2018:Robot Design Details
Overall design decisions, notes, specifications, and integration items here! Integration Task List (needs link)
Overall Robot Dimensional Restraints as of 1/11/2018
After a coordination session with mechancial subteams we reached the following dimensional guidelines for all subteams to keep in mind. Sketches (hopefully) to be added Thursday:
- Drive Base:
- We will be a narrow bot with our CUBE intake side(s) being 27.75" and our ramp deploy side(s) being 32.75".
- We may be a "U" or "H" or solid rectangular drive base frame. We will have a decision on this by Saturday night. In the meantime, drive base is focusing on the side rail design.
- The battery will be located in the back of the drive base.
- Bottom Clearance is 1.25 inches,
- Top of Drive Base is at 4.25 inches with total gear clearance at 4.83 inches.
- CUBE Mechanism: Please note, this section breaks the CUBE mechanism into FOUR parts: Intake ("touch it own it"), Stabilizer (holds the CUBE firmly in an orthogonal orientation), and Arm (moves the CUBE), and Outtake (CUBE exits the mechanism).
- Following bumper rules, we have 15.75" of width for all parts of the CUBE mechanism that rests against the drive base frame. All other parts must deploy over the bumpers.
- CUBE mechanism must comply with 16" extension rule (be careful with pivots!).
- "Going Thru the Robot" with the CUBE creates three possible pinch points:
- A CUBE mechanism with a fixed Arm (that has the Intake/Outake/Stabilizer attached) rotating 180 degrees from robot front to robot back creates an arched ceiling underneath it that the ramp storage must fit under for the width of the Arm/Intake/Outake/Stabilizer.
- A CUBE mechanism with any Arm design rotating 180 degrees from robot front to robot back creates a path through the center that nothing else can occupy.
- A CUBE mechanism with any parts that extend outside the drive base require space to store those parts in the Start Configuration that could impact ramp storage.
- If the CUBE Arm has 1 pivot point (at the base), in order to rotate 180 degrees with Intake and Outtake of the CUBE at the floor (13" CUBE orientation is min on the floor front and back, 11" CUBE orientation is min on the floor front and min. 1" off the floor back) then the centerline of the Arm is approximately 6.5" off the ground.
- If the Arm has 2 pivot points (at the base and one creating two segments) this constraint may not apply.
- If the Arm has 2 pivot points and the Intake/Outtake/stabilizer articulates at the end of the Arm, this constraint may not apply.
- If the Arm has 1 pivot point and the Intake/Outtake/Stabilizer articulates at the end of the Arm, this constraint may not apply.
- If the Intake/Outtake is attached only to the drive base and the Stabilizer is on the Arm, this constraint does apply. Please note in this instance the ability to Outtake into the SWITCH may be compromised. It also implys that we are duplicating the Outtake or designing a second Outtake to deploy the CUBE at the front and back of the robot.
preliminary actuator chart
|group||task||motor (y/n)||type of motor||number of motors||pneumatics (y/n)||links|
|intake||grabs the cube and puts it in the hand||yes||?||2+||?||see cube meachanism|
|arm||pivots hand around the robot||yes||775 pro||?||no|
|hand||holds the cube as it moves around the robot and deploys the cube||yes||775 pro?||1||no|
|ramp deployment||puts ramp on the platform||?||775?||?||no||see end game mechanism|
|ramp raise||raises the platform||yes||775 pro||4||no||see end game mechanism|
|drive base||moves the robot||yes||cim||6||no||see drive base|
On 1/10/2018 time trials were conducted using past years' robots to determine how much driver control affected timings for picking up a CUBE and getting it to the EXCHANGE. Picking up, driving backwards and delivering the CUBE to the EXCHANGE was compared to picking up a CUBE, turning 180 degrees, abd delivering the CUBE to the EXCHANGE.
|2016||2017||AVERAGE||16" FP Extensions|
|180 Degree Turn||53||47||50||42|
|Back & Forth||35||33||34|| 27|
Robot Overall Design Info
|group||task||motor (y/n)||type of motor||number of motors|| pneumatics(y/n)
|intake||grabs the cube and puts it in the hand||yes||?||2+||?||see 2018:cube meachanism|
|arm||pivots hand around the robot||yes||775?||?||no||
File:Copy of Arm Design.pdf]]