Answers to questions about Commercial Off the Shelf Components (COTS) can be found here.
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Commerical Off the Shelf Components - Answers
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Originally posted by FTC12611Question 1: Is the gripper kit from ServoCity legal to use?
https://www.servocity.com/standard-gripper-kit-b
Question 2: What if we redesign the claw and 3D print, but reuse the servo bracket in the kit, is the modified module legal?
Answer 1: The referenced gripper kit from ServoCity is not allowed. Commercial off the shelf gripper kits are specifically called out as illegal in the Game Manual Part 1, rule <RM02>.
Answer 2: In general, it is legal to remove a single degree of freedom part from a commercial off the shelf multiple degree of freedom mechanism and use the single degree of freedom part in a Robot.
It is legal to use the servo bracket (flat plate with through-holes) from the ServoCity gripper kit in a Robot. It is also legal to add Team designed and fabricated parts to the servo bracket to build a gripper or other mechanism. However, it is against the spirt of rule <RM02> to use the servo bracket and make copies or slightly modified versions of the remaining unused gripper kit parts and build a gripper for the Robot.
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Originally posted by FTC6747Subject: VEX Linear Slides
Q: Can we use VEX linear slides?
https://www.vexrobotics.com/276-1926.html
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Originally posted by FTC9978Subject: Single Degree Of Freedom
Q: The rule: <RM02> Commercial Off The Shelf Parts - Teams may use Commercial Off The Shelf (COTS) mechanical parts that have a single degree of freedom. A single degree of freedom is a system whose motion is defined just by a single independent co-ordinate.
1Does this only apply to COTS or does it apply to anything the team uses.(3D printed and designed by the team)
2If the team would like to design and build a robot arm, with two segments with a hand grabber at the end (maybe even have fingers with joints), is that considered a single degree of freedom because they are separate but connected at the elbow and wrist joint with a servo?
Thanks
A2: A team designed and built robot arm as described is a legal mechanism.
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Originally posted by FTC5598Subject: Servocity Cascading X-Rail Slide Kit
Q: Is this a legal COTS part? https://www.servocity.com/cascading-x-rail-slide-kit
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Originally posted by FTC7253Subject: Mirrors
Q: Rules restrict directed outbound light (lasers and LEDs with mirrors). We were wondering...
Can we use a mirrored surface as part of the incoming light path for the phone camera?
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Originally posted by FTC1999Subject: Servocity Gearbox with Potentiometer
Q: <RM02> states that Examples of allowed single degree of freedom parts Single speed (non-shifting) Gearboxes.
Are the ServoCity pre-assembled servo gear boxes legal, given that they include an external potentiometer (see for instance https://www.servocity.com/cm-785hb-s...earbox#198=8)? They are pre-assembled, and seem like nothing more than en enlarged form of the standard internal servo gearbox.
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Originally posted by FTC4634Subject: Casters
Q: Do either or both of these violate the intent of the rules on freedom of motion on purchased hardware? IE too many degrees of freedom? There are differences of opinion on the intent of the build rules on our team...
https://www.harborfreight.com/1-inch...ing-67060.html
https://www.harborfreight.com/materi...ter-90997.html
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Originally posted by FTC13259Subject: Brake Cable
Q:Can we use bike-brake cable to control the movement of our linear slide? something like https://www.amazon.com/Shimano-Unive.../dp/B0050LUBZ8
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Originally posted by FTC3188Subject: Cable Drag Chain
Q: We would like to use a cable drag chain to manage our wiring and cannot decide if it is allowed. Here is an example of the part that we would like to use:
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
Thanks!
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Originally posted by FTC7802Subject: Linear Actuator
Q: My team needs to know if the Misumi LX-26 linear actuator is allowed. It has no motor, no sensors. We were given the bare actuator and have created a mount plate for an AndyMark Neverest motor. It is readily available for purchase from Misumi online catalog as well as eBay.
https://us.misumi-ec.com/vona2/detai...075270/?Inch=0
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Originally posted by FTC12676Subject: Pan/Tilt Servo
Q: IsPan/Tilt Servo Motor Kit for Pixy (CMUcam5) - 2 Axis Robotic Camera Mount https://www.amazon.com/Tilt-Servo-Mo...J37TR8S48KJMNZ
allowed? it comes unassembled with mechanical parts and two servos.
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Originally posted by FTC11411Subject: Eccentric Mechanism
Would a commercial off the shelf part that has an eccentric mechanism be classified as having a single degree of freedom?The specific part is
https://www.sparkfun.com/products/10398
We know the pump cannot be used as is since it includes an illegal DC motor. The team members disassembled the pump and inspected the parts and how it works. They observed that the main component is an eccentric mechanism attached to the motor shaft so that as it revolves, it moves a plastic part back and forth a little bit causing the pump action. Other parts look to be diaphrams that help move the air around.
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