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Unread 05-02-2007, 14:37
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Re: BaneBots Gearbox Locking UP

On the transmission I took apart, the black wear plate was well stuck (with grease) to the motor end aluminum block, and it would be very easy to overlook the fact that it's a separate part, and needed with the new block.
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Unread 05-02-2007, 14:55
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Re: BaneBots Gearbox Locking UP

Quote:
Originally Posted by squirrel View Post
On the transmission I took apart, the black wear plate was well stuck (with grease) to the motor end aluminum block, and it would be very easy to overlook the fact that it's a separate part, and needed with the new block.
That was what I was thinking was likely the case, that the grease might cause it to stick to the other plate (that you are removing), thus causing it to get overlooked.

Good thing for all the team using the 2-motor adapter to make sure of, otherwise any tippage of the transmission/motor abbembly OR of the robot (say when you might fall off a ramp???) might then lead to a seized motor
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Unread 09-02-2007, 14:35
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Re: BaneBots 56mm Gearbox - Second Stage Sun Seizing

There have been a few creditable reports of this S4 problem (S4 = Second Stage Sun Seizing).

Here is another one:
http://www.chiefdelphi.com/forums/sh...3&postcount=79

I don't yet know how much of a problem this is going to be but this is what I recommend to teams:

Take apart your Banebot 56mm gearbox and inspect it.
  1. I would look for contaminated grease (shavings, brass powder, whatever). If you find contaminated grease, I would clean out the entire gearbox and carefully re-grease everything with an automotive or lithium grease from your local hardware store (you don't really need any super duper grease for this application). Make SURE you lube the output shaft/second stage sun surface.
  2. I would make sure that the output shaft/second stage sun interface has been greased well -- check both the sun's internal surface and the shaft's external surface.
  3. While I am looking for grease, I would make sure that both surfaces are smooth. Look for pitting, gouging and/or scoring. If I found any thing that bothered me at all, I would used some fine emery cloth to clean the two surfaces up and then I would clean out the entire transmission and re-grease it.
  4. If this S4 failure happened after I knew that the interface was smooth and well greased, I would consider cutting off the output shaft so that the second stage sun just floated in the gearbox. There are many proven transmissions that work this way. I would use it as a last resort, but it is an option to consider.
If any more teams see this S4 failure, please post a note in this thread.

More to come. Stay tuned.

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Last edited by Joe Johnson : 09-02-2007 at 15:00.
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Unread 09-02-2007, 21:30
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Re: BaneBots 56mm Gearbox - Second Stage Sun Seizing

how would we get the siezed sun gear off?
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Unread 10-02-2007, 07:43
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Re: BaneBots 56mm Gearbox - Second Stage Sun Seizing

Quote:
Originally Posted by Adama View Post
how would we get the siezed sun gear off?
On our's, there was about a 1/16" gap between the the sun and the the last stage planet carrier plate. There was not enough room to get any gear puller we had on it, but the one BaneBots sells might have fit. We clamped the output shaft in a vise, put a cressent wrench on the "D" of the sun gear, and worked it back and forth to loosen it a little. Then a second person pried up between the carrier plate and the sun gear with two screw drivers (but not so hard so as to bend the carrier plate) while the first continued to work the sun gear back and forth.
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Unread 10-02-2007, 08:33
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Re: BaneBots 56mm Gearbox - Second Stage Sun Seizing

We had issues with the end of the output shaft grinding. Not thinking, I didnt get any pictures. After we opened it, cleaned the grease and shavings out, put new grease in we checked to make sure that the output shafts were perfectly level. They work fine now. Our guess is that originally we didnt have the output shaft level.
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Unread 10-02-2007, 10:59
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Re: BaneBots 56mm Gearbox - Second Stage Sun Seizing

thanks

my father and i got impatient and within a half an hour of my posting we had a pen torch and a screwdriver. we heated up the gear and pryed with a screwdriver and it came off in about a minutes worth of work. Besides the sun gear being really freaking hot for 10 minutes there was no damage. we then deburred the shaft and inside of the gear and put it back on. the sun spins freely now and after putting everything back together it works fine and in general sounds smoother and less strained.
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Unread 10-02-2007, 12:52
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Re: BaneBots 56mm Gearbox - Second Stage Sun Seizing

We had the same sieving problem with ours. I spoke to Banebots on the phone, and was told to cut the post off the shaft, it really wasn't necessary. We did that, and everything seems fine now. It originally siezed while running it on the bench, no load, after about 10 minutes. We ran it after modification for about 20 minutes without issues.
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