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Stipulated the torque required to measure when a metal bone screw is screwed in and out of the standard material to confirm the consistency of the product under test. The constant force is maintained at 11.17N, at a rate of 3r/min, first screwed in 4 turns, then 4 turns out.
Test procedure:
Bone screws are inserted into and removed from a test block (may be predrilled); specifications to ASTM F1839; clamping via specimen grips.
Screw bits are mounted via a quick-acting chuck and the screw is driven at a test speed of 1 to 5 rpm in accordance with the standard. If required, a constant axial preload can be applied.
A minimum of four screw revolutions are required.
Result:
Insertion/removal torque versus angle for the entire duration of the test
Axial load force versus travel for entire duration of test
Insertion Depth
Torque measuring range | 0-5N.m |
Resolution | 0.001N.m |
Torque sensor accuracy | Less than 0.5%F.S. |
Speed accuracy | ±0.01mm/min |
Axial force load cell | 200N/1000N (fulfill axial pull-out test) |
Load cell accuracy | Less than 0.5%F.S. |
Load cell resolution | 0.001N |
Linear displacement sensor range | More than 50m |
Displacement sensor accuracy level | Less than 0.5%F.S. |
Displacement sensor resolution | 0.01mm |
Torsion angle sensor | 99999 degrees |
Torsional angle accuracy | ±0.2 degree |
Torsion speed | 1r/min to 30r/min free adjusting |
Effective travel | 400±10mm (can be increased on demand) |
The coaxiality of the two chucks | ≤ 0.2mm |
Standard Power | 220V, 50HZ, 1 phase, 0.4Kw |
Working system | MS Win10 |