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Magtrol torque meters provide dynamic
torque and speed measurement of:
- Propellers - aerospace, marine and helicopter
- Windshield wipers, electrical windows, starters,
generators and brakes in automobile industry
- Pumps - water and oil
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- Reduction gears and gearboxes
- Clutches
- Motorized valves
- Drills, pneumatic tools and
other machine tools
- Tachometers
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Torque Limiter Testing
on Drills
A large manufacturer of hand drills was in need of a test
bench for testing the torque limiters of their drills. The
aim of the test bench was to equip their repair shops with
a versatile, easy and fast system capable of testing a wide
range of repaired drills. The ideal test bench would be a
stable setup with a maximum surface area of 800 × 800 mm,
capable of measuring speed of rotation and maximum trip torque
for a 5-200 Nm range of drills. The test cycle would include
machine assembly, rotation at nominal speed and braking the
machine until the torque limiter trips within a total test
time of 3 minutes maximum per drill.
Magtrol SA was able to meet these expectations with the development
of the BRP 125 Test Bench, using their TM 211 Torque Transducer
along with a disc brake, coupling, swivel and universal joint.
The drill is placed on the test bench and connected to the
system with a quick male/female coupling, held by hand by
the operator. A stop bar prevents the machine from turning
on. The torque is transmitted by means of a Cardan (universal
joint) and a swivel joint. The role of transmission by Cardan
and swivel joint is to allow the test without having to align
and fix the machine. Once the maximum speed is reached, the
drill is braked by means of the disc brake controlled by an
electropneumatic control.
The system is controlled by software that allows the user
to save the test parameters and print out a test certificate
for each drill tested. The certificate contains information
on the type of drill, serial number, nominal speed, nominal
torque, name of tester, date of the test and the test values,
which are also output in a torque/speed diagram.
Since the TM 211 Torque Transducer is particularly suited
to measurements of great accuracy in fairly large ranges,
the BRP 125 Test Bench has been a success with great reliability,
good mechanical stability and an excellent reproducibility
(0.5%). The users are very satisfied with the performance
and functionality of the bench.
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