Figure 2-2. Measuring belt speed on a sanding machine, using Type 1531 Strobotac ond Type 1531-P3 Linear Speed Wheel.
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Figure 2-2. Measuring belt speed on a sanding machine, using Type
1531 Strobotac ond Type 1531-P3 Linear Speed Wheel.
stroboscope is then adjusted to produce the proper stationary image. The
linear speed of the moving object is determined from the stroboscope
The range of surface speeda that can be measured with the large
wheel is 50 to 12,500 FPM (feet per minute); with the small wheel the
range is 10 to 2500 FPM. Press the appropriate wheel against the
moving surface just firmly enough to prevent any slipping.
The large wheel is suitable for the measurement of relatively high
linear speeds, It has a circumference of 0.5 foot and is marked "SINGLE
IMAGE, FPM = RPM ÷ 2". Adjust the stroboscope dial to the highest set-
ing that produces a single stationary image. (NOTE: To check the dial
setting, switch the stroboscope to the next higher range. If the original
setting was correct, six images will now be produced.) The linear speed
of the moving surface in feet per minute is the stroboscope dial reading
divided by 2.
The small wheel, suitable for the measurement of relatively slow
linear speeds, has a circumference of 0.2 foot and is marked "2 IMAGES,
RPM ÷ 10". Adjust the stroboscope dial so that a double stationary image
is obtained. The image will appear as a full-diameter line on the wheel,
(NOTE: To check the dial setting, turn the stroboscope dial to half of its
double -image value. If the original setting was correct, a single image
will now be produced.) The linear speed of the moving surface in feet
per minute is the stroboscope dial reading divided by 10.
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