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--- digital_rose_engine [2017/01/15 01:29]
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+++ digital_rose_engine [2017/01/15 03:20]
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-Through the early to mid 1900s the engraving was usually done with a variation of a "turning engine" that came to be known as the rose engine. One is pictured here. The acorn-looking white thing to the right is the piece being worked on. The machine is essentially a slow-turning lathe where the brass camwheels in the middle area push the chuck that holds the workpiece off center in a repetitive and reproducible manner. And then there is a ton of stuff for indexing and depth control and who knows what else.
+Through the early to mid 1900s the engraving was usually done with a variation of a "turning engine" that came to be known as the rose engine. One is pictured here. The acorn-looking white thing to the right is the piece being worked on. The machine is essentially a slow-turning lathe where the brass camwheels in the middle area push the chuck that holds the workpiece off center in a repetitive and reproducible manner while the cutting tool remains in place. And then there is a ton of stuff for indexing and depth control and who knows what else.
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-I used the spring-loaded scribe to scratch a couple of these in silver and enameled them with less ugly results, but I was not happy with these pieces (and in fact the enamel cracked off of the one I actually mounted in a setting earlier this year). The marks were just scratches. Fairly deep scratches admittedly, but a "metal smushed out of the way" groove lacked the reflectiveness of a cut face. And I kept breaking the carbide points off of the tips I was using. This burnished, shiny cut face is, BTW, one reason why you can't really do this kind of work on a router that has a rotating cutting bur or mill.
+I used the spring-loaded scribe to scratch a couple of these in silver and enameled them with less ugly results, but I was not happy with these pieces (and in fact earlier this year the enamel cracked off of the one I actually mounted in a setting). The marks were just scratches. Fairly deep scratches admittedly, but a "metal smushed out of the way" groove lacked the reflectiveness of a cut face. And I kept breaking the carbide points off of the tips I was using. This burnished, shiny cut face is, BTW, one reason why you can't really do this kind of work on a router that has a rotating cutting bur or mill.
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-More work eventually led me to metalworking lathe tools, and I found an inexpensive set at Harbor Freight that fit the bill. But the spring loaded holder didn't work with them, so the software had to extend to controlling the depth of the cut. Which necessitated very flat metal and a better way to hold it down.
+I continued to work on this project through 2014. The cutting problem eventually led me to metalworking lathe tools, and I found an inexpensive set at Harbor Freight that fit the bill. But the spring loaded holder didn't work with them, so the software had to extend to controlling the depth of the cut. Which necessitated very flat metal and a better way to hold it down.
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-(From arduino projects I've seen I should put a link to the code right around here, but there are some things too ugly even for the internet.) But the machine at this stage looked like this:
+(From arduino projects I've seen I should put a link to the code right around here, but there are some things too ugly even for the internet.) But the machine at this stage looks like this:
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-Patterns with "hard turns." This is something that initially intrigued me about building this machine. In theory it should be able to turn at sharp angles rather than curves, which would open up patterns that are probably not possible using the traditional approach. But I think doing this will necessitate being able to rotate the cutting tip which may be a tougher problem. But I think that the tip needs to rotate anyway. This close up shows that even with a cutter there is a lot of smearing going on which I'd like to fix.
+Patterns with "hard turns." This is something that initially intrigued me about building this machine. In theory it should be able to turn at sharp angles rather than curves, which would open up patterns that are probably not possible using the traditional approach. This will probably necessitate being able to rotate the cutting tip which may be a tougher problem. But I think that the tip needs to rotate anyway: this close up shows that even with a cutter there is a lot of smearing going on which I'd like to fix.
 {{:closeup.jpg?100|}}

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