11-09-2018, 12:22 PM
Well, this didn't very long at all. Same knife, but different blade section, as our original Templaq experiment and we sharpened it the same way as well, one side only. This allows us to paint and then observe the Tempilaq reaction on the undisturbed side of the blade . Brand spanking new 150 grit cubitron belt mounted on a Kally. We didn't thin the Tempilaq as planned because it was quite thin already. This batch was much different than the 325° we received from a different supplier (we think perhaps old stock). The thinner directions specify "For replacing evaporated solvent". We think now that our 325° product had suffered to a degree from "evaporated solvent". It would appear to us that this issue of thinning Tempilaq might be much more related to a balance between flowability and coverage than to reaction time. Makes sense to us now. The applied Tempilaq is allowed to dry before test so the solvents are going to dissipate anyway. Right?
Here's what the edge looked like after paint and before any grinding. This is taken at lower magnification and wider field of view in order to present a little more global view of the paint versus unpainted surfaces.
Now we made just a few very light passes and felt for a burr. We could feel a very slight burr so took a picture. Pieces of the burr are barely visible at the apex but no apparent reaction with the Tempilaq. We hypothesize that the bulk of the burr is hidden by the Tempilaq.
So we made a few more light passes and could then feel very apparent burr formation with the thumb. So we took another picture.
A little more apparent burr in the picture but no apparent Tempilaq reaction. This surprised us to some degree. We did not remove nearly the magnitude of metal from the bevel and edge in this experiment as we did in the 325°F Tempilaq experiment but still, this is 200°F stuff. So what does it take to trigger this stuff? In the 325° test we used a heat gun just to make certain the product was working. In this experiment we decided to try reduced feed rate and increased grinding pressure. We simply held the blade/edge in one spot (2 or 3 seconds) against the belt with maybe a pound of force. Here's the final picture taken at higher magnification.
What a difference this made! A bunch more apparent burr and the Tempilaq has all but fully triggered. Note to self when using a belt grinder to grind (sharpen) knife edges. Keep the feed rate up and the pressure down.
Here's what the edge looked like after paint and before any grinding. This is taken at lower magnification and wider field of view in order to present a little more global view of the paint versus unpainted surfaces.
Now we made just a few very light passes and felt for a burr. We could feel a very slight burr so took a picture. Pieces of the burr are barely visible at the apex but no apparent reaction with the Tempilaq. We hypothesize that the bulk of the burr is hidden by the Tempilaq.
So we made a few more light passes and could then feel very apparent burr formation with the thumb. So we took another picture.
A little more apparent burr in the picture but no apparent Tempilaq reaction. This surprised us to some degree. We did not remove nearly the magnitude of metal from the bevel and edge in this experiment as we did in the 325°F Tempilaq experiment but still, this is 200°F stuff. So what does it take to trigger this stuff? In the 325° test we used a heat gun just to make certain the product was working. In this experiment we decided to try reduced feed rate and increased grinding pressure. We simply held the blade/edge in one spot (2 or 3 seconds) against the belt with maybe a pound of force. Here's the final picture taken at higher magnification.
What a difference this made! A bunch more apparent burr and the Tempilaq has all but fully triggered. Note to self when using a belt grinder to grind (sharpen) knife edges. Keep the feed rate up and the pressure down.