VTC Heater Creation

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  1. Cut a 49.625 inch (50.25 inch old) length of PTFE tubing 0.6 x 1 millimeter.
  2. Use awl to ensure ends are open and round.
  3. Mark 3 inches away from end 1 and 3.625 inches away from end 2.
  4. Using STAEDTLER permanent special F slide silicone sleeve over end of tubing and clamp to table using heater coil clamp.
  5. Repeat for the other end ensuring the tubing is taut and has no bends.
  6. Cut a 63 inch length of nichrome 60, 36 GA resistance wire.
    A spool of TETEMCo RW0304 36 GA Nichrome 60 Wire behind two weights allowing the spool to turn as the wire is pulled.
    TETEMCo RW0304 36 GA Nichrome 60 Wire
  7. At each end, bend the wire back on itself 5 inches from the end.
    A wire with a clear coating bent back on itself approximately five inches laying on a worktable.
    Wiring bent back on itself approx 5 inches.
  8. Close the loop with flat tweezers.
  9. Clamp the tail end to the main length with a hemostat.
  10. Grasp the closed loop in a pin vise.
  11. Keep the doubled section straight and spin the pin vise to form a double-helix.
  12. The twisted pair must function as a continuous single conductor.
  13. Each twist should be 1-2 millimeter
    There should be no gaps between the two wires.
  14. Thread finished wire into tubing.
    A close up view of a wire inside of the tubing between a wood block and a work held by a vise grip.
    The wire in a tubing under a block held by a vise grip on a table
    A vise grip with a block of wood holding a long wire on to a worktable is stretched out and inserted into a small tubing inside of another vise grip.
    Full view of the entire length of the wire with loop under vise grip and inserted into tubing.
    Tubing held in a vise grip with finished wire threaded through leaving approximately 1 inch on the other end threaded through.
    Finished wire threaded in tubing.
    Un-twisted length should line up between marks on tubing.
  15. Place 3 inch end along line of 3 inch end of mandrel.
  16. Tape 0.125 inch away from 3 inch line
  17. At end of mandrel begin coiling counter-clockwise between mandrel grooves coil until mark on end 2. (approximately 33.5 turns)
    Coiling wire along line of 3" end of mandrel tape 0.125" away from 3" line and at end of mandrel leaving no gaps between mandrel grooves all the way to the mark on end.
    Begin coiling counter clockwise at the end of the mandrel.
  18. Tape coil to mandrel at mark 2 curve up towards top of mandrel
  19. Tape second end above coil remove tape and coil onto VTC conduit keeping it tight.
    • Both ends of the coil should now be next to each other.
  20. Tape at top of conduit to hold them in place.
  21. Use VTT heatshrink sizer(s) to pre-size heatshrink and remove creases.
    • Air can be used to easily slip heatshrink off of sizer use 0.75 inch to maintain coil shape "break free" and rotate so coil ends are just to the left of the thermocouple hole add tVTC and tLN_VTC to bundle and heat shrink in place with 1 inch heat shrink.
a wire wrapped counter clockwise around a conduit with out a top end.
Wire wrapped around a conduit, part 1
a wire wrapped around a conduit counterclockwise about 33 times with a top being inserted into the conduit.
Wire wrapped around a conduit, part 2
Wires that were wrapped around the conduit are slid up the conduit towards the top.
Wires slid up the conduit towards the top.
a conduit top coiled tightly approx 33 times and then taped at the very top to keep it from unraveling.
Coiled wire taped to conduit top.
Thermal conduit with TC-T FEP under heatshrink.
Thermal conduit with TC-T FEP under heatshrink.
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