VEXpro 2016

[Jared Russell]

Originally Posted by Thad House

Do you guys ever think you would be able to test the old 775, that way teams could easily compare it to the new 775pro?

Look at the page again

http://motors.vex.com/

[nuclearnerd]

One stat I'd like to see on the motor page: how long can each motor run at stall before it burns out.

At 135W, and no mass to sink it, I bet the 775Pro burns in a second. (Unless you could rig a secondary cooling blower. Hmmmm)

[AdamHeard]

Originally Posted by nuclearnerd

One stat I'd like to see on the motor page: how long can each motor run at stall before it burns out.

At 135W, and no mass to sink it, I bet the 775Pro burns in a second. (Unless you could rig a secondary cooling blower. Hmmmm)

The locked rotor stall test conveys this. Looks like it lasts 3.911 seconds.

Battery sag + all the resistance in line changes that some on an FRC robot though. These look like they'll be fairly robust.

[nuclearnerd]

Originally Posted by AdamHeard

The locked rotor stall test conveys this. Looks like it lasts 3.911 seconds.

Battery sag + all the resistance in line changes that some on an FRC robot though. These look like they'll be fairly robust.

Oh thanks. I missed that (didn't realize there was more information when you click on each motor). 4 seconds isn't a lot of time though. Maybe it's time to design a Versaplanetary clutch stage?

[JVN]

Originally Posted by nuclearnerd

Oh thanks. I missed that (didn't realize there was more information when you click on each motor). 4 seconds isn't a lot of time though. Maybe it's time to design a Versaplanetary clutch stage?

If you like stalling motors at 12V for that much time... perhaps I can interest you in one of our sealed-can motors?

[nuclearnerd]

Originally Posted by JVN

If you like stalling motors at 12V for that much time... perhaps I can interest you in one of our sealed-can motors?

Probably a wise suggestion I'm trying to remember how many intake motors my old team went through in 2014. It was nice to have a lightweight powerful motor to rush the ball into the bot, but when the ball came in a little crooked... poof.

[Anupam Goli]

Looking forward to those integrated encoders on the VP. This is a great addition for teams that are looking to do more advanced controls without having to use third party sensors and create custom mounts.

Also obviously excited for the 775pro, can't wait to get our hands on some.

[JesseK]

Is the VersaPlanetary Integrated Encoder Thru Coupling the same material as the typical Versaplanetary gearset? Is there a maximum torque/power for the coupling, or is it more likely that other things will break first? This is a 'best practice' question for something like an arm or something like a 2015 tote elevator winch. Phrased via example, would the encoder be safe enough on the last stage in (e.g.) the faster stackers of 2015 or would we want to consider moving it a stage up to reduce its transmitted torque?

[Aren_Hill]

Originally Posted by JesseK

Is the VersaPlanetary Integrated Encoder Thru Coupling the same material as the typical Versaplanetary gearset? Is there a maximum torque/power for the coupling, or is it more likely that other things will break first? This is a 'best practice' question for something like an arm or something like a 2015 tote elevator winch. Phrased via example, would the encoder be safe enough on the last stage in (e.g.) the faster stackers of 2015 or would we want to consider moving it a stage up to reduce its transmitted torque?

This torque spec will be updated on the product page in the coming weeks.

-Aren

[Anthony Galea]

Does the VersaDrop only work with two 4" wheels? Or can you use a 4" wheel and a 6"?

[nuclearnerd]

Originally Posted by 3175student17

Does the VersaDrop only work with two 4" wheels? Or can you use a 4" wheel and a 6"?

The total drop is only ~0.6" (only 0.2" of which is "below zero"), so I'm guessing not as designed. Instead, I'm trying to find out if the gear ratio between the two wheels can be modified significantly.

[ahartnet]

It's hard to pick a thing to be most excited about.

I'm very thankful for all the effort put into the data gathering on motors. I agree with Richard above that that might be the best gift to FRC in quite some time.

Tied with the 775Pro.

Tied with the the integrated VP encoder that can do both relative and absolute. (EDIT: See note from nuclearnerd ozrien below)

[safiq10]

This so perfect! Thank you to everyone a part of the Vex team, but one question: Will we ever get a #ballshiftsohard hoodie?

[nuclearnerd]

There's a big asterisk on the "absolute encoder" thing. It's still a relative encoder, but it includes it's own counter. It's nice not to have to implement a counter on the rio, but you would still have the problem of the zero changing every time you start up the robot. An actual absolute encoder would give the proper reading no matter how often the sensor had been turned off and moved. (see page 22 of the encoder user guide here: http://content.vexrobotics.com/vexpr...User-Guide.pdf)

I'm wondering - do the rules allow us to power the encoder from a separate 5V battery that we could leave on all the time (even when the main battery is removed)?

[ahartnet]

Originally Posted by nuclearnerd

There's a big asterisk on the "absolute encoder" thing. It's still a relative encoder, but it includes it's own counter. It's nice not to have to implement a counter on the rio, but you would still have the problem of the zero changing every time you start up the robot.

Thanks for the catch. Definitely a big asterisk that I'm glad you pointed out. Got wrapped up in too much excitement!