Random questions about drivetrains

  1. Why are 4 inch wheels not viable?
  2. Are 8 wheel drivetrains viable?
  3. Why does nobody use high strength gears?

This could go for any completion not particularly high stakes.

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  1. They are viable, they are just bigger, meaning that the drivetrain and center of gravity will tend to be higher. Good for some games, not so much for high stakes. It was excellent in Over Under, for example.
  2. Yes, they are, however many people use 6 or 4 wheel configurations to save weight or space for packaging.
  3. Lots of people use high strength gears, not sure where this is coming from, however the primary reason to use low strength is it allows for thinner drivetrains.
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  1. 4 inch wheels are viable although not commonly used
  2. Yes they are many teams that use them
  3. Who said that teams don’t use high strength gears? Many teams do use them although they usually cut them in half.
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For number 1 4 inch wheels can be used as we don’t have smaller wheels.
For number 2 8 wheel drivetrains are very game dependent and are not always viable.
For number 3 high strength gears take up to much space typically.

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They don’t have many competitive gear ratios (only one viable ratio above 60 in/sec, which is usually the minimum for viable gear ratios).
Plus they’re big (bigger profile = harder to make cross braces and stuff like that).

Yes, a lot of teams use 8 wheels.

Quite a lot of us use high strength gears since some sizes aren’t offered as low strength gears (like 24t, 48t, and 72t).
Usually we opt to use low strength gears wherever possible as it makes for a thinner drivetrain and hence more room in the middle of the robot for all the fun normal mechanisms (like intakes, mogo clamps, catapults, etc)

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The reason I thought not many teams used high strength gears is because most drivetrains I have seen use low strength gears for 3 hole gap.

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somewhat similar question- is there an advantage of using 3 or 4 wheels per side (instead of just 2), if you’re not using center traction? I see a lot of teams doing this, but I’m not sure why.

3 HOLE GAP!!! there’s no way! the smallest anyone can get is 5 hole with ls gears.

3 hole gap is very possible because you can fit an Omni wheel and a low strength gear in 3 holes. Here is an example of what it might look like:

Many teams use 3 hole gap to have thinner wheelbases allowing for more space in the rest of the robot.

What he means is the gap between the C-Channels of the drive is 3 holes, so when you include the c channels it is a 5 hole wide drive pod.

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oh ok, I though he was talking about 3 hole including the outside

but nice cad, super clean, did you make this yourself?

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Oh mb yea having 3 holes including the outside is impossible. Not my CAD, I wish, just some image I found online.