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Drive Wheel Assembly

This section will guide the reader on how to prepare and glue the shaft-collar-asm onto drive-wheel to create drive-wheel-asm.

Prepare shaft-collar-asm

  • Install the set-screw into the shaft-collar with a 1.3mm hex driver

  • Tighten the set-screw until it nearly passes into the inner bore

Install shaft-collar-asm and drive-wheel onto shaft-alignment-jig

  • Place drive-wheel onto the shaft-alignment-jig

    • Let the 3 slotted pins help align the drive-wheel into position
    • Push the drive-wheel down firmly to ensure it is fully seated on shaft-alignment-jig

Make sure that no part of drive-wheel is touching the center post of shaft-alignment-jig

* Otherwise, something may become misaligned or unintentionally glued together
* The image below shows a `drive-wheel` with OK clearance from the center post of `shaft-alignment-jig`

  • Place shaft-collar onto the center post of shaft-alignment-jig

    • Orient shaft-collar so the set-screw is above the green soldermask on drive-wheel

  • While firmly pressing shaft-collar-asm downward, tighten the set-screw to 0.2 N/M

    Warning

    Make sure that the shaft-collar-asm does not lift up as you tighten the set-screw

    Inspect the WIP assembly for visible daylight between drive-wheel and shaft-collar-asm

    If there is a noticeable gap between these two items, adjust and retighten shaft-collar-asm as needed.

  • When the above steps are completed, the WIP assembly should match the image below -

Glue shaft-collar-asm and drive-wheel together

  • Apply LOCTITE 435 to the seam between shaft-collar-asm and drive-wheel

    • Rotate around the shaft-collar-asm while slowly dispensing glue
    • Only apply glue to the C-shaped region of drive-wheel, being sure to avoid getting glue anywhere near the set-screw

    Note

    If you accidentally dispense too much glue initially, stop and follow the note below

    • Gently swirl the shaft-aligment-jig with affixed WIP drive-wheel-asm around to spread the glue around the silver C-shaped pad
    • As usual, be sure to avoid getting glue anywhere near the set-screw

  • Allow the LOCTITE 435 to dry for 180 seconds before proceeding

  • Remove the completed drive-wheel-asm from the shaft-alignment-jig

    • Loosen the set-screw while pinching down on the shaft-collar
      • This will help to avoid unneeded stress to partially cured glue
    • Remove the drive-wheel-asm by pressing the outer-edges of shaft-collar-alignment-jig downward to actuate the jig's ejector pins

  • Allow the completed drive-wheel-asm to dry for 1 hour before using it in further processes

    • The drive-wheel-asm should sit flat on a table while it finishes drying

  • Once an hour has passed, check that the shaft-collar is glued on firmly by nudging it laterally

    • Note that the outer surface of the glue bond may remain tacky for several more hours

If the shaft-collar moved when testing the glue bond strength, scrap the drive-wheel-asm and record the wasted material

If the glue strength is OK, move the completed drive-wheel-asm to its corresponding storage bin at the feeder assembly workstation