Snap-On 5000-3 - Manual (Page 36)

TORQUE CALIBRATION SYSTEM SETUP CHAPTER 4
Testing Power Tools
The dynamic torque characteristic of a power tool and the static torque applied when
using a wrench usually result in different torque readings. Spinning electric and
pneumatic motor armatures contain inertia that produces a higher torque reading than
what is actually absorbed by a practical fastener. The difference is also due to individual
fastener installation characteristics that exhibit anywhere from a gradually increasing run-
down torque, (soft-joint) to a free speed, sudden dead stop, (hard-joint). The way in
which a particular operator responds to the tool’s reaction forces can also be reflected in
the resulting torque measurements.
A joint rate simulator is required when testing a power tool to allow start-up rotation of
the tool’s armature. The simulator is experimentally adjusted to replicate the average
joint hardness of the intended work. Joint rate simulators that may be used with
transducers ranging from 50 in lb to 1000 in lb are:
• 50 in. lb. max, part number 900-0-01KIT
• 400 in. lb. max, part number 900-2-01KIT
• 1000 in. lb. max, part number 900-3-01KIT
Be sure to operate any pneumatic or electrical power tool according to the manufacturer’s
recommendations.
Non-Impact Tools
Be sure the SURETEST transducer is capable of handling the intended torque to avoid
damaging the transducer. Always operate the system with the power on.
WARNING
Do not use this equipment with the power off. Always turn on the Base Unit so the
torque values are indicated on the display.
1. To program the SURETEST Base Unit, refer to Chapter 3–Set Up and Programming to
use HIGH and LOW limit alert, data STORE, display CLEAR, printer SEND and
STATistical analysis features.
2. Press Setup (F3) then select UNIT to select the desired engineering unit of measure as
displayed on the LCD display. It is easiest to match that of the tool under test.
3. Press Setup (F3) then MODE to select TRACK mode.
4.
Adjust the power tool to the desired torque output, if possible.
5. Adjust the appropriate joint rate simulator assembly for the desired soft-hard
configuration.
6. Install the joint rate simulator onto the SURETEST transducer, as shown in Figure 4-1.
Secure the transducer set screw, if provided. Loosen the simulator load screw using the
appropriate hex or box wrench.
4-4