Possibly OP Motor Sharing Mechanism

VEX V5 General Discussion
21

Oh lol. I had forgotten about that

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Nice build and video Taran!

Hmm? What?

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Dont worry about it @Noah10851B

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Nice! Just curious as to how much strain is put on the motor when changing directions, but other than that, I really like it.

Iā€™m just wondering since Iā€™m planning on doing something similar, where the motor needs to change direction just as much.

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Well thatā€™s a very nice and clever design, but with three ratchets, it will generate as much noise as the amount of data saved by your re-run program :slightly_smiling_face:

Making it, possibly, one of the most annoying robot designs out thereā€¦

And where there is noise - there is energy loss and additional load on the motor that reduces effective power output for the flywheel.

Edit: Forgot to include an obligatory link to Ratchet Master Class from 315G

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@technik3k brings up a good point. Perhaps something like this could be a more efficient solution to make the shared mechanism spin in only one direction.

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Motor sharing is always a good way to score points with judges while making good use of motors =) . Double ratchets can be very useful in games like this where you only need things to rotate a certain way.

In Turning Point we had a similar concept with our flywheel bot, where we used 2 motors to power a 2-motor flywheel, an indexer, and an angling hood. In total, we used 7 ratchets :smile:. However, Jacob designed some pretty nice custom ratchets so the bot was nice and quiet.

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image1200Ɨ675 819 KB

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Can you share this? Iā€™m intrigued.

29

pretty slick custom ratchets.

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Yep, itā€™s all explained and linked to in my post.
You can even find the link to the online challenge entry and CAD files :wink:

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Wait, thatā€™s 3D printed. How did you make it so that it was VRC legal?

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looks like itā€™s polycarb.

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The entry for the online challenge was a 3d-printed part, yes. However, for our robot we used stacked layers of lexan.

Fun fact, 6 out of the 7 ratchets had 3 pieces of hand-cut lexan layered together. You do the math to find out how much time that took jacob to cut :sweat_smile:

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I donā€™t even need to. Iā€™ve seen layered lexan done other places, and I know how long it takes.

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I am interested in seeing if anyone can design/build a ratchet using a 36T gear rather than a 60T gear.

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Here is a demonstration of the ratchet gear:

On our robot, we used 4 of the half-cut pillow bearings instead of 2, which made the ratchet able to withstand a lot of force (while still being quiet). This was needed for our flywheel which could accelerate quickly with 2 motors, and with only two points of contact the ratchet would sometimes cause the pillow bearings to collapse.

If you look at the picture of the bot above, right here:

image

there are two opposing ratchets facing each other, which was quite impressive space management.

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I designed a low precision ratchet quite a while ago that was able to fit within the profile of a 36 tooth, (leaving all teeth available to mesh and turn with another gear) but took up quite a lot of shaft length, not nearly as compact or as precise as Antichamberā€™s however

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