Mold-Masters Hot Runner - 13.5 Check for Misalignment

13.5 Check for Misalignment
During belt installation and drive alignment, two types of misalignment can
occur:
• Parallel misalignment - is when driveR and driveN shafts are parallel, but
the two pulleys lie in di󰀨erent planes.
• Angular misalignment - is when the two shafts are not parallel.
A eeting angle is the angle at which the belt enters and exits the pulleys, and
it equals the sum of the parallel and angular misalignments.
Any degree of pulley misalignment will result in some reduction of belt
life, which is not accounted for in the normal drive design procedure.
Misalignment of all positive belt drives should not exceed 1/4˚ or 5 mm per
metre of centre distance.
Misalignment should be checked with a good straight edge tool. The tool
should be applied from driveR to driveN and from driveN to driveR so that the
e󰀨ect of parallel and angular misalignment is taken into account.
Parallel misalignment
Angular misalignment
eeting angle
eeting angle
driveR
driveR
driveN
driveN
Figure 13-6 Misalignment check
13-15E-DRIVE
Hot Runner User Manual
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