Intake RPM

[AustinSchuh]

Originally Posted by RoboChair

775 pro all the things

front intake was 1800 rpm about 11 FPS surface speed

Bah, that's slow. We ran closer to 25 FPS, and that was the right answer this year. I've been going for 1.5x-2x the robot speed. (I don't keep track of RPM since it doesn't matter). We actually started running 775 Pro's this year over-geared, and then just running them at 70% PWM to reduce the power draw.

It is always a balance between sinking a bunch of power into the roller on stall or normal operation, and waiting on the intake. You don't want your intake to starve the rest of your robot of power.

[IKE]

Has anyone tried doing smooth belt drive like a Vacuum cleaner beater bar?

[AdamHeard]

Originally Posted by AustinSchuh

Bah, that's slow. We ran closer to 25 FPS, and that was the right answer this year. I've been going for 1.5x-2x the robot speed. (I don't keep track of RPM since it doesn't matter). We actually started running 775 Pro's this year over-geared, and then just running them at 70% PWM to reduce the power draw.

It is always a balance between sinking a bunch of power into the roller on stall or normal operation, and waiting on the intake. You don't want your intake to starve the rest of your robot of power.

This guy knows intakes.

Listen.

[JesseK]

We did a BAG motor through a VP 7:1 then to 4" wheels. The gearbox setup was a lot like 1678's 2014 bot - chain-in-tube, and very easy to swap gearing around since the VP gearbox was so exposed. It also allowed us to completely change the intake geometry without worrying about what gearbox to use.

It was pretty speedy (red robot on the bottom at the start of the match). Never stalled the intake or threw the chain. Used 4 Mecanum wheels on the intake axle closest to the bumpers.

[Tom Bottiglieri]

Originally Posted by AustinSchuh

Bah, that's slow. We ran closer to 25 FPS, and that was the right answer this year. I've been going for 1.5x-2x the robot speed. (I don't keep track of RPM since it doesn't matter). We actually started running 775 Pro's this year over-geared, and then just running them at 70% PWM to reduce the power draw.

It is always a balance between sinking a bunch of power into the roller on stall or normal operation, and waiting on the intake. You don't want your intake to starve the rest of your robot of power.

Our intake had an over-geared 775 Pro as well, and we found any stall condition would pop breakers really fast (compared to older motors). We ended up running our intake under current control mode on the Talon SRX to artificially cap the current draw. This caused the roller to run at 100% voltage/speed while unloaded, which was fine for our application. This also had the nice property of working like a software clutch.

It would be cool if the Talon had a current cap mode that still allowed variable voltage control.

[IKE]

Originally Posted by Tom Bottiglieri

Our intake had an over-geared 775 Pro as well, and we found any stall condition would pop breakers really fast (compared to older motors). We ended up running our intake under current control mode on the Talon SRX to artificially cap the current draw. This caused the roller to run at 100% voltage/speed while unloaded, which was fine for our application. This also had the nice property of working like a software clutch.

It would be cool if the Talon had a current cap mode that still allowed variable voltage control.

I was curious how the folks running superfast intakes and 6 cim drives were keeping their main breakers intact. IE, stalling an intake often can occur around the same time as stalling drives when trying to "dig a ball out of the corner".

[Gogoyogert]

We used a mini-CIM with a 4:1 Versa Planetary on it. A mini-CIM is 6200 RPM, so our intake is at 1550 RPM. We didn't try anything else but our intake seems to work very well.