Checkline TSC User Manual

TSC (Cam-Over Wrench) Operating Instructions

Rev 1.0

Calibrating Torque Wrenches

To calibrate torque wrenches either use a torque analyzer or torque
transducer within the range of the torque wrench. For cam-over torque
wrenches calibrate torque in “Peak” mode with an analyzer or
transducer. Make sure to apply the torque slowly and smoothly.

Scale

1. Select a torque analyzer or transducer that covers the torque range
of the TSC wrench. Connect wrench to the torque analyzer or transducer.

2. Using micrometer scale, set wrench to 20% full scale setting. Apply torque CW slowly
until wrench 'slips' and note reading from test device.

3. Repeat step 2 for 60% and 100% tool settings (other test points can be used if desired.)

4. If readings are not within the specification tolerance, then perform calibration adjustments
as described below.

5. Recalibrate torque wrench at prescribed intervals.

Note: Refer to ISO6789 International Standard for more information on hand tool testing
requirements.

Calibration Adjustments

1. Test tool through full range. Make scale adjustments, if required, as described in steps 2 - 5. If wrench is nonlinear, contact
Mountz for technical repair service.

2. Adjust tool to 20% full scale setting. Remove set screw and locking knob at end of handle

3. Peel back rubber grip and loosen 3 set screws to remove handle adjusting sleeve.

4. Turn exposed torque adjustment screw CW to increase torque and CCW to decrease torque to proper setting. Test tool on
torque analyzer to ensure correct adjustment to 20% setting was made. Repeat as necessary.

5. Replace adjusting sleeve onto tool ensuring to align zero micrometer scale. Lock 3 set screws, replace locking knob and
tighten set screw. Replace rubber grip.

Torque Adjustment
Knob

Setting and Applying Torque

1. Set desired torque on the scale. Pull down on the "Adjustment Knob" and turn knob clockwise to increase torque and
counter clockwise to decrease torque on the scale. Align the desired torque value on the micrometer scale. Release
"Adjustment Knob."

2. Tighten nut or bolt by applying steady twists. Wrench should be kept at 90 degrees to axis of bolt during tightening.
When pre-set torque is reached, the wrench will 'slip.'

3. The wrench will automatically reset itself for the next application.

4. With its unique cam-over design, it's impossible to over tighten beyond the preset
load.

TSC Wrenches - All Models

Re-calibration Procedure

Test Methods:

As adopted and stipulated by Mountz, and in accordance with ISO 6789 recommendations for
the testing of TSC Wrenches

1. Testing should be done at normal ambient temperature of 20ºC ± 5ºC after a period of
stabilisation and with the tool being maintained within this temperature band throughout the
test.

2. A good quality Electronic Torque Analyser should be used for testing with an accuracy of
±0.25% of reading ±1 LSD (Least Significant Digit).

3. The Transducer should be mounted with its axis in a vertical position.

4. The Torque Analyser should have a “Peak Hold” facility, as it is impossible to read the
maximum torque achieved in “Track Mode”. (It should be remembered that it is impossible
to over-torque with TSC/P’s and similar cam-over mechanism wrenches unlike “Clicker”
wrenches that become solid levers after achieving the pre-set torque value).

5. Under test, the wrench should be operated without pauses to give a slow, consistent and
smooth action.

It should be realised that currently all Electronic Torque Analyser manufacturer’s quoted
accuracies refer to results obtained during Static testing. In practice most torque tool testing
is done Dynamically using Transducers - for which there are no dynamic Calibration
Standards at present.

It is also known that Electronic Torque Analysers with differing sampling/response rates will
provide differing torque readings for the same tool at the same setting!

Procedure:

1. Peel back the rubber hand grip from the end of the tool to reveal the three equally spaced
socket set screws located in the adjusting sleeve.

2. Ensure that the red lock knob is pulled fully out and engage the tool with the test device.