Intake Motors...

[charby611]

As of right now, my team is using Andymark PG71 gear motors, mated to the AM-0914. We are running into difficulties with the speed the motors are running on our intake arms. These Andymark Motors are not running at the speed we need to be able to suck in the totes properly. A weight is an issue on our robot, but we need the speed.
I was wondering if anyone had any recommendations on anyway or any other motors with a gear box that will help?

What gear ratio are you running your intake wheels at? 5 to 1, etc......???

Maybe a BAG motor with a gearbox from VEX? I appreciate any ideas and references to a specific set up that will work!

[RoboChair]

A BAG motor with a VersaPlanetary Gearbox with a one of the following ratios 5:1(2800RPM Free), 7:1(2000RPM Free), 9:1(1555RPM Free), 10:1(1400RPM Free)

We are running our 4 7/8 Banebots wheels with a 10:1 BAG on our bot intake.

[GeeTwo]

Originally Posted by charby611

As of right now, my team is using Andymark PG71 gear motors, mated to the AM-0914. We are running into difficulties with the speed the motors are running on our intake arms. These Andymark Motors are not running at the speed we need to be able to suck in the totes properly. A weight is an issue on our robot, but we need the speed.
I was wondering if anyone had any recommendations on anyway or any other motors with a gear box that will help?

The PG27 will run almost three times as fast as the PG71. The gearbox is available separately, and will be a direct replacement, no resizing of other components should be needed.

[Chris is me]

I don't know why you guys are geared so fast. We have a BAG geared 35:1 on 4" wheels and it grabs the totes VERY quickly - less than a second from contact to in place. As in our intake slams the box into our frame before we can react. Plenty fast. If you go with a BAG, you definitely want at least this much reduction. In testing we used 15:1 and the intake was so fast that most of our traction materials couldn't grab the tote without burning out.

Edit: Didn't realize you were using the PG71 - which is already geared down 71:1 as the name would suggest. A PG27 is both faster and lighter, and would make your intake 3x as fast (with 3x less torque).

[silverD]

Originally Posted by charby611

We are running into difficulties with the speed the motors are running on our intake arms. What gear ratio are you running your intake wheels at? 5 to 1, etc......???

Maybe a BAG motor with a gearbox from VEX? I appreciate any ideas and references to a specific set up that will work!

I have seen a wide range of ratios for intake wheels for this year. The amount of compression and wheel diameter will also factor in. From Andymark, have you tried the PG27 (27:1)? If you were to purchase items now, I'd recommend the VersaPlanetary due to it's flexibility in ratios, motors, and mounting. The weight looks to be a wash between the 2 options. We have a mix of ratios on hand for the VersaPlanetary too. I think we have the PG27, but would need to check. Let us know if we can help.
Nate

[Steven Smith]

Also worth noting (edit: Silver did), as I'm personally looking at options to integrate an active intake for swap in at next competition...

Shouldn't the discussion shouldn't be more along the lines of linear speed?
A faster RPM on a smaller BB wheel or a slower RPM on a larger BB wheel would likely have similar results (not accounting for rotating mass and wear effects).

So if a given team is running their intake rollers at X RPM, I think noting the type of wheel and diameter would be pertinent.

[silverD]

Originally Posted by Steven Smith

Shouldn't the discussion shouldn't be more along the lines of linear speed?
A faster RPM on a smaller BB wheel or a slower RPM on a larger BB wheel would likely have similar results (not accounting for rotating mass and wear effects).

So if a given team is running their intake rollers at X RPM, I think noting the type of wheel and diameter would be pertinent.

We prototyped intake wheels and came to the conclusion that the max linear speed we'd need to pull in the tote (assuming no slip) was around 5 ft/s. To achieve this we had selected 2-7/8" banebots wheels paired to VersaPlanetary geared to 30:1 and powered by a bag motor. We would then be able to slow down the intake from there if needed. I want to note that currently our bot doesn't make use of intake wheels so this is where our data ends.

[electroken]

We're using RS-550 motors on Banebots P60 64:1 planetaries. The wheels are home-grown and 4" in diameter. This setup is working well for us.

[Ether]

Originally Posted by electroken

We're using RS-550 motors on Banebots P60 64:1 planetaries. The wheels are home-grown and 4" in diameter. This setup is working well for us.

How do you prevent the motors from stalling as the intake completes?

[ice.berg]

We have window motors geared up through belt and sprocket about 1:2 with bane bots 4 7/8" wheels on the end.
Seems to be working great so far. No issues with stalling or going to fast/slow

[NWChen]

To save some money, we maintained our PG71 setup by replacing the RS775s with 9015 motors (am-0912), providing us with a 71:1 ratio (225RPM Free).

We use 4 7/8" BaneBots wheels too, giving us a decent ~4.75 ft/s tangential speed on the intake. If you choose to pair your existing PG71s with 9015 motors, be sure to order the necessary hardware kit.

[Ryan Dognaux]

We're using 50:1 Versaplentary's with bag motors & 3 7/8" orange banebots wheels. They work pretty well for us, we may try some 4" colsons though as the banebots wheels are getting chewed up quickly.

[SJaladi]

We're using BAG motors with a 100:1 VersaPlanetary gearbox running 4" colsons. While it intakes totes a little slower than some of the other designs out there we found that the higher ratio gives us enough torque to allow for some misalignment on the totes and still reliably intake them.

[electroken]

Originally Posted by Ether

How do you prevent the motors from stalling as the intake completes?

A limit switch on a digital input tells the control system when a tote is within its last inch of travel.

[Ether]

Originally Posted by electroken

A limit switch on a digital input tells the control system when a tote is within its last inch of travel.

Do you have a picture of that you could post? So many rookie teams ask for advice how to mount limit switches. It would make a good reference link. Thx.