... a YouTube Shop Student Project
This project was developed to help a beginning machinist or hobbyist develop machining skills using the metal lathe. Please keep in mind that I am a beginner myself and not all procedures in this document may be correct, but I have done all that I can to minimize error. Also keep in mind that like skinning cats, there are other ways this project can be completed. Meaning the steps that I outline here are not set in stone. You can download the complete project by clicking the PDF icon in the upper right of the screen.
Why a captured nut puzzle?
While the end result is only a toy of little practical use, I think the operation involved in making it are a great benefit to the beginner machinist. Operations that need to be performed to complete the project include facing, center drilling, drilling, turning to diameter, grooving, chamfering and single point threading. These operations must be mastered along with others while learning to use a metal lathe. And that, my friend, is why I decided on this project.
A note about accuracy
When making the puzzle, it is important that we work as accurately as we can. Not because the puzzle requires it, but rather because we need to hone our budding skills. If you mess up a little trying to get to a certain dimension, don’t sweat it too much, the puzzle will turn out just fine. However, do try your best to machine your parts as accurately as you can.
A note on safety
Revolving machinery can be deadly if steps to work safely are not observed. I assume that you know things like wearing safety glasses, no long sleeve shirts, no neck ties or jewelry, etc, etc. Safety when operating you lathe is YOUR responsibility, not mine or anyone else's. Please observe all safety practices while using the metal lathe.
What is included?
I have included a drawing and assembly diagram for the puzzle. In addition I have listed out the sequence of operations that I have taken to complete the project. Keep in mind as I repeat from above, there are probably as many ways to do this project as there are machinists. If you have a better way of doing it, then please feel free to change things up.
An invitation to watch
I have completed a series of videos on my YouTube channel demonstrating how to make this puzzle. I invite you to watch them and if you are very new to machining, I encourage you to do so. I have inserted the videos below if you care to watch them. They are also on the YouTube Shop Student Page.
(VIDEOS INSERTED HERE ... Coming Soon)
Questions and Comments
Any questions and comments are welcome, or if you would like to send me a picture of your finished puzzle. You can email me at xavier at gtec dot com or through the contact menu link above. I will do my best to answer questions that you may have. Additionally, constructive criticism is welcome. Anything that you may add to make this a better project is welcome.
De intentione cordis gratias ago
I would be remiss if I didn’t thank the following people for the friendship, help and technical guidance.
Richard (MSFN) - https://www.youtube.com/c/MakinSumthinFromNuthin
… Thank you gentlemen!
The drawing below shows the project to be made. You can download the complete project with a much larger drawing by clicking the PDF icon at the top of the page. Alternatively, you can click the image of the drawing below to download just the drawing in PDF format.
I have also provided a 3D rendering of the assembly diagram. Again, you can download the complete project from the PDF icon at the top of the page, or click on the image below to download the PDF of the assembly drawing.
Sequence of Operations
Again let me reiterate that there are many ways that this project can be completed. The following sequence of operations are those that I took to complete it. Feel free to change them up any way you see fit. Additionally, the images I have included here are quite small. To see a larger version of the image simply click on it and it will open in a modal window.
The material I used to make this was a length of 3/4" 12L14 material purchased from Hobby Metal Kits.
(17) Cut thread grooves 0.188” wide to a diameter of 0.392” Note that the puzzle is in its assembled state and the width of the heads are 0.500” and the length of thread including the thread relief groove is 2.000”
(25) Mount main puzzle body in chuck using some soft packing to prevent damage to knurl. Face puzzle end to length, (26) Center drill end with #3 center drilling, (27) Chamfer end 0.063. Removed finished puzzle body
END OF PROJECT (last update 2018 MAY 25)