Hangout notes: 8/23/12 9:57 PM

Mach 30 Hangout - Aug 23, 2012

More Work on Shepard

Ethan had used drawer slide rails on a similar project.
J went to Home Depot to get the ball-bearing drawer rail. It was around $11 or $12 for a pair. With a static test like Shepard’s inertia and friction don’t play as much of a role.
J went to hobby shop and got the motors, adapters, and parts for Estes motors.
Purchased a copper plumbing T to handle ejection charge.
J is going to build up plywood mount with grooves that the motor with the T will mount to that and then that will mount to the drawer rail.
Blaze mentioned a 3D printer being purchased by Juice labs.
Ethan - My recommendation on the test stand for a structural test if I may.

It can also be used for load cell calibration.
We put a pulley on the front of our rail and hung weights off of it.
The string went to the motor mount to put a load on it.
From there, you could then know what 1,5,10 lbs of thrust looked like.
And you could also load it up to see when the test stand would fail.
10 lbs force from gravity = 10 lbs thrust force.
When we did it in DBF, the motors were mounted to a firewall.
Which was on the sled attached to the rail.
The sled was retained by a bolt that ran in the direction of movement and attached to a load cell to get thrust.
So for our pulley test, we just ran the rope from the firewall out ahead of the firewall.
And over a pulley at the head of the rail.
The rope hung straight down and had the weights mounted.
Ethan posted a sketch.

J - Has been pushing for Agile design for awhile.
Jeremy - Updated Blaze on the DAQ side of things and Blaze has now joined in on testing the Force Sensing Resistor.
J wants to pull the trigger on thermocouple hardware in case of supplier issues.

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