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No critics here. Keep gong Tom!Dave
@Tom:Except for the burrs, I do not see severe obvious errors. So, you should not be too disappointed by the critics. You are on the right track, and you are very close to a good result.Also, the pattern of you scraping passes looks good to me. The more random it gets, be better it is. If you look at in which direction you scraped on a spot and the direction is random (half one direction, other half the other direction) you know that you are good or almost good. If all high spots have the same scraping direction, there is work left to be done.I know how annoying scraping can be. Nick
[...] But I have to say, that the spots per square inch method is crap. Not the fact that you want to have a certain number of spots, but the fact that there is no repeatable way to measure them. Just make a thicker layer of blue, and the coverage shoots up. If the layer is thick enough, you have 100% A better way is to observe how the spots develop. As long as they do get more, there is work left to be done. If they stay the same and you have to split them to increase their count, you can call it good. [...]
[...] I have a question about the stone you guys use for clearing the burrs, I have seen this stone mentioned in some videos I have been watching, its a tin flat black stone...[...]
Point 2, continued.. .On the nature of burrs... So this is my understanding about the nature of burrs, based on observation, and on what I've read in Connelly's book, and what I've read on this forum... Please correct me if this is off.... When we cut with the scraper, there is a lip of metal that is left behind, at the end of the stroke. The schematic tries to show this... it is not accurate of course in that it is not to scale, and that the deepest point of the cut is drawn near the lip (burr). The deepest point of the cut should be closer to the midway of the stroke, and the blade should start coming up before the end of the stroke. Well, I probably scrape the wrong way (i.e., as I drew...) So in some twisted sense, my drawing is accurate! So when we stone the work, we knock down the lip raised by the blade... I think... tom
Tom, your method of finding out the thickness of the blue won't work that well.Make a very thin layer and pick up all the blue with your work. Means: Spot, wipe off from work, spot, ... until the work no longer picks up blue. Part of the blue still will be sitting in the many pores of the surface plate. These pores are a desirable property.You will find out, that it takes much more blue on a fresh plate than it takes on one that you have been using after cleaning.
and now my tongue is blue