digital_rose_engine
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| The cam wheels push a rocker box back and forth, and as you can see from the pictured engine, every time you want a different pattern you have to create a new camwheel (Bill's first camwheel was hand-cut from lucite and was a project in and of itself). And it seemed like an obvious thing to propose using an arduino and a motor to push the rockerbox back and forth with a lot more flexibility. (Bill has since discovered that the original technology has been somewhat preserved by the Society for Ornamental Woodturners and plans for various cam designs are available, but before we know that, a digital test system to figure out how to eventually design the cams made sense). And of course that led to asking why not put all 3 motions (radial, Z, and rotation) under computer control? Bill said "you should give it a go" and someone was dumb enough to say "sure, why not?" :-) | The cam wheels push a rocker box back and forth, and as you can see from the pictured engine, every time you want a different pattern you have to create a new camwheel (Bill's first camwheel was hand-cut from lucite and was a project in and of itself). And it seemed like an obvious thing to propose using an arduino and a motor to push the rockerbox back and forth with a lot more flexibility. (Bill has since discovered that the original technology has been somewhat preserved by the Society for Ornamental Woodturners and plans for various cam designs are available, but before we know that, a digital test system to figure out how to eventually design the cams made sense). And of course that led to asking why not put all 3 motions (radial, Z, and rotation) under computer control? Bill said "you should give it a go" and someone was dumb enough to say "sure, why not?" :-) | ||
| - | I was fortunate enough to have the guts of a sherline 3 axis platform that eliminated the need to figure out a lot of the mechanical side of it. And I had a rotary table that came with my Taig mill. After a few false starts I had a prototype running with a Uno running three small stepper motors via Sparkfun easydriver boards and a spring-loaded pen holder. | + | I was fortunate enough to have the guts of a sherline 3 axis platform that eliminated the need to figure out a lot of the mechanical side of it. And I had a rotary table that came with my Taig mill. After a few false starts I had a prototype with a Uno running three small stepper motors via Sparkfun easydriver boards and a spring-loaded pen holder. |
| {{:penholder.jpg?100|}} | {{:penholder.jpg?100|}} | ||
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| {{:cosines.jpg?100|}} | {{:cosines.jpg?100|}} | ||
| - | 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. |
| {{:scribed.jpg?100|}} | {{:scribed.jpg?100|}} | ||
| - | 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|}} | {{:closeup.jpg?100|}} | ||
digital_rose_engine.txt ยท Last modified: 2017/01/15 03:35 by 74.243.171.60
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