ROHM Revolving tailstock centres - Manual (Page 16)

Failures and their causes
Trouble: Centre is too hot
Cause:
a) The maximum value rendered in the speed load table is exceeded.
b) Viscosity of the lubricant is too high.
Trouble: Centre is burned down
Cause:
a) The centre hole of the work piece is too small relative to the live
centre.
b) The bearing resistance is too high due to unsuitable lubricant.
c) The live centre is braked down or even stopped due to contact with
holding device or chips.
Trouble: Rupture of centre
Cause:
a) The centre borehole is not in true alignment with the axle.
b) The radial load is too high.
c) The work piece weight is exceeded or the work piece is eccentrically
arranged.
d) The centre borehole is not deep enough.
e) The tailstock is not in true alignment with the main spindle axle.
19771-k001-001 19.07.2005 13:58 Uhr Seite 16