Class - CAD/Design
At home Self learning
follow this great set of tutorial videos! accomplishing the first 8 is a great way to get off the ground with cad and understand the tools available
Click the following link for the link to the playlist of videos.
https://www.youtube.com/watch?v=WKb3mRkgTwg&list=PLrZ2zKOtC_-C4rWfapgngoe9o2-ng8ZBr
FRC learning exercises
importing nuts/bolts and other hardware from mcmaster-carr
this is an essential concept to learn. Follow in class instruction to built a small assembly that is held together using #10-32 bolts with washers and nylocks.
Make two 1/4" overlapping plates of material in cad
put a hole through them where they overlap
goto insert in the solids menu and import from mcmastercar
find and select the correct bolts, set the type to .Stp or step file and download
Joint the bolt to the correct location
repeat 3-5 for the washers and nyloc (locking hex nut)
Assemble a Custom Gearbox
this is more complicated exercise with many commonly used concepts all wrapped into one. doing this will take Many needed skills such as rewinding the timeline and building parametrically, importing Off the shelf parts from parts suppliers such as CTRE/Rev, importing bolts and nuts from mcmaster, jointing gears together so that they spin at the proper gear ratios, and lightening plates for weight and leaving only critical structure behind.
make a sketch on a plane for a backing plate that starts at 0,0 (the origin point). aprox 3"x 6" but that can easily be changed based on your design later! (later meaning parametric and instantly)
import a motor of your choice, we will be using a ctre kraken x60
extrude the plate 1/4" then unwind the timeline to starting sketch.
now from a corner draw a point approx 2"x2" (roughly size of the chosen motor) and use dimensions to make the sketch lines turn black meaning its a fully defined part of the sketch.
draw a circle at the point that matches the size needed for the motor to mount to the plate flush.
calculate the mounting holes for the motor OR import them and cut them into a sketch that is on the timeline after the motor import.
Choose 2 DP20 gears where the total teeth is 60+, this is only a requirement for this exercise.
use WCPs Gear calculator to set the gears distance https://wcproducts.com/pages/calculator-gear
Draw a line from the center of the motor axle (on the sketch) that is Center to center (Gear Center) length and dimension it so that it cannot change.
draw bearing hole on the next part (for a 1/2" andy mark bearing this is 1.125")
extrude the bearing hole from plate
import your gears and joint them to the points defines on the plate/sketch
TODO: add more gears and make a geartrain.
TODO: lighten/skeletonize the frame plate.
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