Download Further Experiments in the Field of the Terephthalic Acid by Bogert M. T., Nisson Ph. S. PDF

By Bogert M. T., Nisson Ph. S.

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These values of edge width were made with an improved statistical sampling over that done in the previous sections of this report. 2 No significant reduction in EW values was found for a 2 stage polishing process going from CrO to 1 micron diamond or going from 6 micron diamond to 1 micron diamond. 3 An increased polishing angle for the final polish of ∆β = 5 to 6 degrees was found to be slightly better than 3 degrees, in agreement with the results presented in section 5. 4 A minimum of 12 to 15 b&f passes over the leather wheel was found necessary to remove the coarsest abrasion grooves from extending up to the cutting edge on blades pre-ground on 600 grit wheels.

The outline of the original blade shape was fitted to that of the buffed blades by moving the outline onto the buffed blade image so the lines from the bottom and top faces fit the buffed blade image. If the buffing removed significant material from the top and bottom faces appearing on the micrographs, then the outline would move further to the right than they should have. This would have the effect of reducing the contraction distance from the true tip position. The average retraction distance for Table 5 Measurement of retraction distances.

40. ) Comparing the EW values measured on blades pre-ground with either 220 grit or 1000 grit wheels to the results of the pre-ground 600 grit blades of Table 6 found no significant changes, providing and adequate number of b&f passes were made. Blades examined after different numbers of b&f passes revealed that a minimum number of 12 to 15 passes was necessary to produce face smoothness that removed most all of the coarsest abrasive grooves from extending up to the cutting edge. Figure 48 illustrates the effect of increasing the number of b&f passes from 4 to 10 on a blade pre-ground with 600 grit wheels.

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