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MEASURING
WHEEL
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Measuring Do's and Donts
Pick the surface that you will measure on, use hard
surface if possible (the harder and smoother the surface the more
accurate the measurement).
Always walk in a straight a line as possible as the wheel will measure
all the curves and bumps.
Grass (lawn), thick carpets and soft sand will never give an accurate
measurement as these surfaces tend to retard the rotation of the wheel
and your measurement is likely to be short.
In the event of grass, it is found that depending on the position of
the sun at the time of measurement, the reading will change, as the nap
of the grass is affected by the position of the sun. The nap of the
grass will affect the measurement.
The same occurs on thick pile carpet, the direction of the pile has a
influence over the measurement.
Checking the Belt for Slip
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Align
any mark on the wheel with any point on the fork, so that the wheel can
return to the same point after spinning. Number 1.
Zero the counter. Number 2.
Now spin the wheel as many times as you like.
Stop the wheel and return it to the original mark that was lined up
previously. Number 1.
The counter will read any whole number but the white display with the
black numbers on the right-hand-side of the counter must read -- 0 --.
Number 3.
This is only on Roto-Sure 1000, Classique and Econo ranges, the
Roto-Sure 500 will read a -- 0 -- or a -- 5 --.
In the event where the counter does not read as indicated, there is
dirt stuck in the timing belt.
Remove the belt cover and clean out any dirt lodged between the teeth
of the belt as well as the pulley.
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How to Measure
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Wall to Wall Measurement
Place your Roto-Sure on the ground, with the back of the wheel up
againts the wall.
Proceed to move in a straight line to the next wall. Stop the wheel up
against the wall and record the reading on the counter.
The reading must now be added to the diameter of the wheel.
The Roto-Sure 1000 has a wheel diameter of 318mm as indicated on the
side f the tyre.
The Roto-Sure 500 wheel diameter is 159mm indicated on the tyre.
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Wall to Point Measurement
Place your Roto-Sure on the ground, with the back of the wheel up
against the wall.
Proceed to move in a straight line to the next wall. Stop with the
lowest point of the wheel over the mark.
Record the reading on the counter, then add it to the radius of the
wheel.
The Roto-Sure Classique and 1000 have a radius of 159mm, the Roto-Sure
500 has a radius of 80mm.
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Point to Point Measurement
Place your Roto-Sure on the starting point of the measurement with the
lowest point of the wheel on the mark.
Proceed to the next mark at the end of the measurement.
Record the reading on the counter. This is the final measurement
between the two points.
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