User talk:190.191.89.18

Vickers Hardness Test, Implementation
Regarding your deletion of the linked : The angle of 148° used in the image is correct. 136° is the angle between the indenter faces, while 148° is the angle between the indenter edges as was drawn. Using the tangent of 16° the reader can see where the relation of t = d/7 stems from.

Thank you for your feedback on usefulness. My intention with the image is to show the simplest method t = d/7 stems from. How would you suggest clarifying so that it becomes useful to the reader?


 * Oh, I'm terribly sorry, I didn't understand it, but now that you mention it, I can see the angle is between the edges and not the faces. I couldn't find "148" in the article, so assumed that it was an error, maybe you were reusing an image from another indenter.


 * I think the best way to clarify it is to write it down in the article, something like "This gives an angle from each face normal to the horizontal plane normal of 22° on each side, an angle between edges of 148°, and an angle from each edge to the horizontal plane normal of 16°.", and maybe . If it was on me, I would add your image as a file, like the other images in the article, and not as a link inside the article. I would be pleased to do this changes if you want to, but let me know what you think about it.


 * Regarding to the relation of t=d/7, following the formula in the article, the denominator equals 7.0006... if the angle theta is 136°. I cannot see where does the 148° and 16° comes into action there. Could you please explain? --CachitoV201 (talk) 18:49, 25 June 2020 (UTC)
 * I worry that my figure does not add enough value to be included directly in the page, but I also think that the current derivation of the d/7 equation is not necessarily self-apparent.
 * Either angle can be used to find the depth, but the geometry is more straightforward using the edges instead of the faces. Using the edges $$t =\frac{d_{avg}tan(16^0)}{2} \approx \frac{d_{avg}}{7}$$
 * Bob Clemintime (talk) 00:39, 28 June 2020 (UTC)