A cost-effective, accurate machine for testing the torsional strength of sheep long bones.
A cost-effective torsional testing machine for sheep long bones was constructed. The machine was fabricated on a disused standard turning lathe. The angular speed used was 6.5 degrees/s. A precision amplifier using modern low-noise, low-drift operational amplifiers was developed. The maximum torsional load was 250 Nm, the sensitivity 0.5 Nm and the total machine inaccuracy less than 1.0%. The standard error of torsional testing was 3.0% when seven pairs of intact sheep tibiae were tested.
Jämsä
T
T
Technical Services Department, Faculty of Medicine, University of Oulu, Finland.
Jalovaara
P
P
D000818:Animals; D001696:Biomechanical Phenomena; D001703:Biophysics / Q000191:economics / Q000295:instrumentation* / Q000706:statistics & numerical data; D001842:Bone and Bones / Q000502:physiology*; D003362:Cost-Benefit Analysis; D004582:Electronics, Medical / Q000295:instrumentation; D004867:Equipment Design; D066298:In Vitro Techniques; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D012756:Sheep; D013314:Stress, Mechanical