Argh!

[Duke 13370]

This is for those teams that are using the drives and mounts provided by FIRST (using the drills).

Has anyone else tested these, because for us they dont seem to make it over the ramp very well without popping breakers. We have some serious problems now.

ARGH!

[f22flyboy]

We are, using a slightly modified version, and have had no problems.

First check your gearing- you may be geared to high. Also make sure that the drills are in low gear

Also check the alignment of your gears and wheels. Disconnect the drill from your gears and wheels, spin the wheel and see how long it spins. If you have a lot of rolling friction you may need to realign your wheels and grease the bearings and gears. If you are using the helical gears make sure they are well greased.

[Onizuka]

i think the problem that you are having is due to being geared too high. still check out alignments and what speed the drill is in, if its in high then change to low and if its in low check gearing.

[Pierson]

We are using the drill motors on 40 Amp breakers in low gear with cool tracks. We didn't have any breaker popping.

http://www.chiefdelphi.com/forums/sh...threadid=18145

[Duke 13370]

we litterally have the basic drive train, we hooked up to the big 9*2 wheels, which may have somehting to do with it since they are different from your team's, but if first was so concerned with the one hour robot, why did they give us a drive train that can't make it over the hill with an underwieght (80lbs roughly) robot?

lubing it up may be all it needs, but we really can't do that now.

[Onizuka]

could you clarifiy if your using just a direct drive(no gear reduction) or using something to reduce the gear ratio. If your not then the drill motors going to have a hard time with those wheels.

[Adam Y.]

Errr can someone tell me which position is low gear for the drill motors??????

[Eric Reed]

Low position is when the collar on the transmission is pushed forward toward the output shaft.

You shouldn't have a problem getting over the ramp with the one hour transmission set to low. We can do it with our 130 lb bot, even with a small caster on the front (which is very inefficient on the mesh). We are using 9x2 wheels.

Eric.
Team 481
De Anza High School

[Jim]

Be sure the gears are lubricated with a sticky grease.

Turn the drivetrain by hand; sequentially removing items from the system. You may find one think mis-aligned that is causing the lion's share of binding

ALWAYS ALWAYS ALWAYS use a fresh, fully charged battery. V=IR, low volts and these new motors become "amp hounds".

When you hit the pits at your first regional, be prepared with a game plan to quickly and methodically approach this problem.

Good Luck

[Adam Y.]

Low position is when the collar on the transmission is pushed forward toward the output shaft.

Thanks

[Duke 13370]

could you clarifiy if your using just a direct drive(no gear reduction) or using something to reduce the gear ratio. If your not then the drill motors going to have a hard time with those wheels.

We use the helical gearset in the black box first provided

[Onizuka]

In your other thread that you posted in where you said you were capping the max power to the motors at 2/3. try giving full power to the motor and see if that helps.

[Duke 13370]

In your other thread that you posted in where you said you were capping the max power to the motors at 2/3. try giving full power to the motor and see if that helps.

Oh, yeah, that may help. If i remember correctly, though, we finnally set the speed max to the joystick wheel, but it's to late now.

[DougHogg]

Originally posted by Duke 13370
We use the helical gearset in the black box first provided

Are you sure that your transmissions are locked in low gear? As the earlier message said, the white collar should be pushed forward toward the front of the transmission (where the drive shaft comes out).

It might be a good idea to find yourself some smaller wheels, but be sure that you will still have enough clearance on the ramp.

Also what do you have on your other wheels? We were popping breakers in high gear (using the black motors) when we turned and found that we had to reduce side friction on two of the wheels by adding cable ties. (We have 4 wheel drive.) Basically we couldn't turn in place in high gear until we added the cable ties. Even then, we can't just sit there and spin in place for any length of time. The breakers start to pop.

[Duke 13370]

Are you sure that your transmissions are locked in low gear? As the earlier message said, the white collar should be pushed forward toward the front of the transmission (where the drive shaft comes out).

Yeah, we're sure, it may just have been a drained battery or something completly different that caused it, but i know the motors were locked in low. One of the other students (scuba_sm) found out how to lock the drives from the inside so they would never slip into high (or low, depending on how it's done), and it works very well.