RC-Monster Forums - Possible MMM design flaw?

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- - Possible MMM design flaw? (https://www.rc-monster.com/forum/showthread.php?t=23429)

Quote:

Originally Posted by pdcsq (Post 319492)

If your ESC is flying, you break the on/off switch wire because you have this stupid wire coming of the front of the ESC, going under the mounting plate to reach the switch with almost no give. That's what happened to me.

The way the fan wire is routed inside the box is stupid. That is poor design on CC's side.
Then having the Rx and switch wire soldered directly on the PCB and coming out of the box with no strain relief device whatsoever is also very poor design.
If I did that for my customers, I would already be looking for another job!

My suggestion to you then is to design your own perfect ESC and sell to the masses. :yipi:

Or you could contact Patrick and apply for a job at CC to fix all their problems. He is quite accessible.

Of course your real issue could be the tact at which you approached the situation in general. :whistle:

In reality though, had you contacted CC initialy about your problem, they probably would have helped you. :yes:

But how exactly?...

I use the Erevo esc mount on my gmaxx, and the esc doesnt move a millimeter- a foam pad underneath adds some cushioning, whilst the rock solid mount prevents the wires from gettgin yanked or tugged at.

What you can do is add a little clearance to the esc case where the rx and switch wires exit, that should releave the pinching issue; adding thicker wires will only make it visably worse (tight spot to start with afterall).

I will agree that there have been plenty of people with worn through insulation in the past, and it is caused by the poor wire routing and sharp edges of the pcb; I just think that there arent too many other ways to route the wire inside the cramped case, but as Linc pointed out, you can make a few tweaks to alleviate the problem. I myself just enlarged the opening for the wires to exit the MMM, and they've been fine for 2 years or so (MMM v1).

Quote:

Originally Posted by eovnu87435ds (Post 319495)

then again, with detachable wires, you open up a whole new set of issues. they wont be secured to the speed controller, meaning that bumps and such can knock them out. that would also mean that they would have to start to manufacture and sell replacement switches and RX leads for the ones that fly out of the car into space, never to be seen again. that would definitely suck on a race day. there are always pros and cons to every design, and I'm sure it was looked at before put into production.

I'm not a racer, I'm a basher, which is why it's a good solution for me. If the connector is knocked out, the truck stops, I just have to put it back in and ready to go again.
With the damage I suffered, the bashing session was ended and it took me over an hour to go things back into working conditions.

To each his own optimal solution I believe.