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Unread 03-11-2015, 00:08
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GeeTwo GeeTwo is offline
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AKA: Gus Michel II
FRC #3946 (Tiger Robotics)
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Re: Help - Can't figure out way to connect spool to webbing

It's great that you're lifting now!

BTW, what is the ratio on that gearbox, and how many game pieces are you looking at lifting at a time? We geared ours down 8.45:1 (KoP equivalent gearbox), then another 32:15 (2.13:1) with chain, and drove that on a 15 tooth #35 sprocket. As I figured at the time, we had a theoretical 40A lift force of about 250 lb and a free lift speed of 2.3 ft/s. That speed seemed like plenty, as we would rarely be lifting more than a foot at a time, and we wanted to have plenty of surplus force so we could get a load of six totes with RC moving with authority. As you appear to have about a 2" sprocket, you'd need a gearbox somewhere around 30:1 to get the same force and speed.

As it turned out, we rarely lifted more than four game pieces at a time, but it was due to our inability to form interlocked stacks, not our lift that limited us.

Quote:
Originally Posted by Sperkowsky View Post
We have hinged lexan plates. Indiana clips were our first choice but hinged plates allowed us to use just gravity.
The longer I'm involved with FRC, the less likely I am to count gravity as an ally beyond providing normal force for wheel traction. Don't just carry game pieces; hold them.
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