• Created by Unknown User (mzhengxi@mit.edu), last modified by Unknown User (adamsa@mit.edu) on Jul 02, 2019 01:26

Sub-assemblies

  1. Motor

    • 5/16", 1/4" hex key

    • Epoxy
    • High temperature grease
    • Gorilla glue/polyurethane (PU) glue
    • Room temperature vulcanizer (RTV)
    • Adjustable spanner
    • Rubber Mallet
    • Boattail Allen Key**
    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 aeropoxy 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 of the case.
    8. Bolt the forward retention ring to the case.

  2. Piston

    Materials

     

    • PIston

    • 1/4 in torque wrench

    • Integrated Firebolts
    • Multimeter
    • Teflon tape
    • 2 1/4 NPT plugs 
    • Safety goggles
    • Gloves
    • Weigh boats 
    • Popsicle sticks
    • Elbow joint
    • Tee fitting
    • Adjustable wrench
    • Vice grip/pliers
    • Small scale

    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 and pour 0.2 g of black powder into the other side of the plug, holding over a weigh boat to catch any fallout. Seal the opening by wrapping over the head and opening three times with Teflon tape. Make sure Teflon tape is flush on the inside.

    5. Repeat steps b-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. Test the piston by pulling up rod for 5 secs and seeing it it is sealed
    12. Log Firebolts

Nosecone Tip Procedure

Procedures

    1. put bolt through washers
    2. put thermocouples through washers
    3. twist both sides of wires (wrap around bolts and thermocouples around themselves
    4. stick into NC to the end, pull themocouples through small end. Shift around to place washers flat inside
    5. put nosecone tip in
    6. stick a long arm in and twist the bolt into hole

  1. Payload - NC

    Hermes II Payload - NC Assembly Procedures

  2. AV Tower

  3. Soft Goods


  4. Lower Electronics

     


  5. MP Assembly

    Hermes II Mission Package Assembly 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.

  • No labels