the table of the machine if necessary.
2) Apply gasketing to the outermost vacuum grooves on the table surface.
3) Place the spoil board on the vacuum table, being careful not to displace
the vacuum gasketing.
4) Prior to placing the spoil board onto the vacuum table, ensure that the
table is clean and free from sawdust and dirt.
5) Turn on the vacuum pump and check for leaks.