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--- techtalk:ref:tools026 [2020/05/21 04:08]
hippysmack [Field Calibration Check]
+++ techtalk:ref:tools026 [2020/05/24 03:32] (current)
hippysmack [Field Calibration]
@@ Line 58: / Line 58: @@
     * __If the wrench clicks on the mark you made in step 2__, your wrench is within calibration.
     * __If the wrench clicks higher toward the drive end than your mark__, your wrench adds more torque than what is on the handle's set value. \\ (you are putting more torque on a bolt than the value you set on the wrench)
-    * __If the wrench clicks farther down the handle than your mark__, your wrench adds less torque than what is on the handle's set value. \\ (you are putting more torque on a bolt than the value you set on the wrench)
+    * __If the wrench clicks farther down the handle than your mark__, your wrench adds less torque than what is on the handle's set value. \\ (you are putting less torque on a bolt than the value you set on the wrench)
+The test wrench below clicked 5/16" down the handle from the set mark. \\
+The scale would have to be set to 12.518 ft/lbs to deliver 12 ft/lbs of torque to a fastener. \\
+lbs weight x 8-5/16" length (8.3125) = 149.625 in/lbs. \\
+.625 in/lbs x 0.0835 = 12.494 ft/lbs. \\
+(12.494ft/lbs + .024 ft/lbs subtracted for testing  =  12.518 needed to deliver 12 ft/lbs)
+So in theory, with the test wrench set to deliver 12 ft/lbs of torque, it would have only delivered 11.482 ft/lbs of torque. \\
+... Or, maybe the fish scale is out of calibration and the wrench is right. \\
 |  Pick your weight ((photo by Hippysmack))  |  Set the wrench level in a vise  ((photo by Hippysmack))  |
@@ Line 70: / Line 79: @@
+As a double check, more weight was added to test the wrench at a higher torque value of 22 ft/lbs. \\
+The results were about the same. App 3/8" down the wrench is where it clicked using 34 lbs. and the same 8" length.((photos by Hippysmack)) \\
+|{{:techtalk:ref:tools:torque_wrench_calibration_9_by_hippysmack.jpg?direct&300|}}|{{:techtalk:ref:tools:torque_wrench_calibration_10_by_hippysmack.jpg?direct&300|}}|{{:techtalk:ref:tools:torque_wrench_calibration_11_by_hippysmack.jpg?direct&300|}}|
+In regard to the accuracy of the weight, an in/lb clicker was tested with the 18 lb. steel block. \\
+The wrench was set at 72 in/lbs. with a 4" test length. \\
+The wrench clicked at exactly the end of the mark. \\
+So which wrench is calibrated correctly still remains to be professionally tested but the results are here for your interpretation. \\
+|  In/lb clicker wrench testing.  ||
+|{{:techtalk:ref:tools:torque_wrench_calibration_12_by_hippysmack.jpg?direct&300|}}|{{:techtalk:ref:tools:torque_wrench_calibration_13_by_hippysmack.jpg?direct&300|}}|
+\\
+====== Field Calibration ======
+Again, there is nothing scientific about this procedure. But it will get you close using the calibration check above. \\
+If the internal spring has been compromised, the procedure below will not fix the problem. \\
+The spring spreads the load over the entire wrench's torque scale. \\
+So adjusting the tension on the low end will still throw off the torque on the mid to higher end if the spring is no longer functioning properly. \\
+The procedure below is a simple adjustment to correct a situation where the end nut has been allowed to turn and change the tension. \\
+This just helps to change the tension back. Some have used this procedure and seem to like it. \\
+Use the information at your own risk. \\
+  - **Turn the adjusting sleeve down to the lowest setting**.
+  - **Remove the nut on the end of the handle**.
+  - **Adjust the tension on the handle sleeve**.
+    * Basically this sets the point at which tension begins in relation to the handle sleeve.
+    * Hold the sleeve with one hand and turn the threaded bushing on the end clockwise or counterclockwise to adjust the the click point. \\ (you may have to turn the lock screw on the end periodically to keep it loose)
+  - **After you've turned the bushing in/out a little, turn the sleeve to the test setting**.
+    * The bushing should turn with the sleeve with the threads not moving in the sleeve.
+  - **Perform the calibration check above to see where the wrench clicks now**.
+  - **Repeat this calibration procedure until you get the wrench to click on the length mark as in the test check above**.
+  - **Once done, install the nut on the end**.
+    *  Be careful not to allow the end nut to turn the bushing in the sleeve while tightening. \\ That would change wrench calibration.
+  - **Once the wrench is back together, bushing tight, do a final calibration check**.
+    * Tightening the nut on the end can throw calibration off. It just needs to be tight enough stay put.
+{{:techtalk:ref:tools:torque_wrench_calibration_15_by_hippysmack.jpg?direct&300|}} ((photo by Hippysmack)) {{:techtalk:ref:tools:torque_wrench_calibration_16_by_hippysmack.jpg?direct&300|}} ((photo by Hippysmack)) {{:techtalk:ref:tools:torque_wrench_calibration_17_by_hippysmack.jpg?direct&300|}} ((photo by Hippysmack)) \\
+On the test wrench, the bushing was turned clockwise originally and the wrench clicked even farther toward the handle end once tested. \\
+Subsequent adjustments and tests with the bushing turned counterclockwise put the test wrench back into calibration (as well as this test will do anyway).
+{{:techtalk:ref:tools:torque_wrench_calibration_18_by_hippysmack.jpg?direct&300|}} ((photo by Hippysmack)){{:techtalk:ref:tools:torque_wrench_calibration_19_by_hippysmack.jpg?direct&300|}} ((photo by Hippysmack)){{:techtalk:ref:tools:torque_wrench_calibration_20_by_hippysmack.jpg?direct&300|}} ((photo by Hippysmack)) \\
+**Related videos:** \\
+  * [[https://www.youtube.com/watch?v=8HGO9Vv9eDE|Torque Wrench Stopped Clicking FIX and Calibration]]
+  * [[https://www.youtube.com/watch?v=XaqBA-xSGbc|Calibrate a Torque Wrench with a $5 Luggage Scale]]

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