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This video covers how I designed the linear actuators that make up the legs of Jugglebot's stewart platform. It begins by looking at the most important decisions you need to make when designing your own linear actuators (speccing the motor and ball/lead screw) and then explores some more qualitative design considerations that should be made when building a linear actuator.
Apologies for weird audio in some parts; there is construction going on in the building I'm in and I haven't been able to fully remove the audio artefacts caused by this.
Links to resources mentioned throughout the video:
Helpful threads on the XSimulator forum:
1 - www.xsimulator.net/community/...
2 - www.xsimulator.net/community/...
3 - www.xsimulator.net/community/...
Ball screws vs. lead screws:
www.helixlinear.com/blog/lead...
00:00 - Introduction
01:09 - Video Summary
01:38 - Motor and Ball Screw Analysis
02:14 - Speed Analysis
06:59 - Power Analysis
12:33 - How to Actually Make Use of This Analysis
15:19 - Qualitative Design Considerations
15:28 - Force Transmission
16:47 - Bearing Choice
17:57 - Choosing Number of Guide Rods
19:39 - Position of Limit Switch(es)
22:31 - Supporting Free End of the Ball Screw
23:50 - Attaching Ball Joint to Push Tube
24:47 - Choosing Joint Types for Stewart Platform
27:10 - Final Remarks