Humboldt HM-2800 Multi-Speed Load Frame - Manual (Page 7)

Load Ring
When a load ring is used it can be attached directly to the cross-beam
using the 3/4-16 x 3” long bolt.
Maximum Load
This Compression and Testing Machine is rated a 10,000 lbf (44kn).
Accuracy of Platen Speeds
The indicated speeds are based on zero load conditions and will be
maintained within +/- 5%. The actual motor speed will be maintained
to +/- 1%. These are not closing gap speeds.
The speeds used in the various test are, in fact, the closing gap speed,
i.e., the distance between the cross-beam and the platen. These
closing gap speeds will be dependent on the stiffness of the sample
being tested and the compressibility of any load measuring device
(such as the load ring). At high loads, some machine stretch may occur.
The test speeds used should, therefore, take into account these factors.
Maintenance
Both the jack unit and the gearbox are packed with grease and do
not normally require further attention. The machine can generally be
maintained by keeping it clean, and if adjusting the crosshead beam,
lightly oiling the exposed threads.
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