Wayne,
Is your question in response to AMS-S-13165 being superseded by AMS-2430?
If so, I have to ask where does AMS-S-16165 say manual peening is allowed?
AMS-S-13165
Section 3.2 Equipment
3.2.1 Automatic shot peening:
The machine used for shot peening shall provide means for propelling shot by air pressure or centrifugal force against the work, and mechanical means for moving the work through the shot stream or moving the shot stream through the work in either translation or rotation, or both, as required. The machine shall be capable of reproducing consistently the shot peening intensities required. Except of wet glass bead peening (see 3.3.9), the equipment shall continuously remove broken or defective shot so that this shot will not be used for peening.
3.2.2 Computer-controlled shot peening:
When specified in the contract or purchase order (see 6.2 and 6.8), the machine used for shot peening shall be as in 3.2.1 and also shall be equipped with computer aided monitoring equipment. This equipment shall continuously monitor critical process parameters through interaction with a sensing system. The media shall be metered to each nozzle and wheel with the desired shot flow. Process parameters shall be as specified by the procuring activity (see 6.9. The machine shall be stopped immediately and corrective action shall be taken when any of the established process limits is violated. The electronic system used for monitoring and controlling shot peening shall include a data recording device which will mark (plot) process interruptions or inconsistencies, and shall be maintained for the purpose of providing a hard copy record.
There is no mention of manual equipment in this section.
3.3.7 Coverage:
Areas of parts shot peened in compliance with design requirements shall be peened to complete visual coverage (see 4.4.1 and 6.11). When a surface on which peening is required is obstructed and it is impossible to obtain complete visual coverage by direct impact, coverage by reflected shot is allowed. Full coverage will not be required if the part is peened only for forming or straightening. Critical applications shall be as specified by the procuring activity (see 4.2 and 6.11).
6.4 Special peening procedure:
Where a special procedure is required, applicable drawings or a contract will designate such critical areas (see 4.2).
This is where you would have to obtain approval from your customer to permit manual peening.
6.5 Additional peening:
Shielded or partially shielded areas, walls of deep recesses, or other areas less accessible to the maximum effect of the blast stream will receive less peening as to intensity and coverage than more exposed or more favorably oriented areas, and may therefore require additional peening or repositioning of the part to achieve correct peening in these areas. Use of special nozzle equipment or employment of deflector peening operations may be useful in diminishing the amount of additional peening.
This is the big one. Time and time again people at SAE AMEC meeting state they need manual peening to get to hard to reach areas and AMS-2430 does not address it. I’m not sure why but many people feel that AMS-S-13165 permits it. There is nothing in this specification that even references manual peening. I agree that there are some OEM specifications that allow it but not many.
I'm sure this is why there is no reference to manual peening in AMS-2430.
