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Re: Robust way to rotate an 18 inch square plate 90 degrees.
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The FIRST servo rules have relaxed significantly in 2017 (after a significant relaxation in 2016), so you may want to re evaluate the compliance yourself. IIRC, the only servo specific requirements this year apart from how you power and control it (R36) are that it have a retail value under $75 (R32). Edit: When setting up pneumatics, you should make sure that your mounting gives you good leverage at your angles of greatest load. For lifting a plate/box around a horizontal hinge, the cylinder should be pushing (or, less optimally pulling) just about straight up at the bottom of the stroke, but can be at a relatively shallow angle (e.g. 30 degrees) at the top of the stroke, because the CoG isn't rising very much there. Going the other way will require a much larger cylinder that will slam the plate to the top of the travel because it is overpowered there. |
Re: Robust way to rotate an 18 inch square plate 90 degrees.
I guess my message didn't get through! Pneumatics is simple. Really simple. Way simpler then levers, cams, linkage, motors, transmissions, belts, gears, etc.
Seriously...spend an hour, learn pneumatics, you will know all you need to know to make things move easily and quickly. |
Re: Robust way to rotate an 18 inch square plate 90 degrees.
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Re: Robust way to rotate an 18 inch square plate 90 degrees.
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Re: Robust way to rotate an 18 inch square plate 90 degrees.
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Re: Robust way to rotate an 18 inch square plate 90 degrees.
A pneumatic system is defiantly the way to go, one piece of advice that is relevant for most mechanical sub-assemblies, is try to reduce the amount of work an actuator has to do. This is especially relevant for heavier loads (i.e. 10 lbs). Use latex tubing, springs (make sure you wire them!) and gas springs to help reduce the experienced weight on an actuator, and torque/power required. Not only will this technique cut down on wear and tear, but it adds some level of finer control. Just be careful with large preloads! ::ouch::
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Re: Robust way to rotate an 18 inch square plate 90 degrees.
Thanks for the great tips. Really appreciate it.
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