Question... When I'm using a V-belt, should I cut the groove on the pulley a bit deeper than the belt's height?

Absolutely! The pulley depends on the wedge action of the sloped pulley sides for grip.
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Australian 2015 Featherweight champion
UK 2016 Gladiator champion

Yes, the groove is a tad deeper than the belts hight.
You want the flanks of the belt to have full contact with the sides of the groove to spread the load and have the most grip possible.

Thanks guys.

I just searched specs for xpz pulleys and found that in addition to the grooves being deeper, the grooves also have a different included angle than the belt. (belt is 40, grooves are from 34 to 3 How did they determine the angles?

The pulley angle depends on the diameter. As a belt wraps around a smaller pulley, its inner edge gets more and more compressed and deforms outwards, while the outer edge with the reinforcing cords stays the same width.

This makes the sides of the belt change their angle as the belt bends around the pulley and the pulley cheeks have to be adjusted to get enough grip.

As the pulley diameter increases, the belt deforms less and the cheek angle can be closer to 40 degrees.
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Australian 2015 Featherweight champion
UK 2016 Gladiator champion

Ah I see now. Thanks Nick.

That is the reason polyVbelts are developed. A small V belt can run over a smaller pulley . And having a lot of V's next to each other copes with the grip. Force is dealt with the outside of the belt, were the cords are.

Ah can't believe I forgot those lol.
Micro V belts are pretty nice. The only problem is tensioning... Due to space constraints, my tensioner is probably going to be narrower than the belt itself (both for V and micro V), I wonder if that would cause the belt to slip to one side...

The tensioner can be a piece of teflon solid mounted to a bit of frame.

I don't have any tensioner - I just machine one of th pulleys down until the belt just fits
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Australian 2015 Featherweight champion
UK 2016 Gladiator champion

only when you have a lathe:D

I'm probably going to have a swinging arm (which I already have in the current design, but I forgot about it cuz I never used it), and a piece of teflon/ a bearing at the end as my tensioner.

After being addicted to pubg for two weeks, I finally realized that I still have to complete designing a combat robot.

I decided to use PJ-sized belts (multi-v) since a lot of my friends in China have been using those with good results. The center section of the spinner has been slightly strengthened. This is where the bot stands for now.

EDIT: oh and I forgot to change my weapon motor pulley to micro-V.

Some changes I forgot to mention in the last post:

Removed the side bearings as I already have the sides of the wedge as support when the bot gryodances. This allowed the even spacing of the wedge mounting holes, and released me from the pain of getting my OCD triggered.

Added a recess for the tensioning device on the top cover. (not having enough room for the head of the mounting screw was one of the reasons why I didn't have a tensioner in the last build, aside from not needing one.)

I made the top of the drive motor cage thinner so that I have more room for the drive ESCs in between them.

and 2 motors? cray man, looking good mate
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Thx. The design was meant to have two motors from the beginning, however in the last build I didn't have the space for the second ESC. Now that I have enough space, and the weapon is finally worthy of being driven by two motors, I expect carnage in my next event.