２２
NOTE:
In some cases, if the abrasive strip stretches, it may be
necessary
to
readjust/reposition the abrasive clip points on the abrasive strip. Ensure the
tension remains positive on the abrasive strip during extended use.
ABRASIVE GRIT SELECTION
THE SANDING PROCESS
Smoothing wood, or sanding, is the process of making finer and finer
scratches until they become so small they are no longer visible to the human
eye.
The grit size of the sandpaper designates the coarseness of the abrasive. The
lower the grit number, the coarser the sandpaper and the larger the scratches
made to the surface. Thus 36 grit sandpaper is coarser (bigger scratches)
than 60 grit sandpaper, and 60 grit is coarser than 80 grit, and so on. With
coarser grit papers such as 36 and 60 grit, very aggressive material removal
and surface scratching occurs, whereas with 220 grit, very little surface
material is removed and a buffed like look begins to appear.
GRIT SELECTION
Typically, you begin sanding with a coarse grit and progressively work through
finer grits until the desired finish or thickness is achieved. Choosing which grit
to begin sanding with is a subjective judgment based on your assessment of
stock condition (rough, smooth, etc.), thickness, hard/soft wood, and the
desired outcome. Below are some general guidelines regarding sanding grits.
(Pre-cut strips in each listed grit size are available distributors and Factory
Service Centers.)
GRIT USES and ABRASIVE CHARACTERISTICS
36
Very aggressive: maximum stock removal, glue removal, abrasive
planning
, removing “cup”, paint
removal
60
Medium aggressive: stock removal, surfacing, glue removal, end grain
surfacing
80
Medium aggressive: stock removal, surfacing, glue removal, end grain
smoothing, planer mark removal
100
Medium: light surfacing, end grain smoothing, planr nark removal
120
Medium fine: light surfacing and stock removal, thin stock
dimensioning
150
Fine: minimum stock removal, finish sanding surface preparation, thin
stock dimensioning
180
Fine: finish sanding
220
Very fine: finish sanding
Summary of Contents for MM3156
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