Power Jacks C-Series - Manual (Page 11)

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4
Installation
4.2 General Instructions for fitting detachable ends on lead screws
In most circumstances the screw jack is delivered with the required end fitting assembled to the unit.
4.2.1 It is important that the detachable ends are securely fixed to the lead screws and the following
procedure should be adhered to.
4.2.2 Thread the detachable end on to the lead screw and tighten up as hard as possible without
damaging the components.
4.2.3 Select a twist drill which is a free fit in the tapped holes of the detachable end. Using these holes
as a drill guide, drill dimple only into the lead screw. Clean out swarf and remove detachable
end. Select another drill which matches the set screw diameter and, using the drill dimples as
a guide, drill into the lead screw a full diameter depth of 1mm below the root diameter of the
threads. Refit detachable end.
4.2.4 Fit the knurled point set screws (supplied with detachable ends) firmly in place ensuring that
point of set screws make contact with bottom of drill dimples. Secure the set screws with
chemical thread locking compound (e.g. Loctite).
4.2.5 If screw jacks with keyed lead screws are involved, and it is required to
line up the clevis flats or top plate holes, etc., in a fixed relationship
to the worm shaft centre line, it will be necessary to face the underside
of the detachable end to obtain the required relationship. This operation
should be done carefully as only a few hundredths of a mm (thousands
of an inch) removed from the attachment is equivalent to a fair amount
of rotational movement. After the correct relationship has been obtained
with the attachment firmly tightened up, proceed to install the screw jack
in accordance with this manual.
1mm deep
drill dimples