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Unread 25-01-2017, 11:12
GDG 2337 GDG 2337 is offline
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pic: Toughbox Mini Bound Up On AM14U3 KoP Chassis

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Unread 25-01-2017, 11:15
Andrew Schreiber Andrew Schreiber is offline
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Re: pic: Toughbox Mini Bound Up On AM14U3 KoP Chassis

George, thanks for documenting this. We ran into similar binding issues Monday night, students reported it was a similar issue but I, frankly, just assumed it was they'd forgotten to lubricate something.

Now that you're seeing similar issues I'm concerned that others are too. Which is a shame, otherwise the AM14U3 has seemed pretty solid.
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Unread 25-01-2017, 12:58
M.O'Reilly M.O'Reilly is offline
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Re: pic: Toughbox Mini Bound Up On AM14U3 KoP Chassis

Our team also experienced binding in one of our transmissions. We disassembled, re-assmbled, and wheels spun without much resistance. Have not driven on them yet though, so can't be sure this problem has been totally resolved (since we didn't really do anything except re-seat bearings and gears )

Thanks for bringing your investigation to our attention.
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Unread 25-01-2017, 14:22
GDG 2337 GDG 2337 is offline
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Re: pic: Toughbox Mini Bound Up On AM14U3 KoP Chassis

In this case the Tough box Mini housing would not set flush to the rail, so when the housing was tightened, the gear box bound up. The bearing was bottoming out in the bore with the hex bearing and output shaft gear correctly installed.
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Unread 25-01-2017, 16:37
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Re: pic: Toughbox Mini Bound Up On AM14U3 KoP Chassis

Thanks for the heads up!

We had a TB-mini bind up near the end of build yesterday. We checked the obvious stuff like gears installed backwards (bosses together instead of at bearings), but not this. We just replaced the gearbox with one we had build for the second robot and moved on, and we'll look at the binding gearbox tomorrow. (no build today.) I'll be sure we check for this early in the process.
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Unread 26-01-2017, 13:26
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Re: pic: Toughbox Mini Bound Up On AM14U3 KoP Chassis

We had a similar problem on a practice base that was constructed for our programming team during our training season. We never looked much into this, its good to know of this issue. Will look into it once the season is over!
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Unread 26-01-2017, 14:29
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Re: pic: Toughbox Mini Bound Up On AM14U3 KoP Chassis

Thank you for the heads up. This is great to know as we begin to test our drive base. Would you be willing to link to where we could purchased the thinner bearing?
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Unread 26-01-2017, 14:45
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Re: pic: Toughbox Mini Bound Up On AM14U3 KoP Chassis

Quote:
Originally Posted by Starke View Post
Thank you for the heads up. This is great to know as we begin to test our drive base. Would you be willing to link to where we could purchased the thinner bearing?
This should be one source: https://www.bocabearings.com/product...z-w-2188c-1901

Hope this helps,
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Unread 26-01-2017, 14:55
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Re: pic: Toughbox Mini Bound Up On AM14U3 KoP Chassis

Quote:
Originally Posted by Starke View Post
Thank you for the heads up. This is great to know as we begin to test our drive base. Would you be willing to link to where we could purchased the thinner bearing?
http://www.andymark.com/product-p/am-0936.htm

This bearing is not shielded, but it has the right dimensions. I can't remember for sure, but I think this bearing is pretty well protected in the gear housing, so I don't think the shielding should be much of an issue. I'm sure someone will correct me if I'm wrong about that.
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Unread 26-01-2017, 15:23
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Re: pic: Toughbox Mini Bound Up On AM14U3 KoP Chassis

Quote:
Originally Posted by mastachyra View Post
http://www.andymark.com/product-p/am-0936.htm

This bearing is not shielded, but it has the right dimensions. I can't remember for sure, but I think this bearing is pretty well protected in the gear housing, so I don't think the shielding should be much of an issue. I'm sure someone will correct me if I'm wrong about that.
I would not risk using an unshielded bearing. If this game is even half as bad as 2014 your steel gears will have a ton of wear by the end of the season, that leads to steel powder in the gearbox, i have no idea what the poweder would due to an open bearing but i would suggest we not find oit. I know that vex has bearings with a 3/8 ID that are shielded that I believe would fit.
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Unread 27-01-2017, 12:19
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Re: pic: Toughbox Mini Bound Up On AM14U3 KoP Chassis

Quote:
Originally Posted by Munchskull View Post
I would not risk using an unshielded bearing. If this game is even half as bad as 2014 your steel gears will have a ton of wear by the end of the season, that leads to steel powder in the gearbox, i have no idea what the poweder would due to an open bearing but i would suggest we not find oit. I know that vex has bearings with a 3/8 ID that are shielded that I believe would fit.
I think the Vex bearings that would "fit" are the same thickness as the ones GDG 2337 pointed out above as too thick. You'll need to find the 0.218" thickness. McMaster-Carr does not have this bearing in shielded form either.
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Unread 27-01-2017, 12:40
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Re: pic: Toughbox Mini Bound Up On AM14U3 KoP Chassis

I'm confused....we had several of our new students assemble our kit chassis this week, and I was watching over them quite a bit. I did notice that the bearings are thicker than the machined portion of the hex shaft, as shown in your photo. But we were very careful to assemble the transmissions as the instructions say, and they worked fine, no binding.

I know in the past we've had trouble with the gearboxes, when I was not so involved with the assembly (but did help with the diagnosis and reassembly), and we've had problems with gears installed backwards causing binding.

I really don't think that a thinner bearing is needed. But I also did not measure the shaft. Have you compared the dimensions of the questionable shaft, with those on the AM drawing?

http://files.andymark.com/AM-2566%20...haft%20Hex.PDF
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Unread 26-01-2017, 14:49
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Re: pic: Toughbox Mini Bound Up On AM14U3 KoP Chassis

Thanks for posting this! Our robot was jerking to the right last night and I was going to begin the investigation today. This is the first place I'll look.
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