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9.4.6 Measuring of thread wear in worm wheel
Spindle
SHM
Point of measuring
SHM distance
Figur 15. Wear in worm wheell
All jacks with SHM (see ”Safety Nut (SHM)” on page 15) are marked with dimension value between SHM and
SHM distance that is valid at delivery. The information is stamped onto the product sign with the following
format: “SHMx.x” where x.x is the actual dimension in mm with one decimal.
NOTE: TEST FROM OUR FACTORY OR OUR SERVICE WORKSHOPS!
Note that the spindle (1) at the Benzler measurement is loaded (with appr. 500 to 1000 N)
in the direction that the SHM shall secure and that (2) the SHM is displaced as much as
possible from the SHM distance with mode- rate force (or enough force to get separation).
NOTE: THE WEAR MUST BE CHECKED REGULARLY!
For monitoring of change of worm wheel wear in thread - the same procedure must be
applied to get compara- ble values! If necessary, contact Benzlers service department.
NOTE: ABOUT WEAR DISTANCE!
The values at delivery can differ between individuals (dimension = 25 - 37% of thread pitch).
Maximum allowed wear distance is 25% of thread pitch.
