Will this arrangement of motors work in real life? I wanted something similar to fullmotiondynamics.com/ ,but with cheaper motors and popular NMRV gearboxes. They are angled, not straight like in their design, so the arms will be perpendicular in comparison to the most popular 6DOF designs, where motors are far from center and use a lot of space.
I don't think the design works that way! You don't get enough Yaw-movement with it. Can't you rotate the drive units so that the axle with the crank points outwards or inwards and the motor points upwards?
Lower ball joints are placed more like in other popular designs. I don't know it works better or worse, just different.
Does the direction of arm lever really matters? In the end, with linear actuators there are no arms, so I think theoretically software should handle this and there's no difference if arms are perpendicular or parallel. They are just changes in actuator length.
I put it like this, because motors are large, and I really don't have that much space to use. I want it as compact as possible. Not even in vertical dimension.
There are bad news from the community... Thanos said: I wouldn't recommend worm gearboxes now that less expensive lead screw actuators are available. The worm gearboxes have backlash and usually are very low efficiency (50-60%). Leadscrew has efficiencies of 85% to 90%, and very low backlash (almost non existent). Google for lead screw linear actuators.
I also saw two problems in your design: 1) Check if the ball joint would allow such large angles as in the video. 2) Due to the 90° mounting you have a torque on the axle of the worm gear. This means that the push rod does not act from above but diagonally on the axle. Only a few gearboxes allow this!
I know about lead screws advantages, but building 6 actuators... with all this wiring mess. In my design I just plug 6 motors with integrated gearboxes to 6 VFD inverters, and all signals to AMC1280USB. Also why are those so f.... loud? I should make sealed casing for motors with lot of grease in moving parts, but I don't think it would help. Worm gears are simple solution and they are filled with oil so shouldn't be so loud.
1. I will make CNC adapters for each ball joint so they will have big movement angle. I don't have a photo of it, but it looks like inverted cone with smaller hole for screw inside. 2. This is something I never put into consideration, because I thought that in every position of platform, there is always some rod being in that 'bad' angle. But now I see from above, that in standard design the pushrods act directly from above in many positions.
Is backlash really big problem? I don't want to sacrifice simplicity and quietness for less backlash. In the end I want my 6DOF more for flying, less for driving. I don't need much precision and small movements.
dureiken: Hi there, it's really quiet here someone could help me for my 6 dof project ? thanks a lot
Aug 8, 2017 15:34:46 GMT
tronicgr: dureiken Hi, Open a thread and I'll try my best to help. A little busy with Kickstarter details at the moment but I'll see what I can do.
Aug 12, 2017 11:57:42 GMT
dureiken74: I just did it
Aug 27, 2017 11:59:06 GMT
fimmy: How's the firmware going?
Sept 6, 2017 8:34:43 GMT
tronicgr: @fimmy I had to put it on hold to finalize the manufacturing of the new kickstarter controllers. I tested parts of it to ensure compliance with the new features and looks good so far. I'll get back to it soon for integration.
Sept 9, 2017 12:52:35 GMT
Theuns: Very nice design.I'm also busy with mine and changing it also to Linear Actuators with 220v Servo motors.I'm waiting for my new controllers from Thanos. If I may ask Do you have any Sketchup files of your design and willing to share it I Thanks Theuns
Sept 14, 2017 22:45:09 GMT
atayeu: Hey everyone! I'm reading up and gathering all of the intel I can find for my first motion platform. this is by far best information for creating one.
Oct 14, 2017 7:25:57 GMT
tmcnam: I must be crazy but I still can't find the blueprints to the platform by GA-Dawg. Any help would be appreciated. Thanks guys.
Mar 10, 2019 21:31:57 GMT
Trip Rodriguez: Sorry tmcnam, the shoutbox doesn't get much attention. Did you find the blueprints? They are at the VERY bottom of the extremely long first post. It says "attachments: 6DOF.zip
May 4, 2019 19:13:25 GMT
zivby: How much weight this setup can carry?
May 19, 2019 11:57:16 GMT