Controller For DC
Electronic Fastening
The Kappa controller verifies that the correct number of dc
electronic fasteners is installed to specification. It measures torque
and compares it to quality limits, whereas other methods (using current)
only estimate torque. The Kappa controller is compatible with the full
range of QPM dc electric tools, from 0.6 to 2,000 Nm and higher. A
single dc electric tool can be set-up to assemble joints of different
target torque levels -- unlike air tools, which require separate tools
for each torque level. Kappa features include a large display with
softkey navigation, a parameter wizard to ease setup, and embedded
toolbox software that runs on a Web browser and lets users analyze
tightening results fed from the controller.
Direct-Acting Solenoid
Valves
The 10 and 15-mm direct-acting solenoid-valves come in two or
three-way configurations as normally open or normally closed. Available
flow rates are 0.5 to 3.0 scfm depending on the orifice size. Features
include a highly visible LED indicator and manual override, quick
response time, and multiple mounting and voltage options.
Heavy-Duty Shaft Encoder
The RHDi, heavy-duty incremental shaft encoder uses precision
bearings, metal code disks, proprietary custom LEDs, and custom
Opto-ASIC circuitry. It comes with standard2.6-in.-square mounting
flange, and operates in temperature from -30 to 100°C. When
equipped with a steel shaft, the encoder meets NEMA-3, 13, and IP54
requirements.
Coming
to grips with compliance
Q. The single issue that causes the most discussion during our
motor-sizing process is compliance and stiffness. Is there a typical way
of allowing for compliance?
A. When properly sizing a motor, we use a very simple equation: Tpk = a
X Jt. This equation tells us the amount of peak torque (Tpk; lb-ft)
needed to accelerate a load to a given speed, for a specified
acceleration rate (a; ft/sec2), for the total inertia (Jt; lb-ft2) of
the system. However, this equation will not explain how the load will
react or perform during acceleration. And compliance is the real beast
that will reduce system performance.
What's
a mechatronics technician?
When Keith Campbell muses about industrial education, his thoughts go
back to his uncle Ralph. After graduating first in his high-school
class, Ralph got a job as a machinist. He spent a long and satisfying
career working in factories with no regrets.
The question that bugs Campbell is this: What if his valedictorian uncle
had graduated high school today? "Ralph probably have gone to a
four-year college and, if he was lucky, eventually run a McDonald's,"
Campbell shrugs.
