Sawmill Operation
Blade Height Scale
Sawmill Operation
LX25 4/8/21
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4
THE QUARTER SCALE
The quarter scale has four sets of marks. Each set represents a specific lumber thick
-
ness. Saw kerf and shrinkage allowance are included, but actual board thickness will vary
slightly depending on blade thickness and tooth set.
To use the quarter scale, look at the blade height indicator.
Position the quarter scale over the inch scale. Align one of the quarter scale marks with
the horizontal line on the indicator.
Make a trim cut. When you return the mast for a second cut, lower the mast to the next
mark on the scale. This mark shows where the blade should be positioned to cut a certain
thickness of lumber, without having to measure on the inch scale.
Example:
You want to cut 1" (25 mm) (4/4) random width boards from a log.
a.
Position the blade for the first cut.
b.
Position the magnetic quarter scale so a 4/4 mark is aligned with the line on the
indicator.
c.
Make a trim cut.
d.
Return the mast for the second cut.
e.
Lower the blade so the indicator is aligned with the next 4/4 mark on the quarter
scale.
f.
Turn the log 90 degrees and repeat.
Standard Quarter Scale
Scale
Actual Board Thickness
3/4
3/4” (19 mm)
4/4
1" (25 mm)
5/4
1 1/4" (32 mm)
6/4
1 1/2" (38 mm)
8/4
2" (51 mm)
TABLE 4-1