Prototype Small Wheeled Shooter
 

We just posted a blog entry about our current prototype shooter. It uses much smaller diameter wheels than many teams that we have seen post of CD. We're hoping this idea might inspire some teams that are struggling to package their large shooters.

Blog Entry with full specs on the shooter configuration.

Youtube Video

Re: Prototype Small Wheeled Shooter
 

Good shooter!! what motors do you have?

Re: Prototype Small Wheeled Shooter
 

The blog entry has the full specs for the prototype. The two motors are a BB550 and a BAG motor.

Re: Prototype Small Wheeled Shooter
 

Well...this is kinda awesome.

Re: Prototype Small Wheeled Shooter
 

You sir, have just lightened up alot of robots.

Re: Prototype Small Wheeled Shooter
 

Try slowing that second motor down (the BAG motor) . Try running it at ~10 volts.

See what happens. Easy enough to do.

Re: Prototype Small Wheeled Shooter
 

So you're actually spinning the 2nd wheel slower than the 1st. What made you decide to do that? Seems everyone is making the 2nd wheel spin faster than the 1st.

Re: Prototype Small Wheeled Shooter
 

Read the blog again. He is spinning the 2nd wheel FASTER than the 1st.

1st wheel 550 geared 10:1 = 1,930 free rpm

2nd wheel BAG geared 1:1 = 14,000 free rpm

Re: Prototype Small Wheeled Shooter
 

You are correct, I read the 14000 on the chart provided by FIRST as 1400.

I withdraw my question.

Re: Prototype Small Wheeled Shooter
 

Allen,

This is great work! I admire your lack of hesitation to give away this information. Shows you and your team's true colors.

Thanks and good luck at making it even better!

-Parker

P.S. - Have you tried shooting from the floor? What kind of angle do you expect to have to pitch the shooter to for the 3pter?

Re: Prototype Small Wheeled Shooter
 

Just wondering how you set the one gearbox to be a 1:1 ratio?

Also, anyone have any ideas as to how you mount the banebots wheels directly to a CIM?

Thanks

Re: Prototype Small Wheeled Shooter
 

On their blog they explained that they used a Versaplanetary box with all of the gears within removed. The output shaft of the VP boxes are the same hex as the banebots wheels.

Re: Prototype Small Wheeled Shooter
 

Thanks, didn't see that there.

Also we were wondering how you direct drive the banebots wheels with a CIM.

Re: Prototype Small Wheeled Shooter
 

The reason they are using the versa may be because the output shaft on a versa is actually a .5 hex, which is an ID that banebots sells their wheels with.

Locking a stage in a planetary gear is fairly simple - look up how people did it with globe motors. It involves glueing the sun gear and planetaries together with something, then dremeling off the teeth of the planetaries so they don't touch the ring gear.

FYI, you can't really be guaranteed that you can direct drive a banebots with a cim without installing an insert and broaching it with a keyway. The unfinished bores on the banebots wheels are not actually a measured diameter: it varies. They ream it to .375, but in most cases it comes bigger than the 8mm shaft of a cim from their manufacturer, and hence will not work directly on a cim.

Re: Prototype Small Wheeled Shooter