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Sub-assemblies

  1. Motor

    • 5/16", 1/4" hex key

    • Epoxy
    • Gorilla glue/polyurethane (PU) glue
    • Room temperature vulcanizer (RTV)
    • Adjustable spanner
    1. Assemble the nozzle. Add o-rings and lubricate well.
    2. Follow the 'MIT Rocket Team Grain Cutting and Bonding Procedure' to bond the grains to the liner, using the nozzle assembly as a placement guide. Apply Gorilla glue to the splice, if any.
    3. Bolt the nozzle assembly to the case, taking account of directionality.
    4. Slide the motor load into the case.
    5. Use RTV to attach the insulation disk to the forward closure. 
    6. Attach the pressure transducer to the forward closure.
    7. Add o-rings to the forward closure and lubricate generously. Slide the closure into the open end to the case.
    8. Bolt the forward retention ring to the case.

  2. Piston

    Materials

     

    • 1/4 in torque wrench

    • Integrated Firebolt
    • Multimeter
    • Teflon tape
    • 1/4 NPT plug 
    • Safety goggles
    • Gloves
    • Scale
    • Weigh boats 
    • Popsicle sticks
    • Elbow joint
    • Tee fitting
    • Adjustable wrench
    • Vice grip/pliers
    • Plug

    Procedures

    1. Using a 1/4 inch torque wrench, ensure that the bolts holding the piston together are very very tight. If the bolts are loose, the piston will lose pressure as it extends. (torque wrench adapter in piston box)

    2. Use multimeter to check continuity of Firebolt (should be about 1.0-1.4 ohms) and twist the wires to short it. Two people should visually confirm that it is shorted. Wrap the Firebolt with five wraps of Teflon tape. Use pliers to screw firebolt into the NPT plug.

    3. Everyone put on safety glasses. From now on, everyone within the vicinity of the pyrotechnics must wear safety glasses.

    4. Measure out the appropriate amount of black powder into a weigh boat (will vary over testing matrix) and pour it into the other side of the plug, holding over a weigh boat. Seal the opening by wrapping over the head and opening three times with Teflon tape.

    5. Repeat steps a-d

    6. Compress the piston completely!

    7. Screw an elbow joint into a side female end of the tee after adding Teflon tape.

    8. Wrench the elbow and tee assembly into the inlet hole of the piston with 5 wraps of Teflon tape until extremely tight and turned upright.

    9. Put the 2 assembled plugs into two remained female ends of tee fitting

    10. Clock the tee fitting close to the body of the piston so the piston fits better into AV bay

    11. Log Firebolts

  3. Payload - NC

     

    Hermes II Payload - NC Assemblage Procedures


  4. AV Tower

  5. Soft Goods


  6. Lower Electronics

    1. Place o-rings on the forward closure
    2. Bolt load cell to plate, checking that screw head does not poke out

    3. Screw in the 1/2" eyebolt into the S-shaped load cell and castlenut, with washers on both sides of load cell. 

    4. Tighten with a wrench and insert cotter pin. Spread the legs of the pin.
    5. Screw the load cell into the forward closure
    6. Slide the forward closure into the forward retention ring (some manual encouragement may be needed)
    7. Hook up electronics

    Tools:
    5/16 hex key

    Needle nose pliers 

    1/4 hex key with ball tip

    Vise

     

  7. MP Assembly

    Hermes II Mission Package Assemblage Procedures

Integration Order

Ideally, the piston, AV tower, and payload stack can be assembled in parallel and then each attached to the payload bulkhead. In parallel to this assemblage, the nosecone and mystery box can be integrated. Then the two groups would be integrated together with the soft goods and the fin can.

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