Buggy BAG Motors

[Mark McLeod]

If you wouldn't mind talking to our guy who's applying the fix I would greatly appreciate it.
I've been on the road for events the past 7 weeks.

I'll PM his contact info.

P.S.
Is it possible that the fix has already been applied to some of the BAG motors shipped?
That would explain why the spring ended up too short (double application).

[wilsonmw04]

Originally Posted by Mark McLeod

If you wouldn't mind talking to our guy who's applying the fix I would greatly appreciate it.
I've been on the road for events the past 7 weeks.

I'll PM his contact info.

P.S.
Is it possible that the fix has already been applied to some of the BAG motors shipped?
That would explain why the spring ended up too short (double application).

wouldn't that imply that this was a known issue?

[JVN]

Originally Posted by Mark McLeod

Beware that Vex posted a BAG "fix" that doesn't appear to be correct.
When the fix is applied the springs on ours become too short to work.
Vex tech support told us the fix is not official and shouldn't have been posted.

So just a warning that this probably shouldn't be attempted.
What worries me most is that the "fix" says it:


The "fix" pdf is posted on the Vex website BAG motor page:
http://www.vexrobotics.com/vexpro/motor-controllers/217-3351.html
Under
Technical Specifications
Downloads & Docs BAG Motor Spring Modification Instructions

http://content.vexrobotics.com/vexpro/pdf/217-3351-BAG_MotorSpringModInstructions_20130411.pdf

Hi Mark,
Yes, this fix is official. We have applied this to many motors in the office. Paul personally supervised the modification of several at Michigan State Championship. If your springs do not look like the ones in the guide, they have not been modified.

Can you help us understand what is wrong?

Also, who did you speak to at VEX? I apologize for this miscommunication. It is possible that news of this fix did not reach all our support personnel. I will personally fix this oversight.

-John

[JB987]

So...to be clear, if we have any BAGS that are of lots other that the 3 identified, are their springs already properly modified?

[JVN]

Originally Posted by JB987

So...to be clear, if we have any BAGS that are of lots other that the 3 identified, are their springs already properly modified?

Yes, these are the only batches we've identified issues with -- if you have problems with a motor from a lot not previously mentioned, please get in touch with us, ASAP.

You can email me directly jvn@vexrobotics.com.

-John

[marccenter]

John,
Thanks for posting the repair instructions.

1) I took apart my bag motor (unused), 2462BL, one of the units identified as having issues, and found a couple of issues. I'm writing here to potentially help others.

2) I did not find the two white spacers on the one side (red one and wave washer present) and the white spacer on the other side. Should I be concerned?

3) I modified the spring clips but the straight side appears much shorter than in your picture (FYI). This made it a big trickier to put back together but it was possible.

Will watch for your response. You and the VEX team must be crazy busy now getting ready for St. Louis.

[Gregor]

Originally Posted by marccenter

Will watch for your response. You and the VEX team must be crazy busy now getting ready for St. Louis.

And Vex Worlds which start tomorrow.

[Paul Copioli]

Mark,

The white spacers are used for axial tolerance stack up (in addition to the wave washer). Base on the housing, case, and rotor tolerances there could be 0, 1, 2, or 3 total washers. The majority of the motors have 2 or 3 washers but you should not be concerned if you have less.

Paul


P.S. - And, yes we are a bit crazy over here as my entire staff (save one customer support person) is in Anaheim preparing for the VEX World Championships. Doors open today at 1pm to over 700 middle school, high school, and College teams.