VV-C-846D
TABLE IV. Metal test strips.
Metal |
Requirement |
Copper |
ASTM B152, C11000 (electrolytic tough pitch), cold-rolled, half-hard temper |
Brass |
ASTM B36, C26000 (cartridge brass), half- hard temper and ASTM B121, C33500 (composition 2), half-hard temper |
Cast iron |
ASTM A48, class 20 |
Steel |
QQ-S-698, physical quality, cold-rolled, half- hard temper (CR half-hard No. 2 temper) |
4.4.5.2 Cutting fluid solution preparation. Prepare a solution of the cutting fluid by placing
190 mL of reagent-grade water and 10 mL of the cutting fluid in a 250-mL graduated cylinder. Stopper the graduated cylinder and invert it several times. Continue inverting the graduated cylinder until a uniform mixture is obtained. Place 50 mL of the cutting fluid solution in each of the four test tubes. Mark the fluid level on the outside of each test tube and maintain this level
by the addition of distilled water during the course of this test.
4.4.5.3 Bubble tower preparation. Fill a 500-mL bubble tower with the sodium hydroxide solution and connect the tower, through the air pressure regulator, to a source of clean, compressed air by means of the rubber tubing. Connect each length of glass tubing, by means of rubber tubing and an appropriate manifold or series of Y-tubes, to the discharge outlet of the bubble tower. Place a
screw type pinch clamp on each piece of rubber tubing leading to the glass tubes.
4.4.5.4 Test execution. Insert each glass tube to the bottom of a test tube and adjust the air flow into each tube to produce approximately one bubble per second by means of the air pressure
regulator and pinch clamps. Permit the air to bubble into the tubes at room temperature 77 °F ± 5 °F (25 °F ± 3 °C) for a period of 48 hours. At the end of the test period, remove the metal strips from the test tubes, wash the metal strips in normal hexane, and permit them to dry.
4.4.5.5 Examination of sample strips. Remove the duplicate metal strips from the bottle of normal hexane and allow them to air dry. Examine the exposed and duplicate metal strips under
5X magnification. If it is determined that any staining, pitting, or etching has occurred on the exposed strips, the sample shall be rejected.
4.4.6 Film strength. Use a Falex lubricant tester or its equal to determine film strength. The tester's V-blocks shall be made of UNS 1335 or equivalent steel and have a hardness of Rockwell C22 to C30. The tester's pins (No. 8) shall be made of UNS 3135 or equivalent steel and have a hardness of Rockwell B80 to B90. Clean the blocks and pins in hot petroleum naphtha or Stoddard solvent, rinse in reagent-grade n-hexane, dry, and insert them in the machine. Clean the cup in the same manner, then dry and fill it with diluted emulsifiable oil solution prepared by combining 190 mL of reagent-grade water and 10 mL emulsifiable oil into a 250-mL glass stoppered graduated cylinder and agitating vigorously. Place the cup on its holder and raise it to immerse the blocks and pin. Install a type m (0-4,500 lbs.) gage on the tester. Turn on the motor
7
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business