Trim for motors

[Daniel_LaFleur]

Originally Posted by billbo911

The pressure regulators are "relieving" regulators. That means that the low pressure side will be bled out if the pressure in that side exceeds the regulated setting.
So, use a piston to add a constant force lifting the arm. Set the regulator to the amount of force needed to balance the arm. The motor will then only be lifting the weight of the object being lifted or lowered.

This will work well, but remember that the orifice of the relieving regulator is very small. Probably on the order of .010" effective orifice size, maybe smaller. This means that while it will bleed out excess pressure, it will do so reletively (sp?) slowly.

[billbo911]

Originally Posted by Daniel_LaFleur

This will work well, but remember that the orifice of the relieving regulator is very small. Probably on the order of .010" effective orifice size, maybe smaller. This means that while it will bleed out excess pressure, it will do so reletively (sp?) slowly.

Wow, I didn't realize it was that small! You're absolutely correct, that might limit this systems usability. And, I'm certain we are not allowed to modify the regulators. I'll have to verify this against the rules.

[EDIT] Yep, can't be modified by my reading of rule <R71>

<R71>
In addition to the items included in the Kit Of Parts, pneumatic system items specifically permitted on 2009 FRC ROBOTS include the following items. All included items must be “off the shelf” pneumatic devices rated by their manufacturers for pressure of at least 125psi, and used in their original, unaltered condition (except as required for assembly with other components).

[/EDIT]