Preliminary Requirements

Procedure

1. SUBTASK 72-32-51-380-001 Dress to Remove the Damage

   
   CAUTION
   TITANIUM COMPONENT - YOU MUST USE SILICON CARBIDE TYPE ABRASIVE WHEELS, STONES AND PAPERS TO DRESS, BLEND AND POLISH THIS COMPONENT. IF MECHANICAL CUTTERS ARE USED, ONLY LIGHT CUTS MUST BE MADE TO AVOID OVERHEATING THE MATERIAL.
   
   CAUTION
   TITANIUM COMPONENT - AVOID BUILD UP OF HEAT BY APPLYING ONLY GENTLE PRESSURE AND KEEPING THE TOOL SPEED AS LOW AS POSSIBLE. USE TECHNIQUES WHICH ALLOW FOR PROGRESSIVE WEAR OF THE DRESSING MEDIA TO PRESENT A CONTINUALLY FRESH CUTTING SURFACE TO THE WORK PIECE. DO NOT DWELL ON ONE AREA OF THE COMPONENT. DRESS, WHERE POSSIBLE, IN A CIRCULAR MOTION; TAKING LIGHT CUTS TO AVOID OVERHEATING.
   
   CAUTION
   TITANIUM COMPONENT - YOU MUST MAKE SURE THAT WHEN YOU REMOVE MATERIAL, BLEND AND POLISH, TO MAKE SMOOTH, THAT NO SPARKS ARE PRODUCED AND THE ADJACENT AREA IS MASKED OFF.
   
   CAUTION
   TITANIUM COMPONENT - IF THE MATERIAL SHOWS A CHANGE IN COLOR DURING DRESSING, TO DARKER THAN A LIGHT STRAW COLOR, THE COMPONENT IS TO BE REJECTED.
   
   CAUTION
   POWER BLENDING TOOLS MAY BE USED IF DAMAGED TITANIUM PART IS PERIODICALLY CHECKED FOR HEAT BUILD - UP BY TOUCHING OCCASIONALLY WITH UNGLOVED HAND. IF TITANIUM PART BECOMES TOO HOT TO TOUCH, ALLOW MATERIAL TO COOL BEFORE CONTINUING REPAIR.
   
   CAUTION
   DO NOT OPERATE WITHOUT SAFETY GOGGLES AND OTHER GUARDS EQUIPMENT. FLYING PARTICLES CAN CAUSE INJURY.

   NOTE

   Dull tools and worn or loaded abrasive equipment generate heat rapidly and should be checked frequently and replaced when necessary.

   NOTE

   Remove the minimum quantity of material necessary to remove the damage. All blends must be smooth and continuous.

   NOTE

   The surface finish of all the repaired surfaces must have the same or better quality to that of the adjacent, not damaged, areas.

   NOTE

   Keep the material removal to the minimum necessary to remove damage.

   1. Dress to remove damage.

      1. Use portable grinding equipment and CoMat 05-021 WATERPROOF SILICON CARBIDE and CoMat 05-020 WATERPROOF SILICON CARBIDE. Dress until all damage is removed.

   2. Blend dressed area and polish the blended areas.

      1. Maximum blend depth is 0.02 in. (0.50 mm) and total blend length is 3.54 in. (90.0 mm).

      2. Refer to SPM TASK 70-35-03-300-501.

      3. Use CoMat 05-075 WATERPROOF SILICON CARBIDE and CoMat 05-076 WATERPROOF SILICON CARBIDE.

      4. Polish the repaired area to give a surface finish the same as the adjacent material.

      5. Refer to Figure and Figure.

2. SUBTASK 72-32-51-110-001 Clean the Shaft

   1. Clean the repair area.

      1. Refer to SPM TASK 70-11-26-300-503.

      2. Use cleaning equipment.

3. SUBTASK 72-32-51-110-002 Do a Swab Etch

   1. Swab etch the repaired area

      1. Refer to SPM TASK 70-11-08-300-503, SUBTASK 70-11-08-300-002.

      2. Use chemical etching equipment.

4. SUBTASK 72-32-51-230-001 Crack Test

   1. Do the penetrant crack test for the repaired area

   2. Do the crack test

      1. Refer to SPM TASK 70-23-05-230-501.

      2. Make sure that there are no cracks in the repaired area.

5. SUBTASK 72-32-51-220-001 Examine the Shafts

   1. Do a visual inspection

      1. Visually examine repaired area for nicks, dents and/or scores.

      2. Use 10X magnifying glass.

      3. Refer to SPM TASK 72-32-51-200-000.

6. SUBTASK 72-32-51-350-001 Identify the Repair

   1. Make a mark VRS1369 TASK 72-32-51-300-029 on the castellation surface

      1. Refer to SPM TASK 70-09-00-400-501, SUBTASK 70-09-00-400-001.

      2. Use vibro-engraving equipment

      3. Refer to Figure.

Figure: Rotor center shaft

Rotor center shaft



Figure: Blend Repair - Damaged Thread of the Rotor Center Shaft

Blend Repair - Damaged Thread of the Rotor Center Shaft