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A harmonic drive is a gear reducer that uses an elliptical drive inside a flexible spline, with a slight difference in tooth count such that each engagement of the rotating drive forces the spline rotate the opposite way. Because the drive is sn ellipse, there are always two points of contact between drive and spline, so backlash for many applications is considered to be nil. The reduction ratios can be huge. I have 50:1 on my CNC 4th axis and even with NEMA 23 stepper powered, the chuck resists torque way beyond what I need and allows micron level step precision, even in the event of a dropped step. I hope this helps. John
This is excellent! I am building an enclosure for an old, salvaged harmonic drive that did not use crossed roller bearings as modern ones do. Very difficult and expensive to find a match. Until now!Thanks for doing this, and the Fusion video is outstanding.John
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Thank you for this excellent instructable. I plan to build this. I'll start with the battery powered version, may or may not progress to the power supply option.A couple of questions. Sadly my existing drone batteries are too low capacity, so will have to purchase for this project. Any suggestions on capacity and discharge rate? I see you used XT60 connectors, some of the battery options use a T connector. Are there advantages to the XT60 for this project?If I do wander toward the power supply route, I read lots of observations below on the variac. I see references both to isolated and to simply fused (not the same of course). Is isolated required for this application, or is fused enough?ThanksJohn
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