After that, the error starts to increase (except for the three-point method).
We solve this equation with the three-point method (k = 3, m = 1) and the four-point method (k = 4, m = 2).
Indeed, the efficiency index [12.sup.1/4] [approximately equal to] 1.861 of the proposed three-step twelfth-order method with memory is higher than the efficiency index, [6.sup.1/3] [approximately equal to] 1.817 of (19), [8.sup.1/4] = 1.682 of the optimal three-point method
(11), and [4.sup.1/3] = 1.587 of (6).
To this end, consider the following three-point method
(without the index n):
On-machine roundness measurement of cylindrical workpieces by the combined three-point method
. Measurement, Vol.
This measurement strategy is called the three-point method
. When the measurement is performed for a rotating workpiece, the measuring signal m(o) is affected not only by the form deviation s(o) but also by the mutual alignment of the support points and the location of the sensor.
The four-point measuring method uses four sensors in a combination of a three-point method
and a two-point method .
The comparisons between the three-point method
and the single-point method are well discussed by Lowell and Shield (ref.
Then, the specimens where cut from each plate for the flexural test (three-point method
Then, the specimens were cut from the plates for the flexural test (three-point method
The DFT-G3P method (Discrete Fourier Transform Generalized Three-Point Method
) is based on sequential three point method for profile roundness measure (Gao & Kiyono, 1997).
are very accurate and can reach high accuracy in some cases even after 1 to 2 iterations.