Drifter design

[turnerjohnson]

5 gallon bucket

with CT housing in the center

issues:

• make sure there's enough flow at both ends of niskin tubes
• protection: inside bucket
• how much to make watertight? CT assembly in watertight tube, as per OpenCTD instructions

[turnerjohnson]

6/26 update

• minimize # servo motors needed
• Nick says Bigelow friendly hardware stores are Grover's Hardware in Boothbay (Harbor?) and Ames True Value in Wiscasset
• PVC pipe, buckets, zipties/hose clamps from hardware store
• springs, stoppers from McMaster Carr

Niskin Mechanism

• DIY designs all have pin on outside, perpendicular to niskin outersurface -- hard to have perpendicular triggering mech, parallel (to niskin central axis) is easier?

[turnerjohnson]

lab meeting 6/28

More designs.pdf

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lab meeting 7/12

• presented first version of niskin trigger mech

stl: niskin trigger mech v1.stl.zip

[turnerjohnson]

design 7/19: after lab meeting 7/12? and Nick's j-bolt design

niskin trigger mech 3.stl.zip

[turnerjohnson]

7/26 redesign

• replace j bolt with printed square j-hook (no 306 marine grade stainless steel hooks 4"x1/4")
• hasten print time: made walls and floors thinner
• includes review of 3 recent nickin trigger mechs.

niskin pin 4 v2.stl.zip

[turnerjohnson]

7/26 niskin sealing design

[turnerjohnson]

7/29 considering stepper motor

• securement
• coding

Nick's idea:

[turnerjohnson]

8/5 next steps

• securing weak connection between sensor array and circuitry
• tube + duct tape?
• 3d print reversible latch?

[turnerjohnson]

8/9 more brainstorming with Bob

[turnerjohnson]

9/3 design