Due to an increase of spam on the FTC forums, new user accounts must contain:
1. a valid email address
2. a reference to a valid FTC team number
3. a valid location (city, state/province)
New accounts will be manually verified before users are able to post to forums.
Please Note: Game Q&A forum posts must be made using the forum login and password assigned to your team. The main contact for your team will find your team credentials on the Team Summary page of your TIMS account.
We are very sorry for the unavoidable delays that manual verification creates. Thank you for your patience.
I have just received an email from LEGO stating that their small and medium sprockets are on back order until January. We have our first tournament on Dec. 8th. Are we allowed to purchase the following sprockets from McMaster Carr http://www.mcmaster.com/#roller-chain-sprockets/=k9ewmh to use in their place. We are in desperate need of these of sprockets to complete our robot.
A: Due to the issues with delivery of the small and medium sprockets, FIRST has decided to allow teams to purchase sprockets from alternate suppliers. However the sprockets must be functionally equivalent to the Tetrix sprockets (same number of teeth, and pitch). The sprockets may be made of steel, aluminum, plastic, etc.
Reynobond is an aluminum composite material. It is raw material that consists of 2 sheets of thin aluminum with an extruded thermoplastic core which is 4mm thick. A plywood like material for metal. (http://www.alcoa.com/aap/north_ameri...sp?cat_id=1756)
The team would like to use it in place of plate aluminum.
Q2: Are non-Lego pneumatic pistons allowed as linear slides provided they are not being actuated with compressed air? (used explicitly for the sliding motion, not using compressed air and a solenoid to actuate) http://www.smcpneumatics.ca/en.aspx
Q3: Are rack and pinion assemblies allowed providing they are used only for the sliding motion and not exploiting the rack?
A: Q1: Lift supports are not considered linear sliders and may not be used on the robot.
Q2: Non-Lego pneumatic cylinders are not allowed on the robot, regardless of their intended use.
Q3: Commercially available Non-Lego and non-Tetrix rack and pinions are not allowed regardless of their intended use.
We have a 3D printer that we had repaired and they replaced the lead screw and nut for it that raised and lowered the tray that the 3D parts were built on. Can we use the lead screw and compatible nut on our robot per rule 4.2.2 <R02> A3 "Lead Screws and Threaded Rod plus Compatible Nuts"
A: There are no rules restricting where a legal part may be acquired.
Our team has read through this forum and what classifies a "bearing" and it was talking about how the supplier classified their product. We are looking for some general clarification along with a specific part
Q1: If in the description it describes it being composed of a bearing but is not titled such, is it legal?
Q2: If a product uses a trade name, but is evidently a bearing, is it legal. An example would be a "deck organizer" in sailing, it is comprised of a few bearings but has an application specific name, or a "traveler" it is clearly a linear slide but is not called such.
Thanks again for clearing up everyone's questions, it clarifies the rules immensely!
A: Q1: Just because an item contains a bearing does not make it a legal part. To make it easy for the Inspectors to determine the legality of a part the rule is that the part must be sold as a "bearing". It is the simplest way to insure consistency across the large number of FTC events.
Q2: This question does not provide enough information to make a ruling. Please provide a link to the product description.
Q3: This part is a pulley that contains a bearing and is not an allowed COTS.