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Statistical Analysis of CNC Slots . Confidence Interval Graph representing depth vs length Discussion . CNC Slots. 95% Confidence Interval for CNC Slots. Discussion. Overall the CNC was off by 1.14 thousandths of an inch
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Statistical Analysis of CNC Slots • Confidence Interval • Graph representing depth vs length • Discussion
Discussion • Overall the CNC was off by 1.14 thousandths of an inch • Depths were pretty consistent within our range of 1 to 6 thousandths of an inch • Depths of 6 to 10 thousandths of an inch had greater variation throughout the cut • Possible reasons: • Increased bending force on bit due to cutting more material in one sweep • May need a slower cutting speed on deeper depths
Statistical Analysis of Dremel on Stewart-MacDonald Base • Confidence intervals • Graphs representing depth vs. length of cut • Conclusions
95% Confidence Interval on Overall Performance for Dremel Slots
Discussion • Overall Accrupro end mill was closer to the nominal value, but it had greater variations in the depth. • End mill needs to have less variation throughout the cut. • Data suggests that the OSG end mill is more consistent throughout the cut. • Need to work on accuracy • Possible reasons for error: • CNC Slots were not at the correct depth • Depth adjustment was done visually using the CNC slots • Dremel Base nuts became loose through the cut • Inconsistent downward force on Dremel while cutting • Travel speed of Dremel was not adequate • Surface variations on plate could have given inaccurate measurements
95% Confidence Interval on Overall Performance for Dremel ‘S’ Line
Discussion • Overall the OSG end mill was closer to the nominal value and had the less variation in the depth • Need to work on accuracy • Possible reasons for error: • CNC Slots were not at the correct depth • Depth adjustment was done visually using the CNC slots • Dremel Base nuts became loose through the cut • Inconsistent downward force on Dremel while cutting • An additional force is added to the bit to do the curved lines • Travel speed of Dremel was not adequate • Surface variations on plate could have given inaccurate measurements