CAUTION: DO NOT USE ELECTRIC ARC SCRIBE, VIBRATING TOOL OR PENCIL GRINDER TO MARK ROTATING PARTS.
(b)
Electric arc scribe, vibrating tool or pencil grinder-Adaptable for identification of castings, forging and anodized items prior to anodizing.
(c)
Mechanical stamp, shallow or deep-Adaptable for nonfunctional surfaces.
1 Minimum thickness of aluminum sheet is 0.032 inch (0,8128 mm) and minimum steel thickness is 0.025 inch (0,635 mm).
2 Must be done prior to any surface treatment.
3 Do not use for marking 2014, 2024, 7075 aluminum or magnesium sheet, plastic, tubing, sheet metal parts of pressure systems, metal harder than 34 HRC, nitrided or case hardened parts.
15. Repairing Damaged/Oversized Diameters NOTE: See Method No. 407A, 407B, and 407C for repair of loose or damaged inserts.
A. Method No. 415A: Sleeve With Same Material
NOTE: The wall thickness on both sleeve and housing shall not be less than 0.050 inch at thinnest point after final machining. Inside corner radius shall be 0.015 to 0.040 R, or no less than minimum radius called out on nonconforming diameter being repaired.
For oil transfer tube diameters and other O-ring bores, a minimum sleeve thickness of
0.030 inch may be used.
Repair Page 464 Apr 1/05
20-00-02/70-00-01
(1)
Machine the nonconforming diameter oversize for a like material sleeve.
(2)
Machine a sleeve of like material and hardness 0.0005 inch minimum press fit per each
1.0 inch of diameter as required.
NOTE: Sleeve shall be of design to provide reservoir for bonding agent; a 0.005 inch groove is typical. Also, machine anti-rotation pins as required, 0.060 minimum diameter X 1/8 inch minimum length. Use like material or better. (See Figure 409).
(3)
Deburr sleeve and housing and touch up rework area sleeve and housing (Dow 1 or 19. in accordance with product specification; chromate conversion coat in accordance with MIL-C-5541-aluminum).
(4)
Visually inspect steps (1) through (3).
(5)
lnstall sleeve to proper depth.
CAUTION: WHEN DRILLING FOR THE ANTI-ROTATION PIN DO NOT BREAK THROUGH SIDE OF CASTING OR INTO CORE PASSAGES.
(6)
If anti-rotation pin used, drill and ream 0.0005 inch minimum press fit for anti-rotation pin where possible and into heaviest part of casting. (See Figure 409).
(7)
Remachine to manual requirements, make sure that no oil or fuel passages and intersecting holes are blocked.
(8)
Deburr rework area.
(9)
Where applicable, pressure test rework area per manual requirements.
(10)
Pressure flush and back flush to clean.
(11)
Touch up bare metal at rework area (Dow 1 or 19. in accordance with product specification; chromate conversion coat in accordance with MIL-C-5541 aluminum).
(12)
Visually Inspect.
NOTE: Make sure all passages are open.
(13)
Nondestructive test as required by manual.
Repair Page 465 Apr 1/05
20-00-02/70-00-01
Repair of Damaged/Oversized Diameter
Figure 409
Repair
20-00-02/70-00-01
B. Method No. 415B: Oversize Steel Liners NOTE: If standard oversize details are not available, proceed with step (2).
(1)
Applicable only when standard 0.010 to 0.020 inch oversize sleeves or liners are stocked and available. Machine the nonconforming diameter oversize in 0.010 inch increments, to
0.020 inch maximum oversize condition if necessary to true up. All other features are to meet drawing requirements.
(2)
Reference step (2) if standard oversize sleeves are not available. Machine the nonconforming diameter oversize (minimum stock removal) to 0.40 inch maximum oversize condition to true up.
中国航空网 www.aero.cn
航空翻译 www.aviation.cn
本文链接地址：标准施工手册 STANDARD PRACTICES MANUAL 20-00-02/70-00-01(95)
