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Conditions for approval required by: Julien Gauther
Certification of Aerospace Products to international quality Standards
Certification of Aerospace Products to international quality Standards
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EN3038D050028R:
Micrography: Could you please give the maximum depth of crevice visible on crest of thread?
Thread profile and dimension shall be in accordance with ISO 5855-2. Except the thread major diameter “d max.” which shall be equal to D1 min – 0,025.
Thus, major diameter = 5 – 0,022 – 0,025 = 4,953 mm.
Could you please fix this in FAIR? Hopefully, actual value is 4,917 mm.
EN3038D050066R:
Thread profile and dimension shall be in accordance with ISO 5855-2. Except the thread major diameter “d max.” which shall be equal to D1 min. ? 0,025.
Thus, major diameter = 5 – 0,022 – 0,025 = 4,953 mm.
Could you please fix this in FAIR? Hopefully, actual value is 4,89 mm.
EN3038D070040R:
Thread profile and dimension shall be in accordance with ISO 5855-2. Except the thread major diameter “d max.” which shall be equal to D1 min. ? 0,025.
Thus, major diameter = 7 – 0,028 – 0,025 = 6,947 mm.
Could you please fix this in FAIR? Hopefully, actual value is 6,91 mm.
EN3038D070066R:
Thread profile and dimension shall be in accordance with ISO 5855-2. Except the thread major diameter “d max.” which shall be equal to D1 min. ? 0,025.
Thus, major diameter = 7 – 0,028 – 0,025 = 6,947 mm.
Could you please fix this in FAIR? Hopefully, actual value is 6,896 mm.
Many thanks in advance
Best regards
Julien
EN3038D050028R:
Micrography:
The ISO 8168 technical specification includes ‘maximum permissible discontinuity: 20 % of basic thread depth (see Table 9)’. Since our pitch is 0,8, it allows discontinuities up to 0,09. Our result is 0,012.
You cand find the micrography thread photo and FAI FORM3(dmax corrected) attached.
Best regards
Hi Julien,
During my audit, I observed many samples under the microscope, whilst I did observe some crest laps, they were all within specified limits.
Thanks
Marko
Dear Marko, dear Sena Nur,
Fine for me now, thanks for your speed and detailed answers. Just for information/improvement, it is possible to let initial minimum tolerance of major diameter (I mean 4,85 mm for MJ5 and 6,82 mm for MJ7).
Approved from my side
Best regards
Julien