Does anyone know of an online CAD library of old FTC robot designs? In particular, I am looking for examples of how different drive trains are put together so we can explore (a) how to use the CAD software (it is a bunch of CAD newbies, including the mentors) and (b) the strengths and weaknesses of different type of FTC drive trains.
We’ve got a couple of the kids working in Creo Parameteric so far, since it’s free. If you have any pointers to the easiest-to-follow online tutorials for it, we’d appreciate that as well. Local CAD mentors have not materialized, yet, though we are looking… thanks!
Thanks - we found that one (“pin”), but no one could figure how what the second constraint that Creo was asking for should be. Then, when they got a second constraint to connect (not sure which one), it was not obvious how to test that it could move. Online videos show a gear (for example) just being grabbed with the mouse and it spins freely, but we were never able to duplicate that behavior.
We also looked at how to link two gears together, and think we figured that out (sort of), but haven’t been able to test it due to not being able to make parts move.
When I build at least, I create my frame of the robot and what-not. When I want to get into the wheels and gears, I do the following. From there I take a gear, and I set it to Pin, and align the hole of the frame and the centered gear and the face of which I want touching/facing the frame. From there I build off the gear, i.e. wheels, axles, collars. If you set your gear to pin when first placing it, it should only move the gear, and whatever has been “attached” to the gear when you hold alt and ctrl.
I load a C-channel piece.
I load a gear.
I select “pin”.
I click on the center of the gear, then the center of one of the C-channel holes.
It lines up, says “coincident” on the middle of the gear.
Status at the top says: “connection definition is incomplete”
Where do I go from here? If I switch back to “user defined”, it lets me click the green checkmark and says “partially constrained”, but the gear will not spin around the axis.
Ah, this was exactly the problem (at least for what I was experimenting with - not sure about our team members who were having the same issue). I was able to pin two gears on a C-channel and have them properly driving each other within two minutes of reading your explanation. I will share with our kids right away.
They are also watching the Creo training seminars (RoboTalk), so hopefully we can get up to speed in a reasonable mount of time.