The top collar on the Lower Anchor Pin should be used to secure the lower grip in place.
Use the small spanner wrench provided to tighten the collar upwards against the bottom
of the lower grip.
Extreme care must be taken when maneuvering the crosshead, particularly
when low
force load cells are being used as they can easily be damaged even at moderate
speeds.
As an additional precaution during compression testing the lower (hardware) limit
stop should be set so that the compression plates cannot come together either
during or after a test.
5.4 LIMIT
STOPS
The CS Force Tester is fitted with two mechanically activated limit stops. These can be used
as extra protection to stop load cells, grips or fixtures coming into contact. The upper one
can be used to back up the test upper limit. Activating a limit stop will result in the machine
stopping.
To adjust the lower limit stop, first loosen the lower limit stop screw and move the stop to the
bottom of its travel in the slot. Drive the moving crosshead to the lowest position that it may
go to safely, without damaging any fitted grips or fixtures. When this position has been
reached, drive the crosshead up by 3mm (0.125 inch). Move the lower adjustable limit
stop
up
until it stops against the crosshead actuator within the column. Tighten the screw in this
position. Ensure the screws are free to move vertically to actuate the switches.
To adjust the top limit stop, loosen the upper limit stop screw and move the screw to the top
of its travel and tighten the screw temporarily in this position. Drive the moving crosshead to
the highest position it may go to safely, without damaging any fitted grips or fixtures. When
this position has been reached, drive the crosshead down by 3mm (0.125 inch). Loosen the
upper limit stop screw and move the screw down to the limit stop cross head actuator and
tighten the screw in this position. Once again, ensure the screws are free to move
vertically to
actuate the switches.
CS User Manual
41
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