Crumbs! (And Friends) - Team Manuva's Antweight Build Log

11th May 2020, 20:32

I've attached a couple of pictures of it I took at RoboNerd 2018

Jamie, you absolute hero! I was struggling quite a bit with that, that helps out massively. Thank you very much for the info!

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Crumbs

Thank you for all the kind words, everybody. I'm afraid I haven't started the shuffler yet, but I have been focusing on making Crumbs a bit more interesting than just a wedge. I wasn't happy with how cramped it was inside the bot and wanted to make space for a servo so I could incorporate a lifter. I wasn't too happy about it, but I tried moving the wheels to the outside.

Crumbs MK2.JPG Crumbs Modified CAD.JPG

This new design incorporated new individual motor mounts, plus mounting posts in the back panel and lid for a power switch. Print time!

IMG_20200504_080620.jpg IMG_20200504_080630.jpg

Ok, so:

Positives

Motor mounts fit perfectly

Negatives

Wheel gaps are too tight and exposed
Not much extra space
Print quality is awful.
I absolutely hate it.

After a few days of swearing at SketchUp, I came to the conclusion that I had lost all sight of what was good and bad within the project, so I scrapped it and started again.

The following result was an improvement:

Crumbs mk3.JPG

Finally, some steps in the right direction! Can we guess what the next steps are?

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..If you guessed "Scrap it again and start learning a different CAD software", you would be absolutely right!

Yes, I downloaded Fusion360. I initially used SketchUp from it being the only free software I knew of, but when I was told that Fusion was free for hobbyists, I signed up immediately. It took a day or two to get used to, but over the course of the weekend I ended up with the below:

unknown-1.png

Much better. This design includes enough space for all the electronics, plus a servo. With the layout of the design, the servo gear can be used to drive a lifter, axe or grabber, depending on which opponent I am fighting.

IMG-20200510-WA0003.jpg

Above: first test print. Below: Weigh in with all electronics fitted.

IMG_20200510_200612.jpg

Still not quite there yet, it still needs a lid and a weapon. The chassis itself needs a few tweaks too, like lowering the walls of the motor mounts and including posts for screws, power switch, etc. With only 22g remaining, I may be a bit pushed for weight, but hopefully I can work around that.

All in all, very pleased with how it is going!