So for those of you who read my first post, heres the results! I decided to finish this part tonight because I remembered I am getting my wisdom teeth pulled tommorow morning, so I’ll be out of commision for a bit.
I spent about 35 minutes with the Veritas Mk2 jig. I started with the 1000 grit side and moved to the 4000 grit side. At the end I’ll post some pictures of the factory finish that came on the chisels.
This is the blade edge at 40X, notice that even when cleaned up there is still some rough edges?
Here it is at 100X, the rough edge becomes much more evident.
And finally at 400X, due to the light the rough edge appears slightly better, but it is only from the fact that we can see the rounding, or rather can’t, my scope only shows reflective surfaces, and since a radius isn’t reflective I may or may not pick it up, in this case I can’t without rotating the chisel.
This is the bottom side showing a corner (40X), notice the “frosting” on the edge? I think it is either from the slurry building on the edges, or me placing uneven pressure on the front/back strokes slightly chamfering the edges.
Here is the bottom at 100X. If you look close you can see ghosting of where I haven’t fully cleaned up the old grinding marks, even though with the naked eye it looks perfect. The speckles might be corrosion or dried on grinding agent.
Bottom of the chisel at 400X. Multiple directions of grind evident.
A side view at 40X, a fine point is evident though barely.
Factory bottom at 40X, much closer and it lost any definition of size.
Factory edge at 40X. So rough it was actually difficult to focus on it, plus the reflection was too low for any good detail.
I didn’t get the opportunity to put it onto the comparator but for measurement our machinery is only good to +/- 2 minutes, so we are within the range of the machine tolerance. I would have to send it to a metrology lab to get exact results. However I did put the face of the chisel on a profilometer which registered as 1.8 Ra. Or, .0000018 inches (Ra is the arithmetic average of the absolute values of the profile height deviations from the mean line, recorded within the evaluation length).
As I add more stones and chisels I plan on comparing them and will post results.
-- Casey, Engineer, Escanaba, MI