I made a precision gearbox - with NO GEARS
Added 2024-04-02 10:26:27 +0000 UTCThis was one heck of a project, but I made it in the end. A (nearly) zero-backlash 4th axis for my home made milling machine.
Sources:
How To Mechatronics - What is Cycloidal Drive? Designing, 3D Printing and Testing https://www.youtube.com/watch?v=OsS9-FzKN6s
Levi Janssen - Has a lot of great videos on cycloidal drives
https://www.youtube.com/@LeviJanssen
James Bruton - also has a lot of great videos on cycloidal drives
https://www.youtube.com/@jamesbruton
the best look inside a real cycloidal drive I could find: AvE - BOLTR: SUMITOMO CYCLO GEARBOX | Zero Backlash! https://www.youtube.com/watch?v=dYVPU47c9WA&t=577s&pp=ygUPY3ljbG9pZGFsIGRyaXZl
Cycloidal Drive Parametric Equations - https://blogs.solidworks.com/teacher/wp-content/uploads/sites/3/Building-a-Cycloidal-Drive-with-SOLIDWORKS.pdf
Fusion Script I modified: https://capolight.wordpress.com/2018/07/02/how-to-sketch-equation-curves-in-fusion-360/
My modified version for drawing epitrochoids: https://pastebin.com/05iDZssp
Robin Renzetti's large bore laps: https://www.youtube.com/watch?v=AEsaSN4LLU4&t=1190s
Solid Toolpost inspired by Stefan Gotteswinter: https://www.youtube.com/@StefanGotteswinter
Comments
Almost 300 AUD 😅
NotAnEngineer
2024-04-07 23:44:19 +0000 UTCHow much of that was spent shipping to Box of Shame, Kentucky, USA?
Jonathan L
2024-04-07 23:15:35 +0000 UTCThanks man! I spent probably too much time figuring out the graphics, but I figured it was the best/only way to get the concepts across. Took me ages to wrap my head around the mechanisms when I first started looking into it. Will have to look into the torsional stiffness!
NotAnEngineer
2024-04-06 22:54:08 +0000 UTCThat's pretty much how all of the PCBWay ads go, if I ever had a reason to use them they would certainly be the first company I would consider.
Adam Gee
2024-04-06 02:29:11 +0000 UTCVery good video ! Appreciate the thorough editing and graphics. Made me smile and laugh the whole way ! Measuring backlash is always difficult, also called virtual play. Best to measure it as a torsional stiffness (which is probably non-linear). But applying the torque with an arm also means applying a force on the rotor ... best way to measure the stiffness is with two (servo) motors and a torque cell ... but yeah, not easy or cheap.
Lucas Koorneef
2024-04-04 14:48:55 +0000 UTCOh, I'll also add that I had a services budget of $800USD, but I paid an extra ~250usd for shipping, and ~350aud for customs duties
NotAnEngineer
2024-04-03 06:52:53 +0000 UTCSo glad to hear this for a whole bunch of reasons. I was late to send off the order, so I didn't have the chance to really use them on the project like I had planned. Also genuinely impressed with what I got from them. Obviously you're free to take this with a grain of salt, as they are paying me pretty well, but I've got no reservations about recommending them. Thinking about using them for potential future merch for the channel (I'd love for it to be something useful!)
NotAnEngineer
2024-04-03 06:50:36 +0000 UTCVery good execution of Incorporating PCBWay. Such a relevant sponsor didn’t intrude on the story and kept my simple mind engaged.
Kym Chapman
2024-04-03 06:39:00 +0000 UTC
