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Inspection criteria for AS-HE0016 and AS-HE0017
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Description

We are missing inspection documentation for the pre-assembled dual v3 hotends. Some things I think would be worth inspecting are:

  • are the thermistor crimps soldered
  • thermistor cut and strip lengths and tolerances
  • electrical specs and tolerances of both thermistor and heater
  • dimensional specs and tolerances (nozzle diameter, heatbrake OD and bore diameter)
  • hot tighten -- is it actually tight? (we have too many that are not even tight and can be loosened with just thumb and finger).

Event Timeline

kent created this task.Feb 19 2018, 2:16 PM
kent triaged this task as Normal priority.
kent updated the task description. (Show Details)Feb 19 2018, 3:02 PM
kent added a subscriber: stan.Feb 20 2018, 11:04 AM

related information coorolated to the post description

  • are the thermistor crimps soldered

will a "lot" inspection of this component be sufficient? to validate, the connector housing must be removed from each for confirmation purposes.

  • thermistor cut and strip lengths and tolerances

standard

  • electrical specs and tolerances of both thermistor and heater

thermistor:
Part No. 104GT-2 | R=100.0kΩ±3% (25°C) | B=4267K±2%


heater cartridge:
E-Heater-24V-25W | Min: 17.5Ω | Max: 21.3Ω

  • dimensional specs and tolerances (nozzle diameter, heatbrake OD and bore diameter)

standard

  • hot tighten -- is it actually tight? (we have too many that are not even tight and can be loosened with just thumb and finger).

Hot tightening cycle description from E3D-Online information: “You want to aim for 3Nm of torque on the hot nozzle—this is about as much pressure as you can apply with one finger on a small spanner.” - (3Nm=26.55lbf.in)

  • dimensional specs and tolerances (nozzle diameter, heatbrake OD and bore diameter)

Do we have data on these items on what we have seen, what has been deemed acceptable or unacceptable in the past, or what a typical tolerance for such things would be?

stan added a comment.EditedFeb 22 2018, 2:53 PM

All the NCM reported in the E3D folder are from MER, minus the last two which only reference issues with crimps and tightness. I see several reports stating in one fashion or another that the heat break was "loose" in the heater block. It may be a thread spec issue? @kent, do you have any tracked information as to the cause of the nonconforming specifics?

I have put together a applied inspection criteria for the E3D hot-ends compiled from documents for the five current E3D tool-heads: AS-HE0016, AS-HE0017, AS-HE0020, AS-HE0021, & HE-SH0047


This information is the known criteria that is viable for referencing a non-conforming part. QC will utilize this information until a finalized spec can fulfill this discussion's description's intent.

AOJAS added a subscriber: AOJAS.Mar 12 2018, 12:53 PM
This comment was removed by AOJAS.