Team Update #11

[EricH]

Update #11 is out and located here. The expected withholding allowance edit, a note on Bag-and-Tag events, and a surprise edit concerning the relief valve.

[viperred396]

Here it is
http://www.usfirst.org/uploadedFiles...pdate%2011.pdf


I find it amusing how they did the 65 lbs withholding with bills blog and Aidan's Comment

[Daniel_LaFleur]

Originally Posted by EricH

and a surprise edit concerning the relief valve.

Maybe they are reading CD?

[IBdrummer]

Originally Posted by Daniel_LaFleur

Maybe they are reading CD?

I thought that thread mentioned a Q&A post in it.

[eugenebrooks]

Is the withholding allowance PARTS, or completed MECHANISM?

My reading of the rules, and consistency with past rules, leans
towards PARTS, but it is not entirely clear this year.

Eugene

[EricH]

The Withholding allowance is composed of FABRICATED ITEMS.

[Dancin103]

Originally Posted by eugenebrooks

Is the withholding allowance PARTS, or completed MECHANISM?

My reading of the rules, and consistency with past rules, leans
towards PARTS, but it is not entirely clear this year.

Eugene

Fabricated Items.

[sanddrag]

Required for all teams, regardless of if their using LabVIEW for programming because it also updates the cRIO image.

*they're

[Al Skierkiewicz]

Please note the updated software links for Labview and Driver's station as well as the link to NI's known issues list.

Please also note the reference to the pressure relief valve. Teams have reported that the relief valve as shipped is not set to trip at 125 psi.

"<R77> The relief valve must be attached directly to the compressor. If the relief valve is already set to 125psi, teams are not allowed to adjust it. If the relief valve is not set to 125psi, teams are required to adjust to release air at 125psi. The valve may or may not have been calibrated prior to being supplied to teams."

If you are using pneumatics on your robot this year, be prepared to check the operation of this component.

[Arefin Bari]

Cool. I will just keep the whole chassis back. =)

[Jim E]

Hi Arefin,

How many snow days did BCS have this build season? I know it was cold, but...

Jim Ehle

[Arefin Bari]

Originally Posted by Jim E

Hi Arefin,

How many snow days did BCS have this build season? I know it was cold, but...

Jim Ehle

We had 4 weeks of snow... (well snowish for a floridian). =)

[rsisk]

What is the best way to test the pressure relief valve is calibrated correctly for 125psi?

[Daniel_LaFleur]

Originally Posted by rsisk

What is the best way to test the pressure relief valve is calibrated correctly for 125psi?

Hook up the pneumatic system with just the compressor hooked to the pressure relief valve, a dump valve (manual) and a pressure gage.

power the compressor from a battery (use a fused line for safety). Bring the pressure to ~130 PSI. The relief valve should release pressure when it hits ~125 PSI.

If it doesn't then adjust the valve to release and then retry (poppit valves are notorious for not being very stable nor re-seating very well).

[Peter Matteson]

Originally Posted by Daniel_LaFleur

Hook up the pneumatic system with just the compressor hooked to the pressure relief valve, a dump valve (manual) and a pressure gage.

power the compressor from a battery (use a fused line for safety). Bring the pressure to ~130 PSI. The relief valve should release pressure when it hits ~125 PSI.

If it doesn't then adjust the valve to release and then retry (poppit valves are notorious for not being very stable nor re-seating very well).

An FYI for everyone who tests this way. The reseating pressure of the valve is usually 10-20% below the release pressure. After you make your adjustments vent the sytem, then represurize for the next test to verify you actually are at the set point and not significantly below it.

Also hysterisis on the spring will mean your valve could pop +/- a few psi and still completely meet the manufacturers spec. I suggest looking at this value to see what it is so you don't chase your tail on the variation.