Do you think a compound ratio like a 3:1:5:1 could work for a one motor dr4b?
If you are doing that compound ratio with one motor, I would consider this to be the most recommended way. The reason why the 36t gear is in the middle instead of 60t gears is primarily because there will be less torque applied to the axle, and the 60t gears on the lift would offer more support, rigidness, and height.
if youâre using a HS shaft, would it be acceptable to connect the follower gears across, rather than the drivers?
This is why:
This is why it would be better to connect both sides using 12t HS pinions instead of the plastic gears. The reason why I think @MasterCole 's suggestion would be an exception is because the torque is only a 1:3 gear ratio, nearly half of 1:5 or 1:7.
Edit//: I had to replace my gears twice on my Turning Point cap bot.
hmm I understand. thanks, may have to reconsider my lift gearing.
I understand why a normal shaft on the driver gears is better, since it has less torque getting transferred through it, but will a normal shaft not twist at all from transferring one 100 rpm motors worth of torque across a large gap?
Looks at all of the low strength axles I have turned into drillbits
Sees 3674Râs âdrillbitâ from last season
Sees my puncher robotâs tilter mechanism nearly break from the torque of 1:1 100 RPM motor extending an axle across a large gap
I can confirm, 100 RPM motors are STRONG as heck, and they will twist a low-strength axle like nobodyâs business even at a 1:1 gear ratio. 
not to entirely derail this topic, but one last question:
what is the best way transfer power from one side of a lift to another? HS shaft on your driver gears? that wonât exactly work, since all my 12T pinions are the ones with the 1/8" shaft holes, so no HS shafts on those lads. would using HS lockbars on my follower gears prevent them from getting stripped?
You can always get a solution by adding more. So if you have like 3-4 lockbars it should work. But I would suggest replacing the lockbars every 2-3 competitions.
Would the HS axle by any chance twist under high loads? Iâm thinking of lifting at least 7 cubes with one motor with a tray lift.
The original post says that this is the fourth robot, what were the last three and why the switch to a tray lift (if there was a change in design)?
we were running out of regular c channels.
currently there is a lot of steel stuff on our robot. weâll reduce the amount of steel during our next rebuild
the anti tip only contact the foam tiles when the robot is going to tip so it doesnât affect regular driving/auton. we have position tracking program but we havenât put tracking wheels on our robot (running out of time). weâll do that shortly though
well⌠Iâm not sure if that will worth it. you can lift a lot of weight with the help of rubber bands, but rubber bands will also bend everything on your robot.
the first one is kind of like a tube (or a claw) intake that I posted at the very beginning of the season. We had a complete cad file for it, but before we finished building everything we decided to switch to a tray lift because rollers are the fastest/easiest way to intake cubes. The other two robots were all tray lift, but very different from the current one
Aside from rubber bands, can you lift 7 cubes through sheer gear ratio?
I wish I could like a whole thread. There is some deep knowledge here.
How wide is your lift? I saw 4700Nâs explanation and they said they had trouble with the lift being too narrow to fit the tray and pivot system comfortably.
you probably can. but that would make your lift slower, while the most important thing is to maximize your botâs efficiency
our lift is 24 grid (12 inches) wide. everything fits in there just fine, but I doubt if I can make the lift narrower
yeah 24 is about the thinnest possible with lift tray.
We have a similar design which is currently max sized (so almost 18) and its giving us trouble so weâre probably going to try to reduce to about 14 in. which we feel should get the job done. We actually decided to go with a single motor DR4B as opposed to a 3 motor drive or a single motor intake, as we made a holonomic drive and also didnât think a single motor intake wouldnât be powerful enough to hold cubes. Thatâs a great robot, though!
Great job!!!
⌠just out of curiosity, how is the three motor drive working out? Are the motors overheating.
