Maybe I missed something, but why not just design it so that the flipping arm is also the self righter?
I thought about using friction drive for a second set of wheels but quickly decided against it since I figured as t he tyres ware they will no longer touch each other and any debris will jam between them.
The first version of Liftoff had no problems with self-righting because as you said PJ, the design of lifting arm acted also as a self righter...but there were also disadvantages to that design.
The hinge point was at the very edge of the machine and the ram was vertical, the recoil caused the robot to flip upside down when it missed the target. And to be able to self right properly I had to decrease the usable pressure to around 7bar or less as otherwise it would somersault and end up upside down again!
So I redesigned the system placing the hinge mid-way on the machine, and with the ram in horizontal position hoping to eliminate the tendency of the machine to flip upside down when it misses the target.
I could try to redesign the the flipper hinge so that it would travel further up and act as a self righter - but I fear it would be in a too much of a mechanical disadvantage
Most of the flippers throw themselves over when they miss a target. Wouldn't an easier option be to not miss?.....
Wouldn't an easier option be to not miss?.....I'll try!
Received more parts today, miniature 2/5way valve and Qev
I finally got most of the parts I will be needing for the upgrade - the design is still not final, but I've got some new parts with which I should be able to make all things work... just need some time to get going with it now!
looks good
Final changes to the design ready... Changed the flipper hinges to a simpler piano hinge type, I'm assuming it will be up to the job! It shall be a medium duty 4mm pin hinge.
The self-righter mechanism was the biggest headache - but I think I have a simpler more effective system now...took some advice from posts on this build and came up with a Linkage/Slide/Cable system... from its description, it does not sound simple at all!
In theory it should work...now I just hope that in the end it does its job! :wink:
These are the parts, two links and the slider. The slider is pulled by a cable connected the the flipper arm and slides down the guide, then returns back by means of two flat power springs.
Slider parts: Slide and cable, power springs, guide.
Thats awesome! I can see that working wonders, though you will have to check the cable after every fight. Your Sketch Up work is superb to, you aught to move over to Solidworks or Autodesk; even blender might do it. It would make your life so much easier.
Yeah, I'm a bit concerned about the cable snapping at the end swage, but I guess I'll only get to know after testing it
Been using sketch up for quite some time so I got used to it - though have to admit that it makes me swear sometimes! Mainly use it as its free!!
Hi, your robot looks epic. By the way, what size wheels are you planning to use?
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