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Post by blizzard on Feb 27, 2015 20:58:59 GMT
Hi all, I was inspired by the motion platform construction of Billo's 6DOF and built a model of my planned motion platform. The platform will have a size of about 3,00x2,50 meters. Do you have experiences in relation to the rods end where the lever connect. Which are the best distance between the two rods of each site? Surely the movements of the model platform aren't very exact, because I'ven't swivel heads, but metal eyelets with space. Insofar the movements are a little bit awkward by hand. Is it realy a smooth and exact movement with the real gearmotors in combination with lever and swivel heads controlled by software and Thanos boards? What's your experiences? My three-phase gearmotor (1,1KW/15U/min-456NM) in combination with Hitachi WJ200-015HF and Thanos board is working very well and synchronised by X-Plane too. An additional question. Are there any difficulties in relation to to synchronization of the respective pairs of motors in connection with the platform and transmitting the force? Will it be all controlled by the software (in my case Ian's software), that there is no action of the motors against each other mecanical? Rolf
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Post by tronicgr on Mar 2, 2015 20:04:59 GMT
Hi Rolf,
You can compare Fabi - Stevant - Billo's platforms to get an idea what is the effect of diffent distances between the rods. The software considers this as a single point so it makes sense to place them as close is possible (The inverse kinematics model is after a bottom triangle and top triangle).
After you are satisfied with the mockup model (enough travel or angles), you will see in the real life model that there is not going to be any conflict between the each motor mechanics. The software and electronics are cooperating to achieve safe positioning of the motors.
Thanks Thanos
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Post by blizzard on Mar 3, 2015 9:22:11 GMT
Hi Thanos,
thank you for the informations - this will help me in the further development of my platform and it's more clearly now.
Rolf
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Post by fabi on Mar 16, 2015 13:48:05 GMT
Hello Rolf about <<there is no action of the motors against each other mecanical?>> The magic and advantage of the hexapod is that you can move a single motor without it affects the others. Here you see a nice demo: www.youtube.com/watch?v=oeHp5D9910gThe only part you need to take care are the limits such as angles from the junction etc. what you can configure in Ian's software.
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Post by blizzard on Mar 18, 2015 16:21:41 GMT
Hello Fabi, yes, I suspected it, that the movements of the six motors are depending on each other. I've found by my muckup also, that the junctions, especially the angel of the junctions are the limiting factors. Below I've attached some photos of my mockup. First you can see the platform in low level horizontal. There are no problems with the junctions and lever. Next photo shows the platform tilted backwards (pitch like take off) and there are no problems with junctions, lever etc. Then third I tilted the platform to the left - oK- and moved the exzenter/lever only of the right gearmotor. in front up(the 5 other gearmotors not moving), then I get problems with junction angels und lever because it begins to jam. I'm not shure whether it's impossible movement of a single motor in real in combination with Ian's software, means it's closes off or would it be possible in real if the junctions would have a greater angel of movement? Rolf Attachments:
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Post by abtools on Aug 28, 2015 15:20:30 GMT
Hello Rolf, your platform design with these swivel heads and fork joints (you showed in the Torque requirement thread) looks really interesting! I'm very curious how your project evolved since then: do you have an update or maybe a video of your current project status? Best regards Andreas
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Post by blizzard on Aug 30, 2015 20:10:49 GMT
Hello Andreas,
the construction and development of my motion platform I didn't advanced tately, because I've to prepare the room for it. The room will get the size of about 16 m² and a hight of 4,50m. It's a lot of work, because I've to reduce my workshop and to set up news walls, a special floor with a load capacity of about 1,5 t and lay the electric system etc. I think it will take a lot of time. Maybe the real construction of my motion platform and the B737NG Cockpoit shell will start again next summer if everything goes well.
regards
Rolf
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