Is a 6 bar a good idea?

I think a dr4b would be better. it can reach high tower and stack easily. it also eliminates the circle motion and the end will go vertically straight up and down. i haven’t read the rest of the thread but if you can just do a dr4b

We don’t have that much build experience.

Ah, if you don’t have too much experience a six bar is fine. there isn’t really a downside to having a six bar.

This is only my 2nd year, my teammate has experience but likes to cut corners.

In ohio, most robot aren’t done yet, I think I can do good with the 6 bar for this competition, but when we go to blue jackets, we might improve or change it.

Too bad there isn’t a step by step tutorial


Our 6 bar is too heavy, we are going to switch to the big gears and red cartages also loose some weight on the intakes.

if it is your arm u should use the big gears but if thats done rubberbands should fix your problems and dont do red if u dont have to it will slow u down

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Red is usually necessary for lifts as its the only way to get enough torque to lift an arm

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We going to do that… Wish us luck…

Not really. as long as it’s geared externally for 7:1 or 5:1 it should be fine. Especially this year when lifts are converging to only hold an intake and a cube, there isn’t really much need for red inserts unless you are using a heavier lift like a DR4B or Scissor lift.

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I’d disagree with this. a 1:7 or 1:5 on 100 rpm is still decently fast, and has a good amount of torque.


1:7 on with a 100 rpm cartridge has less torque though. I think it’s better to make lifts as fast as possible, because speed is very important late season.

this is the highest torque you can get without using a compound gear ratio though…

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When measuring torque you calculate output teeth / input teeth.

That actually depends on who you ask on this forum. We still haven’t come to a final conclusion :stuck_out_tongue:

Edit: True for calculating torque. But when asked how a gear ratio is written, the forum users are divided

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I always put my driver gear before my follower gear. so 1:7 would be 12 tooth gear as my driver, 84 tooth as my follower

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I say 1:7 (input:output) because it makes more sense and sounds better but…
It’s technically output:input


always trust

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This is not the best approach, because while most properties of a gear ratio are measured as out/in, speed is measured as in/out, so using one format could be confusing.