J Head Nozzle

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J-Head Nozzle

Release status: experimental

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Description
J-Head Nozzle and Thermal Barrier Based on a combination of ideas from the Makerbot Mk 5 hot end, The Inline Heater Variation, some ideas from Brian Briggs, as well as myself.
License
GPL
Author
Contributors
Based-on
Categories
CAD Models
External Link


Introduction

UNDER CONSTRUCTION


More information coming soon.

Bill of materials

Quantity Part Description
1 Brass J-Head Nozzle Machined Brass Nozzle/Heater Combination
1 PEEK Insulator Machined PEEK Insulator
1 PTFE liner 1/8" ID, 1/4" OD PTFE tubing
1 Heater Resistor (coming soon)
1 Support Washer Optional 1/2" Fender Washer


Machined parts

More information coming soon

J-Head Nozzle

Thermal Barrier

Machining

More information coming soon

J-Head Nozzle

  1. Find the center of the axis of the nozzle. This can be done by various means ranging from using a milling machine to using marking fluid, a height gauge, and a surface plate.
  2. Mount the 5/8" brass bar stock in a 4-jaw chuck on a lathe. Adjust the chuck so that the nozzle axis is on center.
  3. Turn the threaded end of the nozzle down to 0.375 +0.000 -0.004.
  4. Thread the nozzle to 3/8-24 up to the shoulder of the heater section.
  5. Drill out the center of the nozzle.
  6. Turn off the last 2 to 3 threads at the end of the nozzle and cleanup the threads.
  7. Remove the work piece and mount it by the threaded end so that the threaded end is centered in the lathe.
  8. Machine the nozzle tip to the desired profile.
  9. Drill the nozzle orifice.
  10. Mount the nozzle in a milling machine and mill off the excess material in the heater section.
  11. Drill out the holes for heater resistor and thermistor.

Thermal Barrier

  1. Cut a piece of PEEK to length.
  2. Drill out the PEEK to within ___ of the end using a ____ drill bit.
  3. Using a ___ drill bit, drill out the end to a depth of 0.550.
  4. Internally thread the end to 3/8-24 using a bottom tap.
  5. On the end, turn a 0.500 -0.000 +0.003 shoulder for a distance of approximately 0.050. This is to center the optional support washer.
  6. Remove the PEEK thermal barrier and reverse the ends in order to machine the opposite end.
  7. Using a 60 degree center drill, or other means, drill a tapered filament entrance in the end.
  8. Finish the thermal barrier by drilling out the end to 3.1mm.

Assembly

Notes

See also: Extruder Nozzle Variations