HBM TB1A Notice De Montage page 11

TB1A
2. If you cannot achieve the requisite alignment accuracy, use non interacting
couplings.
3. Keep the weight of the shaft sections acting on the torque measuring disc
as low as possible.
Depending on the design of the test bench, decoupling measures with
torsionally stiff but pliable torsion bars may be necessary.
Different stiffness conditions
If the stiffness conditions in the shaft run (near the torque measuring disc)
differ to the conditions during calibration in the HBM normal measuring device,
this can change the torque introduction to the torque measuring disc.
Countermeasures:
1. Keep strictly to the prescribed fastening bolt tightening torques.
2. Use high strength or hardened adaptation components, especially close to
the torque introductions and torque outlets of the torque measuring disc.
Asymmetrical torque distributions
Asymmetrical (axially uneven) torque distribution in the shaft run can lead to
deflections, that then cause parasitic loadings.
Countermeasures:
1. Use all the available screw connections for the mounting.
2. Keep strictly to the prescribed fastening bolt tightening torques.
3. Avoid making unnecessary bore holes in the adaptation flanges.
4. Use flange surfaces that are clean, flat and as polished as possible.
5. Avoid having torque introductions and outlets right on the outside diameter
of the measuring disc.
6. Use adaptation flanges with sufficiently large clearance bores to stop the
screws locking up.
A0162 7.0 en/de/fr
11
HBM