Archive: 6 posts

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Hey everyone, I'm trying to make a minature reverse-joint walker, shown here: http://img.photobucket.com/albums/v305/DrWasabi/LBP/PartyClawGarage3.jpg I read Gil's walker tutorial, and it really helped me out a lot. Everything seemed to be going pretty good so far, but I keep running into this big problem, like the programming getting real moody on me. I made the body and the back set of legs with no problems at all. I used 4 wobble-bolts for the legs, calibrated it so it did a nice circular running pattern with the feet staying parallel to the ground, and sealed them with a proxy switch so they don't go moving on their own until I want them to. So I copy the leg so I can paste it for the front, so I don't have to worry about re-inputting data. The thing is, when I go to test it, the leg just completely flails around, despite its joint bolts having the exact same calibration specs as its original behind it. I figured if it the wobble-bolts have the same stats it should at least operate in sync with the leg behind it right? I try to re-calibrate the front leg so that it at least makes a sensical walk, but then the leg rotates out of its idle stance by itself even when it's sealed with the proxy switch. I have no idea what's going on, or what to do to remedy this. Can anyone please help? Thanks a lot! Here's some pics on trying to get it to work, the back leg is fine, but the front leg is not: http://img.photobucket.com/albums/v305/DrWasabi/LBP/PartyClawGarage1.jpg http://img.photobucket.com/albums/v305/DrWasabi/LBP/PartyClawGarage2.jpg http://img.photobucket.com/albums/v305/DrWasabi/LBP/PartyClawGarage4.jpg

2009-04-29 05:33:00 Author: OddjobBR Posts: 18

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It must have to do with the fact that your copying it, the only way to really find out though, is by making the front foot by scratch just like you did with the back foot.

2009-04-29 07:09:00 Author: Whalio Cappuccino Posts: 5250

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The problem is that the angle and time parameters on wobble bolts work differently depending on whether the moving part is behind the wobble bolt or whether the moving part is the one the wobble bolt is on. You'll have to adjust the angle and timing independently for your new leg. I think only the wobble bolts connected to the hips need to be altered. Edit : Awesome looking walker by the way. Can't wait to see how it turns out.

2009-04-29 13:22:00 Author: Gilgamesh Posts: 2536

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Thanks a lot guys, I ran into another conundrum, however. This has been happening more and more frequent as I'm fine-tuning the wobble bolts. How I'm doing it is that I let the legs run and then I fine-tune them as they're moving, and once I get to a point that I like where it's going, I rewind back to when the legs are in their static position and put the data in from that point. What's happening is that as I'm putting in data from the static stance, the legs start to uncurl and move by themselves despite the fact they're supposed to be held down with a proxy switch, like it has a bad case of Boneitis. Sometimes even the back leg starts to do it, and I haven't touched those since I got finished with them. http://img.photobucket.com/albums/v305/DrWasabi/LBP/ToadgoesHaywire1.jpg It starts out normally enough. http://img.photobucket.com/albums/v305/DrWasabi/LBP/ToadgoesHaywire2.jpg Then it begins! http://img.photobucket.com/albums/v305/DrWasabi/LBP/ToadgoesHaywire3.jpg The legs bend so wildly that they break the grab switch for the gun, which isn't even in the legs' plane. http://img.photobucket.com/albums/v305/DrWasabi/LBP/ToadgoesHaywire4.jpg They just don't seem to stop. http://img.photobucket.com/albums/v305/DrWasabi/LBP/ToadgoesHaywire5.jpg After the legs curl as far back as they can, the docking platform in the back deploys for no reason, that's also tethered down with a proxy switch, but it's its own switch that's completely unrelated to the switch that controls the legs. Sometimes this even happens if I leave the robot alone for a long enough time. Can light be shed on this matter? Thank you!

2009-04-30 08:31:00 Author: OddjobBR Posts: 18

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A proximity switch, eh? What could be happening is when you rewind, you are losing the switch connection somehow. (That, or it's inverted.) Try reconnecting the switch when you rewind.

2009-04-30 12:07:00 Author: SawronZXZ Posts: 463

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That's really strange. If it's not being caused by the wobble bolt's angle settings I'm really baffled. Could the proxy switch have been set to Directional by mistake? (I doubt it, but it's worth looking over).

2009-04-30 13:46:00 Author: Gilgamesh Posts: 2536

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