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Unread 21-02-2016, 14:09
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AndyMark 8 Inch pneumatic hub fail

All,

We took apart our drivetrain to give it some TLC today and discovered all of our 8 inch pneumatic hubs are failing. Very similar to the rhino tread pulleys.

If you are using them, I suggest you take a close look are your hubs.

I just sent pictures to AndyMark and we awaiting for a reply.

Locktite was just applied, it was not there before about an hour ago.

http://imgur.com/a/DX4OH

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Unread 21-02-2016, 14:13
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Re: AndyMark 8 Inch pneumatic hub fail

Is that loctite on the nuts? Loctite will destroy the polycarbonate hubs.
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Unread 21-02-2016, 14:14
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Re: AndyMark 8 Inch pneumatic hub fail

What's the blue stuff all over? Is that loctite? If so, that explains it. Loctite eats polycarbonate, chemically, causing it to become brittle and crack.
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Unread 21-02-2016, 14:15
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Re: AndyMark 8 Inch pneumatic hub fail

They're failing because you put loctite on your screws.

You shouldn't have done that for 2 reasons, the first being that loctite will melt the plastic, the second being that it's pointless because you're using nylock nuts.
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Unread 21-02-2016, 14:27
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Re: AndyMark 8 Inch pneumatic hub fail

Even have been using these hubs successfully without using any loctite.

It seems like this isn't Andymark's fault.
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Unread 21-02-2016, 14:38
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Re: AndyMark 8 Inch pneumatic hub fail

The locktight was just applied to get through the next couple of days!

The damage goes all the way through the hubs.

I highly suggest everyone using these take to a look at your hubs.
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Unread 21-02-2016, 14:50
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Re: AndyMark 8 Inch pneumatic hub fail

You don't need loctight when you use nylock nuts...
Looking at how much excess loctite is on the hub, that damage could have easily been done by a combination of chemical breakdown and stress on the plastic.
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Unread 21-02-2016, 14:52
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Re: AndyMark 8 Inch pneumatic hub fail

Quote:
Originally Posted by Fusion_Clint View Post
The locktight was just applied to get through the next couple of days!

The damage goes all the way through the hubs.

I highly suggest everyone using these take to a look at your hubs.
Again, it looks like the failure was caused by the loctite and not the hubs. It causes the polycarbonate to get brittle and crack so I'm not surprised the damage goes through the hub.
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Unread 21-02-2016, 14:53
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Re: AndyMark 8 Inch pneumatic hub fail

Locktite was just applied, it was not there before about an hour ago. After the damage was found a student put the locktite on in an act of desperation.
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Unread 21-02-2016, 15:00
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Re: AndyMark 8 Inch pneumatic hub fail

Quote:
Originally Posted by Fusion_Clint View Post
Locktite was just applied, it was not there before about an hour ago. After the damage was found a student put the locktite on in an act of desperation.
What did you anticipate loctite helping with that the lock nuts weren't already doing for you?
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Unread 21-02-2016, 15:27
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Re: AndyMark 8 Inch pneumatic hub fail

Everyone, please read the thread BEFORE responding.
The Locktite was added AFTER the failure. It is NOT the cause of the failure.

I believe the nylock nuts may have actually contributed to the failures.
Some nylock nuts have larger outside dimentions than the comparable regular nuts.
Forcing the larger nut into the hex opening, and over tightening them may crack the polycarbonate.
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Unread 21-02-2016, 17:00
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Re: AndyMark 8 Inch pneumatic hub fail

Quote:
Originally Posted by Fusion_Clint View Post
The locktight was just applied to get through the next couple of days!

The damage goes all the way through the hubs.

I highly suggest everyone using these take to a look at your hubs.
What screws/nuts are you using?

I've got 3 robots I'm working with that are using those hubs and none show anything like that kind of wear.
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Unread 21-02-2016, 17:02
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Re: AndyMark 8 Inch pneumatic hub fail

Quote:
Originally Posted by billbo911 View Post
Everyone, please read the thread BEFORE responding.
The Locktite was added AFTER the failure. It is NOT the cause of the failure.

I believe the nylock nuts may have actually contributed to the failures.
Some nylock nuts have larger outside dimentions than the comparable regular nuts.
Forcing the larger nut into the hex opening, and over tightening them may crack the polycarbonate.
We did read the thread. He edited his original post to say that it was applied after the damage appeared.

[edit] On closer inspection there are some cracks around the nut cavities that look like they might be consistent with slightly too large of a nut.
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Unread 21-02-2016, 17:08
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Re: AndyMark 8 Inch pneumatic hub fail

Look, I'm not trying to get anything other than the word out to check your hubs.

The locktite was applied after the fact.

We are fixing our issue, just make sure you don't have the same one.
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Unread 21-02-2016, 17:14
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Re: AndyMark 8 Inch pneumatic hub fail

Quote:
Originally Posted by Cory View Post
We did read the thread. He edited his original post to say that it was applied after the damage appeared.

I'm not saying OP is a liar, but that damage looks a lot like the damage loctite would create when applied to plastic. See this picture
No argument. Locktite WILL cause this type of failure!

Forcing in nuts that are too large for the opening can crack the polycarbonate too. Just my $.02.
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