Re: Team Update 14 (2016)
 

The million dollar question for me is regarding the CDF...

It sounds to me from reading the CDF comments in the Palmetto thread, that the CDF's were repaired around match 10-20 or so by adding a piece of steel to the under-side of each Lexan board/teeter-totter. Is that correct? Did it resolve the CDF-demolition problems at Palmetto?

I don't really see that particular fix addressed in Team Update 14... should we expect more broken CDF's in Week 1?

Re: Team Update 14 (2016)
 

The fix that was implemented at Palmetto did appear to mitigate the demolition issue. After they made the change, the CDF was in play for the rest of the event.

The CDFs are all being modified for week 1, though I don't recall the specifics on the change. I'll let you know in a few hours when we start making the change for the Lake Superior and Northern Lights regionals.

Re: Team Update 14 (2016)
 

That's the change to GE-16028 and GE-16178. A countersink in the plastic with a flat head screw was replaced with a counterbore with a button head cap screw.

A steel plate was used at Palmetto but does not appear to be the permanent solution.

Re: Team Update 14 (2016)
 

I saw that change... I don't know anything about the exact failures seen on the CDF's at Palmetto, but I have a hard time imagining that using a BHCS in a counterbore vs a flat head screw in a countersink is significant enough to prevent CDF's from breaking consistently (as the unmodified ones did at Palmetto).

Re: Team Update 14 (2016)
 

Can a mod please move posts 37, 41, 43, and 45 to a new thread on CDF revision? This topic deserves its own, separate discussion.

Re: Team Update 14 (2016)
 

Done!

Re: Team Update 14 (2016)
 

Since this thread has been split off, here's the update this is referring to: https://firstfrc.blob.core.windows.n...Updates/14.pdf

Re: CDF Discussion, post Team Update 14
 

Whatever the fix(es) were, based on the follow-up webinar for scorekeepers last night, the CDF has a permanent fix and FTAs know what they are. Beyond that I don't know as I haven't asked any FTAs.

That being said, if it's safe to post, if an FTA would be willing to post details, it would be very interesting. If not, well, those at week one, it's time to play "spot the difference".

Re: CDF Discussion, post Team Update 14
 

This is second-hand but apparently, the countersunk screws were being overtightened when the CDFs were originally assembled.
This started stress cracks in the polycarb that were then aggravated by robots smashing into them.
The damage to the CDF occurred along the stress cracks.
The counter bore replacement of the countersink seems to have eliminated the stress cracks.

Re: CDF Discussion, post Team Update 14
 

I can't confirm they were countersunk (because I wasn't paying attention to that), but I can confirm that screws overtightened in manufacturing were labeled the root cause in Myrtle Beach.

Re: CDF Discussion, post Team Update 14
 

When the only tool you have is an air-powered impact wrench, everything looks like a lug nut.

Re: CDF Discussion, post Team Update 14
 

:shudder:

Reminds me of the time (ca 1995) that I pulled on the shoulder of I-10 for a tiny little shimmy that started suddenly. By the time I came to a stop, three of the five lugs on my right front tire had sheared clean off. I was probably a few seconds from using a pine tree as a brake. I don't know what tool they used to tighten the lugs at the shop, but it obviously wasn't the right one. I never used that shop again.

Edit (especially as off-topic):
I believe they were; curious as to the connection between these two. The dealer where I had the jeep towed told me they had been over-tightened. I ran the same vehicle and wheels for another 10 years without the problem recurring.

Re: CDF Discussion, post Team Update 14
 

Were they cast aluminum wheels?

Re: CDF Discussion, post Team Update 14
 

OK. My favorite description of this years game so far!

Re: CDF Discussion, post Team Update 14
 

I expect to hear that description from the game announcer at NYC...