pic: This is our robot as of last night. Alot more should get done this week now that things are in place

[dfukuba]

Originally Posted by foundbobby

Are those the banebot transmissions?

How efficient have you guys determined they are?

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.

[dfukuba]

Originally Posted by mike1062

kool about how much longer do u think it will be tell u get done

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.

[dfukuba]

Originally Posted by Kevin Sevcik

He said 6WD. I'm hoping there's another border piece on the exposed side to support the other side of the tranny shaft. Otherwise.... ick. Seeing a shaft loaded like that seriously distresses me.

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

[Jaine Perotti]

Originally Posted by Hachiban VIII

I'm not sure I understand how that will fit in the 72" limit. If your arm is 50" long and the bot is 38" then you will be 88" in total (of course I'm just guessing).

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.

[dancingfool]

Wow! That looks really good!

Good luck

[jgannon]

Originally Posted by BurningQuestion

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.

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.

[=Martin=Taylor=]

Originally Posted by AdamHeard

It seems like if there was more, the window motor probably can't handle the load very quickly.

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...

[AdamHeard]

Originally Posted by Hachiban VIII

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...

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.

[=Martin=Taylor=]

Originally Posted by AdamHeard

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.

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.

[AustinSchuh]

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.

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.

[AdamHeard]

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....

[dfukuba]

Originally Posted by Hachiban VIII

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...

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

[Lil' Lavery]

Originally Posted by jgannon

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.

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.

[chaoticprout]

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.