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Originally Posted by Nuttyman54
one possible problem here-Rule <S01> (bold mine)
An example of an unsafe design is a shooter mechanism that has a large mass that is stopped abruptly at the end of travel and is at risk of breaking off the ROBOT and becoming a projectile.
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yes! that means your laucher cannot have a 5 lbs sled that the ball rides on, that slams into the frame at the end of its motion at 12M/S. You need something to absorb the impact and limit its travel (foam, another piece of surgical tubing, a spring bumper...)
the issue here is metal fatigue. Ive mentioned this several times for pnuematic shooters - you cant let a pnuematic cylinder slam its end either. Eventually the end of the cylinder WILL blow out and become a projectile.
BTW - another super positive for a slingshot type shooter. A surgical tubing launcher could be very cheap and simple, therefore you could make a robot that fires ten balls at at the same time, fires 5 pairs of two, fires them staggered at 200mS intervals... it all depends on how you load the mechanism before the match.