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Unread 21-12-2014, 11:14
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Re: pic: Low Profile Gearbox Front View

Quote:
Originally Posted by JesseK View Post
Under what conditions would one "lose a CIM"? In 10 seasons I have yet to experience a bad CIM or see one in person.
I have, just once. It was a brand new CIM in 2012. We weren't able to climb the bridge straight one match, so right after the match we felt all four CIMs, three were the standard moderately warm to touch, one was cold as if it hadn't been running (which it hadn't, we checked after removal).

While rare, it can happen so it's not a bad idea to design for CIM removal.
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Unread 21-12-2014, 16:44
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Re: pic: Low Profile Gearbox Front View

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Originally Posted by JesseK View Post
Under what conditions would one "lose a CIM"? In 10 seasons I have yet to experience a bad CIM or see one in person.
I have right now no less than four cims sitting my garage. I took them home because they were burning up and were no longer used on the team.
Some grease on the insides brought them back to life, but it is possible if they heat up too much.
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Unread 20-12-2014, 21:09
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Re: pic: Low Profile Gearbox Front View

Quote:
Originally Posted by Andrew Lawrence View Post
How is this mounted to tubing? It looks like it's only using the bearing block bolts to hold the gearbox on.

Also, slight tidbit - the ability to use multiple pinion sizes is a design and feature of WCP gearboxes, not the VEX ones. The DS and SS are made by WCP. VEX and WCP are resellers of each other's products. Just clearing that up so that credit is given where credit is due.
I would assume since this gearbox is modeled like the WCP DS, that the bolts on the bottom part of the GB would go through the tube and bolt to it.
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Unread 21-12-2014, 01:09
JorgeReyes JorgeReyes is offline
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Re: pic: Low Profile Gearbox Front View

Quote:
Originally Posted by Andrew Lawrence View Post
How is this mounted to tubing? It looks like it's only using the bearing block bolts to hold the gearbox on.

Also, slight tidbit - the ability to use multiple pinion sizes is a design and feature of WCP gearboxes, not the VEX ones. The DS and SS are made by WCP. VEX and WCP are resellers of each other's products. Just clearing that up so that credit is given where credit is due.
Apart from the the bearing block, the two bottom bolts through the tube and bolt onto it, just like cash4587 said.

You are correct it is the DS and SS gearboxes that make the adjustable cim mounts but I am so used to using components from both that I tend to get them mixed up a lot.
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Unread 20-12-2014, 21:21
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Re: pic: Low Profile Gearbox Front View

Nice design. I'm a little worried about how the chains or belts will make it out of the gearbox and to other wheels. It looks like they would go right into the lower standoff tubes.
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Unread 21-12-2014, 11:56
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Quote:
Originally Posted by JesseK View Post
Under what conditions would one "lose a CIM"? In 10 seasons I have yet to experience a bad CIM or see one in person.

We managed to damage all 6 CIMs in our drivetrain at Waterloo last year. We were having issues with popping breakers, inconsistent performance and the CIMs getting very hot very quickly. When we removed each CIM from the gearbox we found their no load current was 7-10 amps versus 2-3 amps a stock CIM would have. Replacing all our CIMs fixed our issues.
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