Bag Motor Tips

[craigboez]

Hello all

Because the Bag Motors had issues last year we steered clear of them and used 775s instead. It sounds like the Bag Motor issues have been sorted out, so I'm interested in using them for 2014. We haven't used a VersaPlanetary either, which appear to be the only real easy way to use the Bag motor. I'm interested in hearing tips, tricks, and other feedback from teams who have paired these two items up and used them.

[AdamHeard]

Originally Posted by craigboez

Hello all

Because the Bag Motors had issues last year we steered clear of them and used 775s instead. It sounds like the Bag Motor issues have been sorted out, so I'm interested in using them for 2014. We haven't used a VersaPlanetary either, which appear to be the only real easy way to use the Bag motor. I'm interested in hearing tips, tricks, and other feedback from teams who have paired these two items up and used them.

Especially with their new motor mounting plate, using a BAG motor with a versaplanetery is pretty darn easy.

Vex has multiple pdf's on their site about the vesaplanetary, and that's all the information you really need.

[DampRobot]

Originally Posted by craigboez

Hello all

Because the Bag Motors had issues last year we steered clear of them and used 775s instead. It sounds like the Bag Motor issues have been sorted out, so I'm interested in using them for 2014. We haven't used a VersaPlanetary either, which appear to be the only real easy way to use the Bag motor. I'm interested in hearing tips, tricks, and other feedback from teams who have paired these two items up and used them.

We've found that BAG motors really don't like being stalled. If you stall them, they will smoke. I believe 1678 has had similar experiences too.

Personally, if the difference in mass or size isn't absolutely critical, I'd use a MiniCIM instead. Unless the rules change next year (and I certainly hope they won't) you're better off using the extra power and robustness of a MiniCIM.

[AdamHeard]

Originally Posted by DampRobot

We've found that BAG motors really don't like being stalled. If you stall them, they will smoke. I believe 1678 has had similar experiences too.

Personally, if the difference in mass or size isn't absolutely critical, I'd use a MiniCIM instead. Unless the rules change next year (and I certainly hope they won't) you're better off using the extra power and robustness of a MiniCIM.

Are you saying they "don't like being stalled" compared to a miniCIM/CIM, or compared to a 550 type motor?

[T^2]

Originally Posted by DampRobot

We've found that BAG motors really don't like being stalled. If you stall them, they will smoke. I believe 1678 has had similar experiences too.

Personally, if the difference in mass or size isn't absolutely critical, I'd use a MiniCIM instead. Unless the rules change next year (and I certainly hope they won't) you're better off using the extra power and robustness of a MiniCIM.

They're okay with stalling for a few seconds at a time. The first time we used one in competition, we put way more stress on it than we should have, for around half a minute. This led to the worst smell you'll ever experience in your life.

[DampRobot]

Originally Posted by AdamHeard

Are you saying they "don't like being stalled" compared to a miniCIM/CIM, or compared to a 550 type motor?

Compared to a CIM. Which they can be exchanged for, according to the rules. I'm sure that the BAG is better than a 550 when stalled, although I'm not sure about a 775.

[magnets]

The biggest advantage of the bag motor and versaplTe art , IMO, is that you don't have to wait for the stupid p60 gearboxes to ship. If your team has experience with 775s then just use those. They're a great motor, especially if you don't use the p60 gearbox.

775s are super durable. They've been around forever too.

[craigboez]

We've had good luck with Banebots recently. Shipping times have been good and the P60s have done their job.

[AlexH]

treat the bag motor like a 550.

versaboxen are probably my favorite smaller gearbox out there.

[roystur44]

Anybody have any BAG motor specs

At a comfortable output speed we are looking for the desired gear ratio for the VersaPlanetary to drive a 4-5 inch wheel on a shaft at 20' per sec.

Can somebody make a spreadsheet?

[AdamHeard]

Originally Posted by roystur44

Anybody have any BAG motor specs

At a comfortable output speed we are looking for the desired gear ratio for the VersaPlanetary to drive a 4-5 inch wheel on a shaft at 20' per sec.

Can somebody make a spreadsheet?

The circumference of a wheel is pi*Diameter. Rotations per minute can be converted to rotations per second by dividing by 60. Gear reduction divides RPm by the gear ratio.

Give it a shot.

[Cal578]

Originally Posted by roystur44

Anybody have any BAG motor specs
...

FIRST posted this on their website:
2014_Motor_Information.pdf

And this is on Vex's website:
217-3351

[roystur44]

Adam

Look right?

[craigboez]

Are you sure about that 20 ft/sec number? Seems pretty fast, though I don't know what you're attempting to do with it.

[Short Stuff]

Originally Posted by craigboez

Are you sure about that 20 ft/sec number? Seems pretty fast, though I don't know what you're attempting to do with it.

That does seem a little bit extreme unless you are attempting to throw the ball across most of the field. For our robot last year, we used bainbot motors to shoot the frisbees and they worked really well.