Rockwell Hardness Tester: Difference between revisions

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=== Procedure ===
=== Procedure ===
1) Select and install the correct indentor 
2) Place component on anvil, use a specialized anvil if needed ( eg. round stock)
3) Turn handwheel to apply the 'minor load' until needle points to indicator mark on dial. 
4) Zero out dial.
5) Depress lever to apply 'major load' , allow time to settle. 
6) Release lever
7) Read dial for hardness.  (photo example how?)


1. Select the penetrator and test block
1. Select the penetrator and test block
Line 64: Line 56:
2. Set up the tester
2. Set up the tester


Secure the penetrator and the appropriate anvil in the tester. Check the position of the indicator hand. It should rest directly on the dot on the indicator dial. If it doesn’t, adjust the dial by turning the bezel to locate the dot under the pointer.
Secure the penetrator and the appropriate anvil in the tester.  


3. Apply Minor Load
3. Apply Minor Load


Slowly turn the hand wheel to bring the indicator hand to the line marked “SET”. This applies minor pressure load to the penetrator.
Slowly turn the hand wheel to bring the small dial indicator hand to the line. This applies minor pressure load to the penetrator.
 
4. Set the barrel dial


Rotate the top of the barrel dial toward you until its pin rests against the upper edge of the Lucite magnifier. The upper line of the barrel’s hardness scales should be exactly aligned beneath the hairline on the magnifier. (NOTE: There is no pin on Model 1-4). These must be aligned visually.)


5. Apply Major Load
4. Apply Major Load


Turn the hand wheel only until the dial pointer rests on the major pressure load indicated by the chart.
Turn the hand wheel only until the dial pointer rests on the major pressure load indicated by the chart.
Line 82: Line 71:
Turn the hand wheel back to bring the indicator hand back to “SET” and take the reading on the barrel dial through the Lucite magnifier. Each graduation on the barrel dial indicates two points in the Rockwell scale.
Turn the hand wheel back to bring the indicator hand back to “SET” and take the reading on the barrel dial through the Lucite magnifier. Each graduation on the barrel dial indicates two points in the Rockwell scale.


6. Take the reading
5. Take the reading


Standard Tester:
Standard Tester:
Line 89: Line 78:
     With the ball penetrator, read column B (red numbers).
     With the ball penetrator, read column B (red numbers).


Superficial Tester:


    With either the diamond or ball penetrator, take your reading from the black-numbered N-T column on the barrel dial. (The difference n reading is created by the difference in penetrators: N with diamond, T with 1/16″ ball.)


NOTE: The first two or three tests may be low until the penetrator and anvil have become firmly seated.
NOTE: The first two or three tests may be low until the penetrator and anvil have become firmly seated.
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