Trouble-shooting
Reasons for wrong
measurements on an
M7 sawmill:
A. Incorrect adjustment
or set-up
B. Cutting equipment
misfunction
C. Tensions in the
wood
A. Checking the M7
1. Check that all four legs
stand rmly and that the feet
do not sink into the ground
when a heavy log is loaded.
2. Sight over the log
beds and cross beam to
check that the sawmill stands
straight. Check both loaded
and unloaded.
3. Use a set square to
check very carefully that the
guide rail is at an exact 90°
angle to the long legs. Even
a small deviation can lead to
large measurement errors.
4. S e t t h e d i s t a n c e
between log bed and guide
bar so that it is exactly the
same on both log beds. Make
sure the guide bar and the log
beds are fully parallel. Use
the setting block included
with the machine.
5. Check that the guide
rail is absolutely straight by
sighting along the guide rail
or by running a line over the
guide rail and using nails or
something similar as spacers
between the line and the
guide rail.
Take special note to loosen
the struts towards the middle
of the guide rail before
checking the straightness.
If support legs are used for
the guide rail, it is essential
that they stand on some rigid
surface such as a pole driven
into the ground.
6. Check that the guide
bar is straight in relation to the
sawing direction by placing
a 1.5 m (5 ft) strip of wood
on the guide bar without the
chain. Sight across the strip
to make sure it is parallel to
the guide rail.
Even factory-new guide bar
mounts can be out of true.
This is discovered if the
parallel relation to the log bed
changes when the guide bar
is turned. A bent guide bar is
most easily straightened by
being pressed up or down
while the saw is mounted
on the sawmill (see page
24). An out of true mount
is corrected for by placing
washers between the carriage
plate and the slide rail.
Non-parallel guide bars or
mounts will most often occur
when chainsaws other than
Stihl are used.
7. The set-up of the M7
can be checked by placing a
board with maximum length
on the log beds. First trim off
a narrow strip from one side
of the board. Then turn it, set
both log beds to the same
height and remove a similar
strip. Now measure the width
of the board carefully. If the
board is not the same width
along its entire length it can
mean that the log beds are
incorrectly set or that the
guide rail is crooked. It is
also possible that the guide
rail has been depressed by
the weight of the log. When
a heavy cutting unit is used,
this problem can even occur
if the support legs are not on
a rigid surface. If a chain-saw
is used the same thing can
happen if you extend the
guide rail more than 0.5 m
(1.5 ft) without adding support
legs.
B. Checking the
cutting equipment
The guide bar must not cut
upwards or downwards during
sawing. This is most obvious
when the guide bar leaves the
log. If the guide bar does not
simply oat out of the log but
springs up or down, problems
can arise. In such cases there
can be something wrong with
the guide bar or the chain.
Reasons for misfunction in
the cutting equipment:
1. One frequent reason
for problems when using the
M7 is that the chain is dull
(see page 30).
2. The chain may be
damaged on one side, such
as by metal objects in the log.
The chain may still cut, but
pulls up or down (see page
31).
3. The chain may have
been led wrong. The cutters
may be filed less on one
28
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