I don't think that statistics would help us, except that it's less likely that all of them are broken. The dial type torque wrenches are usually based on the properties of a steel bar, so they usually read correctly unless they are completely broken. Having more than one might give us a 'warm and fuzzy' reason to believe them.

Are they small inch-pound types (the smaller the better)? All of the measurements will be in the 0-15 inch-pound range.


Tim, Andrew, Have either of you had a chance to look around for the rod? I really think it's in a box somewhere.



Quoting Jeremy Booth <jboo...@gmail.com>:

I think I can obtain one (maybe several) dial type torque wrenches.  I can't
speak to calibration however.  If we had several, would statistical tests be
realistic?

-Jeremy

On Sat, Jun 19, 2010 at 5:44 PM, I <kirk...@pdx.edu> wrote:

All,
I'm trying to locate a 1/8th inch diameter, 36 inch long rod used to
measure the mass moment of inertia of the rocket (or any other object that
is attached). I need this rod to measure the rocket Ixx inertia, and I have
torn my house apart trying to locate it. It was last seen over a year ago at
the last launch, and I'm hoping that it ended up at someone else's house
(Tim, Andrew, or Dave, likely; perhaps PSU).

The rod is about 36" long, made of hardened steel (spring steel), with a
1/2" bolt attached to one end. There may also be a nylon block attached to
the bolt on the end.

This particular rod is needed because it has been characterized for its
spring constant, and it is time consuming to buy a new rod and
re-characterize the properties. Further, the rod is needed for the fully
assembled rocket test on Monday night, so I won't have an opportunity to
make one on Monday.

If you have any gear that went to Brothers last year, please take a look
and see it that rod was mistakenly placed in with your gear.

In case the rod is not found, does anyone have a dial type inch-pound
torque wrench (calibrated)?

Thanks for looking....
~D



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