author
50Instructables258,690Views307CommentsMy basement in Oklahoma, USJoined February 1st, 2017
Formerly the owner of a company that designed software for avionics (EFIS, FMS, etc.) and video games (Tetris, Robocop, Predator, Michael Jordan in Flight, and a number of others), I'm now retired and finally have the time to design, print, assemble, test and publish 3D models for my kids, grandkids and, hopefully, you and yours to enjoy. See all of my videos here: https://www.youtube.com/user/popzct0214/videos.

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  • gzumwalt entered Apple Coin Bank in the Make it Move Contest contest 1 day ago
  • gzumwalt commented on gzumwalt's instructable Marblevator Mini, Loop.15 days ago
    Marblevator Mini, Loop.

    Thank you very much, I'm glad you enjoyed it!I do tend toward mechanical designs with "some assembly required".Thanks again,Greg

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  • gzumwalt commented on gzumwalt's instructable WiFi Kit 32 NTP Clock25 days ago
    WiFi Kit 32 NTP Clock

    The libraries have the same names as the ".h" files, thus you will need to add "time.lib", "WiFi.hlib, "WiFiUdp.lib" and "U8g2lib.lib" to your sketch. On a Mac, these libraries are located in "Documents/Arduino/libraries".Hope this helps!Greg

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  • gzumwalt commented on gzumwalt's instructable Marblevator, Mechanisms.27 days ago
    Marblevator, Mechanisms.

    Hi Jim,I believe the only tutorial I created using Autodesk Fusion 360 was this: https://www.instructables.com/id/The-Design-of-Cy... and it's really not that good.I'll see what I can do for a marble machine tutorial, maybe even this one.Thanks for your question, and if you have any more, just ask and I'll do my best to answer it!Greg

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  • gzumwalt's instructable Marblevator Mini, Loop.'s weekly stats: 27 days ago
    • Marblevator Mini, Loop.
      4,160 views
      87 favorites
      14 comments
  • gzumwalt commented on gzumwalt's instructable Marblevator Mini, Loop.4 weeks ago
    Marblevator Mini, Loop.

    Comments such as yours are inspirations themselves, and I cannot thank you enough for your kind words, and am glad you enjoyed this, and my other models!Greg

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  • gzumwalt commented on gzumwalt's instructable Marblevator Mini, Loop.4 weeks ago
    Marblevator Mini, Loop.

    Thank you very much, I’m glad you enjoy them!Greg

    Thanks, I'm glad you do!Greg

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  • gzumwalt commented on gzumwalt's instructable Marblevator, Mechanisms.4 weeks ago
    Marblevator, Mechanisms.

    Thanks yet again Donald! I am very excited to see your results!Except for the threaded components (you may require a tap and die set) this model assembles easy and runs great.Greg

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  • gzumwalt commented on gzumwalt's instructable Marblevator Mini, Loop.4 weeks ago
    Marblevator Mini, Loop.

    Thank you very much, I’m glad you enjoyed it!I was truly surprised at how fast and reliable the short looped track is!Greg

    Many thanks Donald, I always highly appreciate your input!

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  • gzumwalt entered Marblevator Mini, Loop. in the Make it Move Contest contest 4 weeks ago
  • gzumwalt's instructable Marblevator, Mechanisms.'s weekly stats: 5 weeks ago
    • Marblevator, Mechanisms.
      384 views
      3 favorites
      2 comments
  • gzumwalt commented on gzumwalt's instructable Marblevator, Mechanisms.5 weeks ago
    Marblevator, Mechanisms.

    Thanks! It's a fairly simple print and assembly, and mine has run for a week without dropping a marble!Greg

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  • gzumwalt commented on gzumwalt's instructable Hummingbird6 weeks ago
    Hummingbird

    That looks awesome, congratulations !Greg

    Thank you so very much for your kind words, I'm truly glad you enjoyed it!Greg

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  • gzumwalt's instructable Complaint Button.'s weekly stats: 6 weeks ago
    • Complaint Button.
      5,680 views
      58 favorites
      10 comments
  • gzumwalt commented on gzumwalt's instructable WiFi Kit 32 NTP Clock7 weeks ago
    WiFi Kit 32 NTP Clock

    I’ve had a lot of fun using this board, good price also.

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  • gzumwalt commented on gzumwalt's instructable Hummingbird7 weeks ago
    Hummingbird

    thank you so very much, I’m pleased you enjoyed it!

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  • gzumwalt commented on gzumwalt's instructable Complaint Button.7 weeks ago
    Complaint Button.

    Thanks, that’s why I enjoy this!

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  • gzumwalt commented on gzumwalt's instructable Horse, Prototype7 weeks ago
    Horse, Prototype

    Unfortunately, I cannot seem to find the manner in which to export CAD or DXF if Autodesk Fusion 360. If anyone can direct me to the procedure, I'll do my best.Greg

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  • gzumwalt commented on gzumwalt's instructable Complaint Button.7 weeks ago
    Complaint Button.

    I've uploaded "Base Plaque Left Blank.stl" and "Base Plaque Right Blank.stl".Please let me know how they work out.Greg

    Thanks, I'm glad I received a smile from this model!Greg

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  • gzumwalt commented on gzumwalt's instructable Complaint Button.7 weeks ago
    Complaint Button.

    Thanks!I most certainly will! I’m away from my office right now but I can easily upload them tomorrow. Just to make sure, you want just the plaque background with no text, correct?Greg

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  • gzumwalt commented on gzumwalt's instructable Hummingbird8 weeks ago
    Hummingbird

    That depended on the color for the ball joints. When I printed the first model using Ultimaker Transparent PLA, there was no "oozing" and the ball was almost exactly 6mm. In this case I use the 2.2 mm version which, being thicker, has a larger surface area between the rod and ball. When using certain other colors, white for example, there was some oozing and the ball was slightly larger than 6mm I used the 1.2mm in these cases.Hope that helps!Greg

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  • gzumwalt commented on gzumwalt's instructable Hummingbird8 weeks ago
    Hummingbird

    Thanks!I'm truly sorry you're experiencing difficulties with this model. The ball joints are perhaps the most precise parts in this model. Try scaling the arm down very, very slightly on the X and Y dimensions, but not the Z (thickness) axis.Hope this helps!Greg

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  • Heltech WiFi Kit 32 Based Network Scanner

    Thank you very much!I have yet to create a web radio, but keep watching, I may do so soon!Thanks again,Greg

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  • gzumwalt's instructable Horse, Prototype's weekly stats: 8 weeks ago
    • Horse, Prototype
      4,593 views
      75 favorites
      12 comments
  • gzumwalt commented on gzumwalt's instructable Horse, Prototype8 weeks ago
    Horse, Prototype

    Lora and I are attending the Rapid conference in Fort Worth this week (rapid3devent.com) with Ultimaker. If you’re interested in the future, you should attend with us. Ultimaker’s new S5 printer is stunning!

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  • gzumwalt commented on gzumwalt's instructable Horse, Prototype8 weeks ago
    Horse, Prototype

    Thank you, I hope you enjoyed it!

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  • gzumwalt commented on gzumwalt's instructable Horse, Prototype2 months ago
    Horse, Prototype

    Hope this is who I think it is...What, you didn’t like this: https://www.instructables.com/id/Hummingbird/???Hi Geoff!

    Thank you very much!I do not, but if Autodesk Fusion 360 can export in either of those formats, I’ll see what I can do. I also have grandkids, I know that feeling!Greg

    I developed the leg motions myself. I used software I had written (https://www.youtube.com/watch?v=TbzAQyXUwXs) for Saber and Saber 2 (https://www.instructables.com/id/Saber-2/), Grashofs laws of 4 bar linkages, Autodesk Fusion 360 joints and joint animations, as well as a healthy dose of trial and error! Hope this kinda helps. And thank you very much, I’m very pleased you enjoyed this model. Greg

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  • gzumwalt commented on gzumwalt's instructable Saber 22 months ago
    Saber 2

    Sorry yet again, I am away from my computer right now, but if I recall there is only 1 AxleGearDrive.stl (connects the motor to the gear train), 5 AxleGearLeft.stl (used to connect the left side control arms to the gear train), 5 AxleGearRight.stl (used to connect the right side control arms to the gear train), and 10 AxleGearIdler.stl (for those gears without control arms).I'll examine the PDF when I return.

    No, that would be AxleGearDrive.stl. AxleGearRight.stl and AxleGearLeft.stl are used in combination with SpurGear(16 teeth).stl to form the mechanism that animates the legs.AxleGearDrive.stl connects the motor to the gear train.

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  • gzumwalt commented on gzumwalt's instructable WiFi Kit 32 NTP Clock2 months ago
    WiFi Kit 32 NTP Clock

    Congratulations, great work!Greg

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  • gzumwalt commented on gzumwalt's instructable Saber 22 months ago
    Saber 2

    You are very welcome!Yes, I believe that is correct.

    I'm truly sorry about that, I believe I uploaded the correct file into Step 1, AxleGearRight.stl".Again, truly sorry.Greg

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  • gzumwalt commented on gzumwalt's instructable Hummingbird2 months ago
    Hummingbird

    If you’d like, I would be happy to upload the body halves, wings and stem in Autodesk Fusion 360 format.

    As noted, I'm using Cura 3.2.1 as well on Ultimaker 2+ Extended and Ultimaker 3 Extended printers. I haven't a clue as to why your experiencing this, but you might try the "Enable gradual" infill option that should increase the infill as the model height increases.Sorry for the problems.

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  • gzumwalt commented on gzumwalt's instructable Hummingbird2 months ago
    Hummingbird

    Thank you very much, and you are very welcome, I’m truly happy that you enjoyed it!

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  • gzumwalt commented on gzumwalt's instructable Hummingbird2 months ago
    Hummingbird

    Hi ntiong,Thank you very much for your kind words!Regarding the workflow for Hummingbird, as I mentioned in the introduction, my wife truly enjoys feeding and watching hummingbirds as they pass through, so I decided to create Hummingbird for her to watch during the hummingbirds "off season". I started the design using the numerous photos we've taken of the hummingbirds. I imported a few select photos into Autodesk Fusion 360 using the Canvas function then outlined the various body components (body, wings and tail) using the Autodesk Fusion 360 spline function. Next, after studying the wing motion of a "typical" hummingbird, I decided to use a captured ball joint (somewhat similar to a helicopter swash plate) for the pivot and rotate mechanism, and since I try to m...

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    Hi ntiong,Thank you very much for your kind words!Regarding the workflow for Hummingbird, as I mentioned in the introduction, my wife truly enjoys feeding and watching hummingbirds as they pass through, so I decided to create Hummingbird for her to watch during the hummingbirds "off season". I started the design using the numerous photos we've taken of the hummingbirds. I imported a few select photos into Autodesk Fusion 360 using the Canvas function then outlined the various body components (body, wings and tail) using the Autodesk Fusion 360 spline function. Next, after studying the wing motion of a "typical" hummingbird, I decided to use a captured ball joint (somewhat similar to a helicopter swash plate) for the pivot and rotate mechanism, and since I try to make my designs 100% 3D printed, I designed a test fixture to determine the minimal size ball joint I could reliably 3D print, which ended up being a 6mm ball and a 6.3mm hole. With these two dimensions, I was then able to scale the body, wings and tail outlines I had traced earlier to a size suitable for the wing motion mechanism. With the scale (size) determined, I next designed the gear train for the hummingbird body using the Autodesk Fusion 360 Gear add-in, then printed and assembled the first body and wing prototype which ended up looking like this: Next was the base design. In order to move the hummingbird fore and aft, I decided on a ratio of 6 wing flaps to 1 complete fore / aft cycle. This required a gear reduction which also provides the increased torque required for the fore and aft body motion. The first base design used a gear train to connect the body to the base and maintain a level pitch, and ended up looking like this:As I noted in the Youtube video comment section, I wasn't pleased with the smoothness (more correctly lack thereof) of the fore and aft motion with this base design, so I redesigned the base mechanism using a parallelogram to connect the body to the base to facilitate the fore and aft motion.Finally, the flower is my interpretation of the plastic flowers on the humming bird feeders my wife uses, and the stem was designed to position the flower at the correct point.Hope this helps, and if you have any further questions, just ask!Greg

    Hi ArielB10,I'm sorry but I don't know! At my age, I've simply had many years experience tinkering with gears and mechanisms, and used some of our photographs and videos as a guideline to combine the gears with a hummingbird, and this was the result! You may try searching for gears and mechanisms on the web. I would try and search for "Autodesk Fusion 360 Gears" for example to study gears.Hopefully someone else here can direct you to an appropriate answer.Greg

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  • gzumwalt commented on gzumwalt's instructable Hummingbird2 months ago
    Hummingbird

    Thank you very much, I'm truly glad you enjoyed this model!Regarding the power source, I use a "power jack" soldered to the motor matching the size and style of the plug on the power supply (I use ac to dc wall mount style power adapters), but you may just as well solder the power supply wires directly to the motor. Just make sure the motor turns the gears in the correct direction. Also note the motor may be installed in either side of the base, depending on which way you want your model to face and whether or not you want to see the motor.Thanks again!Greg

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  • gzumwalt commented on gzumwalt's instructable Hummingbird2 months ago
    Hummingbird

    Excellent work, congratulations!Greg

    Can't seem to view the video. :(Greg

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  • gzumwalt commented on gzumwalt's instructable Heltech WiFi Kit 32 Based Network Scanner2 months ago
    Heltech WiFi Kit 32 Based Network Scanner

    Thank you very much, I'm truly glad you enjoyed these!I've designed other Heltec based projects, and may publish them soon.Thanks again!Greg

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  • gzumwalt commented on gzumwalt's instructable Hummingbird2 months ago
    Hummingbird

    Hi Rolland,I've uploaded the Autodesk Fusion 360 "Flower.f3d" file which is the design file for the flower.Hope this helps!Greg

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  • gzumwalt commented on gzumwalt's instructable Hummingbird3 months ago
    Hummingbird

    Just uploaded what I believe to be the correct "Axle Gear Compound 60, 20.stl".Sorry again, and hope I got it right this time.Greg

    Just uploaded what I believe to be the correct "Axle Gear Compound 60, 20.stl".Sorry again, and hope I got it right this time.Greg

    Just uploaded what I believe to be the correct "Axle Gear Compound 60, 20.stl".Sorry again, and hope I got it right this time.Greg

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  • gzumwalt commented on gzumwalt's instructable Hummingbird3 months ago
    Hummingbird

    I’m truly sorry about this. Unfortunately, I’m out of the country right now but I’ll fix this when I return in a few days. Again I’m truly sorry. Greg

    I’m truly sorry about this. Unfortunately, I’m out of the country right now but I’ll fix this when I return in a few days. Again I’m truly sorry. Greg

    I’m truly sorry about this. Unfortunately, I’m out of the country right now but I’ll fix this when I return in a few days. Again I’m truly sorry. Greg

    Thank you so very much, I’m glad you enjoyed it!It was indeed frustratingly complicated the first time. The second attempt finally performed as I had desired, but it too required some “tuning”. :)Thanks again!Greg

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  • gzumwalt commented on gzumwalt's instructable Hummingbird3 months ago
    Hummingbird

    Hi EshRobotics,First, well, I'm old and have seen a lot of things, taken a lot of pictures and made a lot of notes over the years.However, I recommend websites that show gears and automata. For example, if you use Autodesk Fusion 360, then search for "Fusion 360 gears" and watch the videos. Also search for "mechanisms", "automata mechanisms", "wooden mechanisms" or the like and you'll find a lot of images, videos and "how to's".Best of luck!Greg

    This worked very well for me: https://www.instructables.com/id/Hummingbird-25mm-Motor-Adapter/. It is much easier to create an adapter than it is to modify the base. If it doesn’t work for you, let me know and I will post the base design. Greg

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  • gzumwalt commented on gzumwalt's instructable Hummingbird3 months ago
    Hummingbird

    I’m sincerely sorry for the difficulties you’ve experienced with this model. Could you please provide the version number of the Cura slicer you are using and your printer model?I used Cura 3.2.1 and printed on an Ultimaker 2+ Extended and an Ultimaker 3 Extended. Again, I am trying sorry for the difficulties you’re experiencing.Greg

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  • gzumwalt's instructable Hummingbird's weekly stats: 3 months ago
    • Hummingbird
      10,100 views
      130 favorites
      45 comments
  • gzumwalt commented on gzumwalt's instructable Hummingbird3 months ago
    Hummingbird

    Thank you very much!Greg

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  • gzumwalt commented on gzumwalt's instructable Hummingbird3 months ago
    Hummingbird

    thank you very much, I’m glad you liked it!Yes, I did animate the gears and joints, mostly to check my math to make sure the body didn’t exceed the calculated limits and run into he base gears. However, I never was able to figure out how to model the wing pivot, so I built a small test version. Thanks again!Greg

    Thank you very much!Check this out:https://www.instructables.com/id/Hummingbird-25mm-Motor-Adapter/

    Thank you so very much, I’m glad you liked it!Greg

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  • gzumwalt commented on gzumwalt's instructable Hummingbird3 months ago
    Hummingbird

    Thank you, and thanks for your vote!Greg

    Thank you very much! It did take awhile, but the wife smiles when she sees it and that and comments such as yours make it all worthwhile.Greg

    Thank you very much for your kind words, I am truly happy that you enjoyed it!Greg

    Hi bgerens,Depending on your printer type, settings, colors, etc., ABS may work quite well.Believe it or not, the design process for this model started with "Wheel Body.stl" and "Rod Connecting 6.3mm Hole.stl" which are perhaps the most difficult of the Hummingbird parts to print. The ball on the wheel is 6mm, and the hole in the connecting rod is 6.3mm. Try printing these parts first to see how well they fit, and if they do, you should be good to go!The attached photo shows I performed this fit test of the wheel and connecting rod on a test base, to test the geometry and fit of these components. This test was how this design got its start, quite awhile ago!Greg

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  • gzumwalt commented on gzumwalt's instructable Hummingbird3 months ago
    Hummingbird

    Thank you so very much! It was indeed a labor of love to complete it for my wife, and she smiled, a lot.

    The motor I used in the original design (as described in the instructions) slides into either of the 16.20 mm holes located on either side of the base (I forgot to mention in the Instructable that the motor can be mounted on either side of the base, depending on which direction you will be placing your Hummingbird).A month after completing this design, I decided to change to this motor, 30RPM DC 6v .1A 25mm Diameter Gear Box Speed Reducer Motor (still available on e-bay), that I had in my "box of motors" box. This motor is much quieter at the expense of increased size, so I made this 25mm adapter and gear such that it presses into the 16.2mm holes in the base, and has an extended gear. I worked quite well, and saved me from having to re-print the base.

    You are very welcome, and I am pleased this model made your day!

    Thank you very, very much! It makes me happy when my design puts a smile on a face!

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  • Balloon Powered Single Cylinder Air Engine Open Chassis

    Hi MatthewN85,The original design (before the train) directly drives the front wheels putting which makes it run faster, but puts more "strain" on the air engine. The gear reduction of this design increases the torque at the expense of speed, but it also places less strain on the air engine thus making it operate more efficient (while small, there are air losses on both ends of the piston rod and around the build plate).Party balloons may work, I used the punch balloon for it's thickness and the small hook on the end.Greg

    Think of it this way, with air loss being a constant, achieving a higher air engine RPM with a gear reduction increases torque in this design and running time. The additional distance achieved by the second model over the first was only 10 feet, and the earlier model got there quicker, but the later model could do so over rough terrain thanks to the increase torque and runtime.I'll check my backup files to see if I still have the Autodesk Fusion 360 files, and if I find them, I'll post and/or send them to you. Keep in mind, these engines require meticulous printing, filing, sanding and assembly to attain the performance shown in the videos, so please don't expect to print, assemble and run to achieve the results in the video.Thanks for you interest!Greg

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  • gzumwalt commented on gzumwalt's instructable Hummingbird3 months ago
    Hummingbird

    Thank you very much, I'm truly glad you enjoyed it!Regarding the link you sent, wow, that is truly stunning and amazing work! However, my inspiration for this model simply came from years of watching my wife's smile as she feeds and watches the hummingbirds at our lake home, and the design is just an ongoing learning experience for me in geared devices and automata. If you examine my other models appearing here, YouMagine, MyMiniFactory and/or Thingiverse, you'll see that I credit the person, place or thing (see Marblevator Air, Saber, Saber 2 as an example) that provided the spark for the design. For this model, it was my wife's smile, nature and my desire to keep learning as long as I can.Many thanks again!Greg

    Thank you very much indeed!If you haven't noticed, I do like gears:https://www.instructables.com/id/Perseverance-Peti...https://www.instructables.com/id/Saber-2/https://www.instructables.com/id/Tabletop-Pull-Bac...Thanks again!Greg

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  • gzumwalt commented on gzumwalt's instructable Hummingbird3 months ago
    Hummingbird

    Thank you very much, I'm glad you enjoyed it!Greg

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  • gzumwalt entered Hummingbird in the Epilog Challenge 9 contest 3 months ago
  • gzumwalt posted an instructable Hummingbird3 months ago
  • gzumwalt's instructable Best Dressed Leprechaun Trophy's weekly stats: 3 months ago
    • Best Dressed Leprechaun Trophy
      92 views
      0 favorites
      2 comments
  • gzumwalt commented on gzumwalt's instructable Best Dressed Leprechaun Trophy3 months ago
    Best Dressed Leprechaun Trophy

    Thank you, she says it’s already a hit!

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  • gzumwalt commented on gzumwalt's instructable Single Cylinder Air Engine4 months ago
    Single Cylinder Air Engine

    I never tried to print at 20%, but you need 100% to minimize air leaks in the cylinder, piston and valve. Print 2 "Pin Wheel.stl", and one each of the remainder.Hope this helps!Greg

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  • gzumwalt commented on gzumwalt's instructable Four Cylinder Air Engine, Experimental4 months ago
    Four Cylinder Air Engine, Experimental

    The third photograph in step 2 shows the alignment of the rotor with piston #1. Primarily, the rotor is aligned such that compressed air is introduced into a cylinder about 20 degrees after top dead center.Hope that helps!Greg

    You may try running it on the exhaust port of a shop vac. While I never tried it, I did use a shop vac on the single cylinder version.Greg

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  • gzumwalt's instructable XOXO's weekly stats: 4 months ago
    • XOXO
      78 views
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      0 comments
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