Precision internal grinding

Qian, J., Li, W., and Ohmori, H., Precision internal grinding with metal-bonded diamond grinding wheel. Journal cf Materials Processing Technology, Vol. 105, 2000b, pp. 80-86. 

In addition to meeting the foregoing requirements, a good internal standard will be easy to add uniformly and precisely, and (preferably) no appreciable amount of the element St (free or combined) will be present in the sample before the addition. Cope29 provides an excellent illustration of these points. He found that yttrium nitrate dissolved in ethyl alcohol could be added to a powdered uranium mineral in a mortar, whereupon grinding immediately to dryness dispersed the internal standard (yttrium) so uniformly that uranium could be satisfactorily determined in certain minerals. But the mineral euxenite is an exception, for it contains both yttrium and uranium, and this complicates the uranium determination with yttrium as internal standard. 

A sensitive reverse-phase HPLC method has been developed for the analysis of etodolac in tablet formulation [22]. The chromatographic separation was achieved using a reverse-phase Cu column, having dimensions of 3.3 cm x 0.46 cm i.d. (3 pm particles) and which was maintained at 30°C. The mobile phase consisted of pH 6.0 phosphate buffer / methanol (60 40 v/v), and was eluted at 1 mL/min. Analyte detection was effected on the basis of UV detection at 230 nm. Diazepam was used as an internal standard. The sample preparation entailed grinding the etodolac tablets, followed by extraction with methanol (using sonication). A retention time of 1.46 min was obtained for etodolac under these conditions, and the method was found to be linear, precise, and accurate over the concentration range of 0.01 to 0.1 mg/mL. 

Onikura H, Ohnishi O, Yamamoto K, Koga T (2004) Fabrication of 10-20 pm diameter micro flat drills by precision grinding and their applicatimi to drilling of duralumin and titaniiun alloy with ultrasonic vibration. In Proceedings of the 4th EUSPEN international crai-ference, Scotland... 

Ohmori, H., "Electrolytic In-Process Dressing (ELID) Grinding Technique for Ultra Precision Mirror Surface Machining," International Journal ofJSPE, Vol. 26, No. 4, 1992, pp. 273-278. 

Stephenson, D.J., Veselovac, D., Manley, S., and Corbett, J., Ultra-precision grinding of hard steels. Journal of International Societies for Precision Engineering and Nanotechnology, Vol. 25, 2001, pp. 336-345. 

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