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Trapezoidal screw drives TGT
Trapezoidal screw drives
TGT
1. Installation
Trapezoidal screw drives must be aligned
carefully during installation – if suitable
measuring equipment is not available, the
screw drive should be turned through its
entire length by hand before the drive unit
is attached. Variations in the amount of
force required and/or marks on the exter-
nal diameter of the screw indicate align-
ment errors between the spindle axis and
guide. In this case, the relevant mounting
bolts should first be loosened and the
screw drive should be turned through by
hand. If the amount of force required is
now constant throughout, the appropri-
ate components should be aligned, other-
wise the alignment error should be
localised by loosening further mounting
bolts.
2. Cover
By virtue of their design, trapezoidal screw
drives are less sensitive to dirt than ball
screw drives, particularly at low speeds
(manual operation). Motion drives, howev-
er, especially with plastic nuts, require pro-
tection against dirt in the same way as ball
screw drives.
3. Lubrication
3.1 Oil lubrication
Used only in special cases for trapezoidal
screw drives.
3.2 Grease lubrication
The usual lubrication method for trape-
zoidal screw drives. Lubrication intervals
are governed by operating conditions; it is
advisable to clean the screw before greas-
ing especially when heavy-duty lubricating
machines are used.
Grease types: Roller bearing grease with no
solid lubricant content.
4. Operating temperature
This depends on the type of nut used, the
lubrication conditions and the user's
requirements. Please consult us in the
case of temperatures above 100°C (plastic
nuts 70°C).
5. Wear
This can be checked manually: if the axial
backlash with single-start screw drive is
more than 1/4 of the lead, the nut should
be replaced.
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