Study of Needles'Points and Bodies (V)

Conditions of Needles Purchased From Manufacturers (IV)

Abstract

In what condition are the needles which are being sold by the manufacturers? In order to answer this question I have thus far twice reported on the conditions of the needle points and bodies and one time on the length and thickness coditions.
Method of Study and Results
I forewarned needle makers that I would publish the results of my investigation upon once more studying the needles. Then using the total of 950 stainless steel 1.6TSUN, No. 3 needles collected, actually measured the lengths and diameters of the needles. Results showed that the overall average length of the 1.6TSUN needle was 67.343mm. with a standard deviation of 0.188mm. and a 0.88mm. scatter area. The needles of the longest maker averaged 68.594mm., those of the shortest, 66.698mm. with and average difference in length of 1.896mm.
Comparing those with the previously obtained results it was found that while the needle lengths had increased by an average of 0.105mm. the range of standard deviation and scatter area had decreased.
The overall average diameter of the No. 3 needle was 0.1983mm. with a standard deviation of 1.1464μ and a scatter area of 0.005mm. The needles of the thickest maker averaged 0.211mm., those of the thinnest 0.1873mm., an average difference of 0.237mm.
Again comparing results with previously compiled results it was learned that while there was no change in the diameters and scatter area, the standard deviation increased by 0.048mm.
Conclusion
1. The overall average length of the 1.6TSUN needles was 67.343mm. with a standard deviation of 0.188mm. and a scatter area of 0.88mm.
2. The overall average diametter of No. 3 needle was 0.1983mm. with a standard diviation of 1.1464μ and a scatter area of 0.005mm.
3. From the above results it was shown that the accuracy in needle lengths and diameters was remarkably lacking. Thus it can be said that it is essential for the needle manufacturers to practice quality control.
4. The standardization of needle length and diameter should be rapidly investigated and executed.