HAMAR LASER STEALTH Series, Общее руководство по обучению

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Tramming Method for Hard-to-Reach Rolls
1. There are times when the side of the roll is impossible to reach with the target. In this case, we can attach
a tram bar to the end of the shaft and put the A-1519-2.4ZB Target on it. Rotate the shaft to 12:00 and
zero it in Read15. Then rotate it to 6:00 and the deviation is a measure of how out of level the roll is
relative to earth level.
2.
For the horizontal parallelism, rotate the shaft to 3:00 and zero it. Then rotate it to 9:00 and this gives you a
measure of how out of parallel the roll is
relative
to the
reference roll
.
Note: If the tram bar radius is 18 in. (500 mm) long and the difference in the reading is .009 in. (0.23 mm), then that
equals a parallelism error of .003 in/ft (0.25 mm/m). If the roll is 15 ft. (4.5 m) long, then this means the far end of the
roll is out by .045 in. (1.14 mm) relative to the reference roll.