Good afternoon, Chief Delphi! This year is our team's first year doing servos, and we're unsure about which one to get. We're thinking about using a servo to position the shooter mechanism (about 60 degrees of rotation). We figure we'll need about 1.5 Nm of torque for that. We also need one for a "boot" mechanism to push the boulder into the shooter mechanism, which will need considerably less torque.
We've got quite a few questions that we thought would be best to post here.
- We've made a spreadsheet with some options (https://docs.google.com/spreadsheets...t?usp=sharing). What are we missing? Which are the best models to use?
- What are the benefits of a "metal gear" servo? A "ball bearing?" servo? Is it worth the extra price? What other factors should be considered besides torque and size?
- It seems advisable to hook the power up to the VRM instead of the roborio (for current reasons). Is that legal?
- It's also an option to gear down a bag motor and use a potentiometer in a PID loop. Is that a good idea?
- How does one adapt the servo output onto a normal old hex shaft?
"What's this on the floor? 'Team 71 2005 strategy and design notebook'?" 
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