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  1. #1
    Posted a thousand or more times jhitesma's Avatar
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    A different approach to CNC

    As some of you who've followed some of my other threads already know this time of year my projects tend to get pushed aside to make room for a few weeks of egg decorating. My family has both Ukrainian and Polish roots and has been doing pysanky egg decorating since long before I was born. I picked it up at a young age and now every year look forward to cranking out a few eggs. I dug out the supplies and did a quick test egg a week ago:

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    And a quick shot of some eggs from past years that have survived:
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    It's a fun process and dealing with the batik style building of colors helps break my mind out of a rut and think differently. I have some modern electric kistas which give extremely fine consistent wax control - but also still enjoy breaking out the candles and using traditional handmade kistas that are a little less predictable.

    And while I'm a fan of tradition I'm also a gearhead and techie who loves to try new things. I heard about the egg-bot years ago and have considered making one for a long time because while I respect the work that goes into producing a kit there's just no way I can justify spending $200+ on one. A few years ago I rigged up a simple manual egg lathe to help me lay down guidelines - but it wasn't very effective. A year after that my mom got me a molded plastic egg lathe and I've since gotten hooked on the nice accurate guidelines it gives me. But it's still kind of tricky to use.

    When I got my 3D printer a few weeks later I saw a printable egg-bot design and immediately bookmarked it. At the time I didn't think my printer was up to tackling it and it looked like quite a long print. Since then however I've got my printer dialed in and I've tackled many longer prints. So with the egg dyes out I figured it's time to finally make an egg bot!

    I tried printing a fully printed version first but that didn't end well. So I went back to the original design I had seen. And then found an improved version of it and dug in.

    Took me two evenings to print all the parts, and about $18 at the hardware store for the bits to assemble:

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    Then I realized I only had 1 stepper motor on hand. So...I ordered 2 new ones instead which was another $20. I already have a pile of spare stepper drivers (the RAMPS boards I bought for my MPCNC and Printer came with A7805 drivers but I replaced them with DRV8825's, plus ordered some spare DRV's in case I burned any out.) and I have a bunch of spare arduino's on hand. I ended up using a RAMPS/Mega setup since it simplified the wiring and I had one laying around as a spare...even though it is crazy overkill for this. I may wire up something with just some drivers and a nano board to clean it up later - but for now I just wanted it up and going.

    The official eggbot uses a PIC microcontroller and a custom board that includes 2 stepper drivers...it's an open design but $50 to buy the board and given the ubiquity of arudino's and the number of them I had on hand I didn't really want to bother building a pic based solution. I found a number of arduino based software solutions - but most of them weren't directly compatible with the eggbot extensions for inkscape. Then I found eggduino: https://github.com/cocktailyogi/EggDuino There's a PR for it that adds some improvements and gets it to compile on newer versions of Arduino: https://github.com/cocktailyogi/EggDuino/pull/17 That was submitted a year ago and is still just sitting there - so I get the feeling that the developer has abandoned the project. But with a few tweaks of my own I got it running on the RAMPS:

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    First tests with a pencil proved promising so I hooked up a pen and gave it a go:
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    Not horrible...but not great either. I had it adjusted all wrong physically and the servo that raises and lowers the pen wan't adjusted correct at all so it dragged between moves. But...still a promising start!

    I adjusted the height of the Y stepper and the length of the motion arm for it, dialed in the servo and:
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    Now we're talking!

    I'm still fine tuning it - the steppers were running way too high current and getting hot - then I turned them down too low and the pen started dragging and stair stepping. But it's starting to do pretty well for me:

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    I'm just using extra fine sharpies which aren't all that fine after all as you can see by the nutrition label egg. I'm also still occasionally having some issues with the pen lift - but am learning how to get it setup better each egg.

    Now I need to put some time into designs for it

    Oh - and to keep it related...I bet I can also load up a spinner and do something cool to it
    Stop in and say hi in the unofficial FT IRC channel!

  2. #2
    Kite Eating Tree Trimmer cranialrectosis's Avatar
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    you had me at 'egg lathe'...
    Freiheit schöner götterfunken tochter aus elysium!

  3. #3
    Eggduino... fantastic!

  4. #4
    Fly Angry PsyBorg's Avatar
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    And the winner for this years best use for 3d printed things by a techno nerd goes to.....

    I want to know what time compression software you use to work on all these projects. You CANT be doin all this stuff on just 24 hour days. Specially not being a Dad. That is awesome could you pop out a video telling more about this and then show the process you have come up with? Oh and moving this over to do custom spinners is a great idea which you could probably make a few bucks by doing them for people. Maybe come up with 3 - 5 generic designs you could "Mass" produce and see if FT would sponsor them on the store.
    BILLS LAW: Bils Law specifically states that it covers ANYTHING that Murphy may have forgot, omitted, or plain didn't know in the first place. There fore if it can happen it WILL happen to ME.

    Psyborg FPV You Tube channel.. https://www.youtube.com/channel/UC88...L6-KC9qTa2LgVA

  5. #5
    Posted a thousand or more times jhitesma's Avatar
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    The trick is most of my projects are never really "finished" and some are...well...hibernating

    Like my Manx which went from being my daily driver to getting a "1 month" engine swap (which I actually technically pulled off) followed by a 12 year suspension upgrade :P Though in my defense the big slowdown there was moving from a rental house with a nice garage to buying a house with no garage. Yeah...I've got a big enough yard I could work on it...but I hate leaving tools laying out and I don't have time to put them away every day when I'm done. So...that project makes progress VERY slowly now.

    The big trick is figuring out just how little sleep you actually need to get by

    And honestly I watch everyone else finish plane after plane and quad after quad or crank out hundreds of lines of code while I eat lunch and feel like I can't get anything done - so I guess it's all kind of relative :P

    Don't really want to make a business out of producing spinners. That's when things go from fun to no fun in my experience. I'm willing to help people out with custom one off projects - but not really interested in taking on additional responsibilities or burning out on a hobby because it stopped being a hobby and started being work
    Stop in and say hi in the unofficial FT IRC channel!

  6. #6
    Fly Angry PsyBorg's Avatar
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    Oh something like that IF it took off to much over 5 per month would more then likely have to be done in a real production environment not on your home gear. Kinda why I put Mass in parenthesis. I was thinking of a few to be used as show pieces to test the waters.
    BILLS LAW: Bils Law specifically states that it covers ANYTHING that Murphy may have forgot, omitted, or plain didn't know in the first place. There fore if it can happen it WILL happen to ME.

    Psyborg FPV You Tube channel.. https://www.youtube.com/channel/UC88...L6-KC9qTa2LgVA

  7. #7
    Moderator Craftydan's Avatar
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    Quote Originally Posted by jhitesma View Post
    And honestly I watch everyone else finish plane after plane and quad after quad or crank out hundreds of lines of code while I eat lunch and feel like I can't get anything done - so I guess it's all kind of relative :P
    Wait . . . you take time to eat lunch?!? I think I see your problem

    I've come to grips that there are a lot more of "everybody else" than there are of "Me", so I'm working to separate the "accomplishment rate" online from my build pace -- any other way is discouraging and robs me of time.

    That . . . and I generally don't document anything, which saves me gobs of time
    Crafty Dan
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  8. #8
    Site Moderator JimCR120's Avatar
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    Outstanding and a nutrion label on the egg is hilarious. Once again, another thing I want but will have to wait in an ever-growing line .
    Truths in life:
    1) Everything that happens happens for a reason. Luck does not exist.
    2) In this existence we are part of the problem or part of the solution. The choice is ours.
    3) We aren't defined by our circumstances but by our reactions to them. Crisis reveals character.

  9. #9
    Avid Flying Noob FoamyDM's Avatar
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    I find myself falling asleep in the middle of working on things or sitting up on the couch catching up on TV. I once nodded with a hot soldering iron in my hand. I think back to when I made fun of my friends dad who would routinely turn on the baseball game and promptly pass out. Now I think I get his motivation.

    I just wanted to say this looks like a lot of fun. A quick vid explaining what the pysanky decorating tradition is and how you are making it Egg-cellent with your egg-duino plotter. nice to see someone taking time to enjoy the egg coloring event. Last couple years have been a "wait, Easter's tomorrow?!?" kinda thing
    RTF
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  10. #10
    Posted a thousand or more times jhitesma's Avatar
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    Quote Originally Posted by FoamyDM View Post
    I find myself falling asleep in the middle of working on things or sitting up on the couch catching up on TV.
    Oh yeah...getting fed up with paying for commercials and decided to just cancel cable/dish and live with the 10 channels I can pick up with an antenna (only 3.5 of which are in english) helped free up a lot of time and project funds too Yeah, the first month or two I really missed some of my favorite shows. But now 8 years later I find TV's in public places incredibly distracting and find most television completely unwatchable. A few hours of netflix a week as a reward for doing well in school keeps my daughter happy, and the OTA stuff lets me catch the half dozen or so games a year I'm occasionally interested in or the olympics when they come around. I do tend to have youtube going when I need some background noise - but overall dropping TV has helped me get a lot more done and I get a lot more enjoyment out of that than I ever did out of vegging.

    I just wanted to say this looks like a lot of fun. A quick vid explaining what the pysanky decorating tradition is and how you are making it Egg-cellent with your egg-duino plotter. nice to see someone taking time to enjoy the egg coloring event. Last couple years have been a "wait, Easter's tomorrow?!?" kinda thing
    It's kind of funny, I got a new gopro and a notebook that can actually edit video...and my video output has dropped to almost nothing because I'm using that notebook to catch up on other computer related projects But...I do want to do a little something about this and including some info on the pysanky is a good idea...we'll see what I can come up with - but no promises in finishing that in time to release it before Easter...maybe "for Easter" but before isn't very likely

    And yes, I've had quite a few "oh that's tomorrow" years lately myself!
    Stop in and say hi in the unofficial FT IRC channel!

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