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Removing Bosch Drill Pins - Cause of Failure?
Okay,
Last year we did not modify our bosch trannies from the way we received them. We used them in a four motor drive and never once did they fail. However, they would make aweful crunching noises every now and then, that I assume is the pins. To make for a smoother driving experience (like running on only Chips), I was thinking we would remove the pins this year. I read all the other posts and threads on this topic and have not found my exact question asked or answered before. Is there a direct correlation between removing the pins and drill tranny failure? I don't think removing the pins would be the source of the transmission problems but perhaps taking the gearbox apart would cause it to go back together differently or looser. Is this true? I want those pins gone but I never want to have to open or replace the transmission after that. |
Re: Removing Bosch Drill Pins - Cause of Failure?
we removed the pins from our trannsmissions without ever experiencing a single problem after a regional, nats, and 3 off-season comps. I don't know exactly how it was done, but that's because we made sure that the guy who did it knew a lot more about subtly tweaking transmisions than the rest of us did.
in short, do it, it won't hurt you as long as you make sure that you do it right and don't damage other parts of the motor/transmision in the process. |
Re: Removing Bosch Drill Pins - Cause of Failure?
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Does this help??? |
Re: Removing Bosch Drill Pins - Cause of Failure?
If you apply enough force, you can cause those pins to fragment. When they do, you destroy the transmission. We have always removed them.
Cory |
Re: Removing Bosch Drill Pins - Cause of Failure?
My team removed the drill pins last year, but an important thing to remember is to know how the drill motors go back together. We had some motor problems because of not putting it back together exactly as it was before. Just pay attention as you are taking it apart, and it will cause no problems.
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Re: Removing Bosch Drill Pins - Cause of Failure?
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-Rc |
Re: Removing Bosch Drill Pins - Cause of Failure?
If you need to put something back together exactly as it came apart, take digital pictures, ALOT of digital pictures.
Also, the drill motors are not that hard to put back together...just set aside about 30 mins per motor and take your time. I had no trouble putting one back together after it rolled off the table once we took it out of our kit. Spur gears were everywhere! Just remember to take you time putting it back together, and test it OFF the robot! Try to backdrive the gearbox, on or off the motor, with the pins removed you should be able to backdrive the gearbox. Be careful the first time you test with power apply power gently. When you test, you wan to have it running at free load. Good luck, if you're in the same neighborhood and need some help look us up, we would be happy to remove the pins and put it back together again. Good luck -Andy |
Re: Removing Bosch Drill Pins - Cause of Failure?
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The locking pins are very obvious, they are about 3/16" in diameter and about 1/4" long and fit at the end of the "dog bone" in the assembly close to the output shaft. When you reassemble the transmission you need to rotate the output shaft a little to get all the parts to mesh. The case only goes back together one way so you may want to mark it before you disassemble. This is a very simple mod and can be performed in a very few minutes. |
Re: Removing Bosch Drill Pins - Cause of Failure?
I have to add - GUARD your drill motor gear boxes from the general student population on your team
Several times I have watched a student pick one up, say "hey whats this thing?" handle it like any person would lookin at something new and strange and within seconds, the transmission is open and the gears are all over the: A. table B. floor C. student D. all of the above and they only go back together one way (not obvious) denfinately let students look at them if they want to - but first make sure you know how to put one back together -second issue the warning "be carefull - it comes apart really easily!" |
Re: Removing Bosch Drill Pins - Cause of Failure?
with our experience last year, after we took out the pins, our clutch started slipping and wouldnt stop. We tried changing the clutch setting but that wasn't the problem. So we actually had to weld the clutch together to stop the slipping. The drill transmission kept falling apart after every match and we kept putting it back together. But after a while parts wore out on it and it just wouldn't work. So we got two new drill transmissions and left them alone. We never had any problems after that.
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Re: Removing Bosch Drill Pins - Cause of Failure?
if you need step by step directions i'll ask my friend to see if he can post them
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Re: Removing Bosch Drill Pins - Cause of Failure?
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And wear a shirt that you don't mind if it becomes permanatly grease stained. Wetzel |
Re: Removing Bosch Drill Pins - Cause of Failure?
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the clutch plate is in a completely different location from the pins (you don't need to go to that bottom layer of planets where the cluch is so i can't see any reason that THIS would have caused the problem. although it is possible that incorrect reassembling could have lead to the problem...for this reason i also recomend taking the gear boxes apart slowly and over a white piece of paper. |
Re: Removing Bosch Drill Pins - Cause of Failure?
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If you dissassembled the trans to take the pins out and the clutch wouldn't lock, you had reinserted the clutch plate upside down when you put the trans back together. This is a common mistake. |
Re: Removing Bosch Drill Pins - Cause of Failure?
Does anyone know where we can get some drawings for the output shaft and the other parts you have to make when you get rid of the the back drive pins???? Please share if you can.....
We have some people to help the students machine these but maybe not design them. Can you buy them??? Please help.... :confused: |
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