The in vivo precision of the machine for lumbar spine, FN and total hip region was 1.2, 1.5 and 1.5%, respectively.
The in vivo precision of the machine was 0.60% for the femoral neck and 0.66% for the lumbar spine.
Much of the controversy seems to revolve around ballot cards designed to be perforated by a stylus but which, either through error or deliberate omission, have not been perforated with sufficient precision for a machine to count them.
As a result, there would be fewer requirements in degree of precision for stage machining and assembly.
"The Case for the Precision Timed (PRET) Machine".
Thus, accurate periodic checks and calibrations of the rotary axes are important for improving the machining precision.
In this paper, a new type of electronically controlled winding machine is proposed, and a design of a high-precision tracking control system for the winding machine is presented.
An et al. [5] studied the influence of stability of aerostatic bearing spindles on the machining precision of ultra-precision fly-cutting machines used for processing large diameter optical components.
Conventionally used linear or circular interpolators are undesirable for the precision machining of 3D free-form surfaces for the following reasons: the transmission errors due to the huge number of point data, discontinuity of curve segmentation, and unsmooth motion speed.
However, smaller time steps allowed more energy accuracy on the grape, around 10−11, whereas for the GPU machine precision saturates around 10−6 For N ≳ 106 the GeForce 8800GTX was about 20 times faster than the host computer.
THE recent introduction of the "Watts" jig borer microscope provides a valuable optical accessory for use with high-precision machine tools such as jig borers, and tool-room milling machines, Its purpose is to enable the axis of the machine to be accurately located in relation to a datum mark on the work-piece.
