Re: pic: This is our robot as of last night. Alot more should get done this week now
 

Yes these are banebot transmissions. I did not run the robot yet, but i am confident that they will run just well. I will let you know how well they work as soon as i get parts to finish the robot.

Re: pic: This is our robot as of last night. Alot more should get done this week now
 

We had planned to get the entire drivetrain done after the second week of build, but because of a mix up when order parts from mcmaster, we much make another order and wait until they come in. I will post pics when we get this done.

Re: pic: This is our robot as of last night. Alot more should get done this week now
 

I plan to have a plate on the end, but did not plan to support the ends of the shafts. This was something that had also been bugging me for a while. I am thinking about making some kind of pillow block which will mount on to the side plate.

My original idea was to put the wheels as close to the gearboxes as i could so that most of the load would be on the bearings and not the shaft. Because i had never tried this before i was unsure how it would turn out.

--Daniel

Re: pic: This is our robot as of last night. Alot more should get done this week now
 

That would only be if the arm were sticking straight up in the air. Most likely, the arm will be at an angle when deployed, reducing its height off the ground.

For example, at a 30 degree angle, the arm would only add 25" to the 38" height you mentioned. This team is probably within the rules.

Re: pic: This is our robot as of last night. Alot more should get done this week now
 

Wow!:) That looks really good!

Good luck

Re: pic: This is our robot as of last night. Alot more should get done this week now
 

Remember, the 72" limit is within the plane parallel to the floor, not the height. In any case, you're right that it's only a problem if your arm is straight out. I did some trig here that indicates that a widthless arm would be allowed to protrude up to 49.8 inches, minus rear bumpers, from the front of your robot. (Though that thread was speculative, my interpretation was upheld by the Q&A.) So, as long as they don't have their arm straight out while fully extended, they should be perfect.

Re: pic: This is our robot as of last night. Alot more should get done this week now
 

We did some tests with our 5lb. grabber on the end of an arm aprox. the same length as this.

One keyang motor was not able to lift it. After adding a spring, which took virtually all the load off the motor, the keyang could lift it with ease.

However, even without a load on the motor, a light tap on the end of the arm was capable of stripping the gear inside the keyang. Further investigation found that the plastic gears inside these motors have very small teeth and are easily damaged.

Just a warning...

Re: pic: This is our robot as of last night. Alot more should get done this week now
 

The keyang motors aren't that powerful when compared to the others in the kit.

A FP motor (or the BB RS540, which has less power) into the 256:1 42mm gearboxes from Banebots make an easy to integrate motor with lots of torque.

Or take a hint from 968/254 (60 too maybe?) and swap you FPs into the drive to free up two small CIMs to use on the arm.

Re: pic: This is our robot as of last night. Alot more should get done this week now
 

Yeah I forgot to metion that we had a reduction off the keyang...

Unless you can make a worm gearbox FPs and CIMs are backdrivable.

Re: pic: This is our robot as of last night. Alot more should get done this week now
 

I specifically remember 254's driver telling me after last year that they were NEVER going to use the FPs in the drive train again. The FPs caused them too much trouble.

Re: pic: This is our robot as of last night. Alot more should get done this week now
 

You're completely right. I remember 968 telling me the same thing...

Too many hours of robotics and too little sleep causes me to forget things....

Re: pic: This is our robot as of last night. Alot more should get done this week now
 

I did not know that the gears were plastic. We will be using two of these on each side, with about a 1.75:1 reduction. I am hoping that this will be enough, in initial testing it seemed like it would work. But if we run into any big problems i may try to figure out a way to use the big Cim motors. Or get a gearbox for the FP motors. because it seems like we are so far ahead then we have been before, we will see if we can rebuild the whole superstructure after some real life testing.

Thank you for the heads up
--Dan

Re: pic: This is our robot as of last night. Alot more should get done this week now
 

The 49.8 inches is assuming that your arm has no width to it. The wider your arm is, the shorter it can extend without breaking the 72" x 72" box.

Re: pic: This is our robot as of last night. Alot more should get done this week now
 

Well, firstly' the 49" is NOT taking bumpers in to account, and as lil lavery said, you have to take the width of the end of the arm into account.