In addition :
Cardboard details :
In regards to the values :
As a rough check, as long as the runs are changing the median by more than the standard deviations it is unlikely the result is stable (i.e. the true value).
|cardboard cut (m)|
|Ai-De||15||50-25(18)||1.1+0.0(0.1)||3.1-0.2(0.3)||14- 3( 2)|
|20||68- 8(30)||0.7-0.1(0.1)||1.8-0.4(0.1)||8- 3( 1)|
|Galaxy Cleaver||15||56+ 2(13)||1.3-0.1(0.1)||3.5-0.3(0.3)||15- 2( 2)|
|20||63- 8(30)||0.9-0.2(0.1)||2.3-0.4(0.1)||9- 2( 1)|
In short, the Ai-De Chef knife shows a 77 (25)% increase in edge retention from the 20 to the 15 dps micro-bevel. A direct comparison :
and a point by point ratio comparison showing the consistent increase in performance by the 15 dps bevel :
The Galaxy showed a 69 (22) % increase :
and also showed the same consistent behavior :
As these knives are made from similar steels and the results are consistent they can be combined. With the data is pooled it shows an edge retention advantage of 66 (17) % increase when the angle is changed from 20 to 15 dps.
In regards to the lower angle having increased edge retention the reasons are :
Thus increasing the edge angle does not offer a practical increase in strength and durability as it already is strong and durable enough to resist damage at 15 dps. The increased edge angle just makes the edge into a heavier wedge which actually thickens faster under a given amount of wear and the wear will be accelerated due to concentration of forces around the edge due to the higher angle.
Comments can be emailed to cliffstamp[REMOVE]@gmail.com or by posting to the following thread :
Most of the pictures in the above are in the edge
retention album at PhotoBucket.
|Last updated :||16/09/2013|